Статті в журналах: "Electrocardiographic data"

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Brooks, Carol Ann, Nancy Kanyok, Colin O’Rourke, and Nancy M. Albert. "Retention of Baseline Electrocardiographic Knowledge After a Blended-Learning Course." American Journal of Critical Care 25, no. 1 (January 1, 2016): 61–67. http://dx.doi.org/10.4037/ajcc2016556.

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Background Among nurses, skill retention after an electrocardiography blended-learning course is unknown. Objectives To compare 3- and 8-week electrocardiography test scores, compare scores by nurse and work characteristics and self-assessed electrocardiographic competence, and compare 1-year work retention with 3- and 8-week scores and change in scores from week 3 to week 8. Methods Data were collected on demographics, comfort with electrocardiography expectations, electrocardiography competence levels, and 1-year work retention. Correlational and comparative statistics were used in analyses. Results Of 69 nurses, 58% were somewhat comfortable with interventions for abnormal rhythms. Test scores were higher at 3 weeks than at 8 weeks: mean difference, 26%; P < .001. Scores at 8 weeks reflected intermediate skill retention and were not associated with nurse characteristics, electrocardiography background, comfort with rhythms and measurements, or 1-year work retention. Nurses with greater comfort for intervening when rhythm abnormalities occurred had higher median 8-week scores (P = .01) than did nurses with less comfort, and perceptions of electrocardiographic competence were associated with 8-week scores (r = 0.28; P = .02). Reduction in scores at 8 weeks was less severe in nurses with greater comfort at 3 weeks in measuring electrocardiographic intervals (P = .008) and applying therapeutic interventions (P = .009). Conclusions Skill retention and competence in electrocardiographic interpretation were intermediate and correlated with baseline self-assessment. Electrocardiographic interpretation, measurement, and interventions should be reinforced at the bedside.

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Selker, Harry P., Manlik Kwong, Robin Ruthazer, Sheeona Gorman, Giuliana Green, Elizabeth Patchen, James E. Udelson, et al. "An example of medical device-based projection of clinical trial enrollment: Use of electrocardiographic data to identify candidates for a trial in acute coronary syndromes." Journal of Clinical and Translational Science 2, no. 6 (December 2018): 377–83. http://dx.doi.org/10.1017/cts.2019.365.

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AbstractBackground:To identify potential participants for clinical trials, electronic health records (EHRs) are searched at potential sites. As an alternative, we investigated using medical devices used for real-time diagnostic decisions for trial enrollment.Methods:To project cohorts for a trial in acute coronary syndromes (ACS), we used electrocardiograph-based algorithms that identify ACS or ST elevation myocardial infarction (STEMI) that prompt clinicians to offer patients trial enrollment. We searched six hospitals’ electrocardiograph systems for electrocardiograms (ECGs) meeting the planned trial’s enrollment criterion: ECGs with STEMI or > 75% probability of ACS by the acute cardiac ischemia time-insensitive predictive instrument (ACI-TIPI). We revised the ACI-TIPI regression to require only data directly from the electrocardiograph, the e-ACI-TIPI using the same data used for the original ACI-TIPI (development set n = 3,453; test set n = 2,315). We also tested both on data from emergency department electrocardiographs from across the US (n = 8,556). We then used ACI-TIPI and e-ACI-TIPI to identify potential cohorts for the ACS trial and compared performance to cohorts from EHR data at the hospitals.Results:Receiver-operating characteristic (ROC) curve areas on the test set were excellent, 0.89 for ACI-TIPI and 0.84 for the e-ACI-TIPI, as was calibration. On the national electrocardiographic database, ROC areas were 0.78 and 0.69, respectively, and with very good calibration. When tested for detection of patients with > 75% ACS probability, both electrocardiograph-based methods identified eligible patients well, and better than did EHRs.Conclusion:Using data from medical devices such as electrocardiographs may provide accurate projections of available cohorts for clinical trials.

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Loukrakpam, Bidyarani, Laishram Geetanjali, O. Puinabati Luikham, and Sanjoy K. Shylla. "Electrocardiographic changes in patients with pre-eclampsia." Annals of Medical Physiology 3, no. 1 (March 22, 2019): 10–13. http://dx.doi.org/10.23921/amp.2019v3i1.26774.

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Pre-eclampsia is a hypertensive disorder of pregnancy that is associated with elevated maternal risk for cardiovascular disease. Electrocardiographic (ECG) changes in pre-eclampsia have been documented in some studies. Electrocardiography has recently emerged as a useful tool to evaluate cardiovascular complication during and after pregnancy. The present study was therefore undertaken to find out electrocardiographic changes in pre-eclamptic women, visiting Regional Institute of Medical Sciences, Manipur. The aim of this study was to determine the electrocardiographic changes in both pre-eclampsia and age matched normotensive pregnant women. In this study, 25 pregnant women (gestational age >20 weeks) with pre-eclampsia in the range of 18 to 45 years of age were recruited and compared with the equal number of age matched normotensive pregnant women. ECG parameters of pre-eclamptic women were compared with those of normotensive pregnant women. The data were then analyzed using SPSS software. Pre-eclamptic women showed significantly longer QRS (0.10±0.02 sec vs 0.09±0.05 sec), prolonged QT (0.401±0.03 sec vs 0.365±0.003sec) and QTc (457.73±37 msec vs 416.47± 25.4 msec) than control group. The study shows that electrocardiography can be used to evaluate cardiovascular risk in pre-eclamptic women.

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Popadiuk, B., and S. Holopura. "Validation of a portable ECG monitor for the diagnosis of arrhythmias in horses compared to a standard electrocardiograph." Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 22, no. 97 (May 7, 2020): 20–25. http://dx.doi.org/10.32718/nvlvet9704.

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Electrocardiography (ECG) is a main diagnostic tool for diagnostics of rhythm disturbances. Since most pathological arrhythmias are only visible during movement and exercises the registration of exercising ECG becomes a mandatory diagnostic tool for monitoring of high-performance horses. Portable ECG monitor, developed together with specialists of National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” is an electrocardiograph with telemetric data transmission system and four electrodes providing six-lead real-time ECG recordings at rest and during exercise. The objective of current study was validation of portable ECG monitor for diagnostics of arrhythmias in horses compared to a standard electrocardiograph. With this aim the ECG was performed by both devices simultaneously on animals with normal rhythm and rhythm disturbances. The ECG traces were therefore analyzed and compared. 14 horses of Ukrainian riding, Friesian, and Arabian breeds were divided in two groups: experimental one with arrhythmias, and control one with normal rhythm. ECG was performed by both devices simultaneously during rest, exercise, and post-exercise period. Electrocardiographic parameters were measured manually using on-screen calipers. Obtained data was analyzed using GraphPad Prism software by linear regression method for continuous parameters (HR, duration of QRS complex, PR, and QT intervals, and amplitude of P and S waves). For nominal parameters (rhythm, excitability, and conduction disorders) the analysis of sensitivity and specificity was performed. A total of 196 ECG records were analysed. Electrocardiographic intervals had high correlation: for HR and PR interval the correlation coefficient amounted to 0.98, for QRS complex and QT interval – to 0.97, for P and S waves – to 0.96. Among detected rhythm disturbances were physiological (second degree AV block first Mobitz type and SA block) and pathological arrhythmias (SVT and SVPCs). The sensitivity and specificity for rhythm, excitability, and conduction disorders of the portable ECG monitor compared to a standard electrocardiograph was 100 %. The portable ECG monitor allows to easily perform ECG registration during rest and exercises and to detect arrhythmias and other ECG abnormalities with accuracy, compared to a standard electrocardiograph.

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Khayrutdinova, G. M. "Left ventricle remodeling electrocardiography criteria of survival assessment in Q-wave myocardial infarction patients." Kazan medical journal 94, no. 2 (April 15, 2013): 168–75. http://dx.doi.org/10.17816/kmj1582.

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Aim. To study the survival in patients with Q-wave myocardial infarction depending on features of left ventricle remodeling on electrocardiography. Methods. 10-year overall survival and heart diseases associated survival rates depending on features of left ventricle remodeling on electrocardiography were studied in 87 patients who had survived an acute myocardial infarction with Q wave. The first group included 45 patients who fulfilled electrocardiographic criteria for left ventricle adaptive remodeling, the second group included 42 patients with electrocardiographic features of left ventricle maladaptive remodeling. The survival in both groups was estimated using the Kaplan-Meier’s curves. Results. There was a highly significant inverse relationship between age and survival rate of the patients with Q-positive myocardial infarction. 40 patients succumbed by the end of the observation period, among them - 20 (50%) due to heart diseases. 20 (50%) patients died from non-cardiac events, among them - ischaemic stroke, neoplasms and accidents (most common - alcohol intoxication, 5,8% each). Chronic heart failure was most common reason of death in both groups, and it prevailed in the group of patients with left ventricle maladaptive remodeling electrocardiographic features. According to the gained data, there were no significant differences observed in overall survival in both groups during the whole follow-up period. In assessment of survival associated with heart diseases, the differences close to the statistically significant were found. Conclusion. The comparison of the overall survival depending on left ventricle remodeling electrocardiographic features did not detect any reliable differences, while in case of heart diseases associated survival assessment differences close to the statistically significant were found.

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Vergassola, R., W. Zong, M. R. Berthold, and R. Silipo. "Knowledge-based and Data-driven Models in Arrhythmia Fuzzy Classification." Methods of Information in Medicine 40, no. 05 (2001): 397–402. http://dx.doi.org/10.1055/s-0038-1634199.

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Summary Objectives: Fuzzy rules automatically derived from a set of training examples quite often produce better classification results than fuzzy rules translated from medical knowledge. This study aims to investigate the difference in domain representation between a knowledge-based and a data-driven fuzzy system applied to an electrocardiography classification problem. Methods: For a three-class electrocardiographic arrhythmia classification task a set of fifteen fuzzy rules is derived from medical expertise on the basis of twelve electrocardiographic measures. A second set of fuzzy rules is automatically constructed on thirty-nine MIT-BIH database’s records. The performances of the two classifiers on thirteen different records are comparable and up to a certain extent complementary. The two fuzzy models are then analyzed, by using the concept of information gain to estimate the impact of each ECG measure on each fuzzy decision process. Results: Both systems rely on the beat prematurity degree and the QRS complex width and neglect the P wave existence and the ST segment features. The PR interval is not well characterized across the fuzzy medical rules while it plays an important role in the data-driven fuzzy system. The T wave area shows a higher information gain in the knowledge based decision process, and is not very much exploited by the data-driven system. Conclusions: The main difference between a human designed and a data driven ECG arrhythmia classifier is found about the PR interval and the T wave.

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Mishra, Dheerendra Kumar, and Pradeep Kumar. "Electrocardiographic changes of antidepressant medication in depressive episode." International Journal of Advances in Medicine 5, no. 3 (May 22, 2018): 505. http://dx.doi.org/10.18203/2349-3933.ijam20181409.

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Introduction: Depressive disorder is leading cause of mortality in the world, with the help of recent therapeutic strategies it is easily manageable. Antidepressant medication is the most commonly used for management of depressive disorders. Among the side effects of antidepressant, cardiovascular effects of antidepressant deserve close monitoring. Invariably, it is observed that patients undergoing antidepressant therapy are not screened for pre-existing cardiovascular diseases and more so for cardiotoxicity. Various antidepressant medications are available, with different cardiac side effects profile. Ignorance, over clinical burden, poor follow up and under evaluation of cardiovascular side effects could be attributable to an ultimate surveillance of such cases. So, this study conducted to evaluate electrocardiographic changes in therapeutic doses of antidepressant medication.Methods: An Open label-controlled study was conducted on 386 subjects to evaluate the antidepressant-induced electrocardiographic changes. Treatment seeking subjects for the depressive episode was recruited from outpatient and inpatient section of Psychiatry department after fulfilling inclusion and exclusion criteria. Data was collected on socio-demographic characteristics, and detailed pre-treatment and post-treatment clinical evaluation and electrocardiographic assessment were done.Results: Data collected and analyzed from 204 subjects, mean age of subjects taking tricyclics and SSRI (Fluoxitine) 43.6±7.5 years vs 41.5±9.6 years respectively. The study sample consists of 66% females, 33% males. Among them, 35% study subject expose to tricyclics and 65% subjects taking SSRI. 19% study subjects presented electrocardiograph changes especially tachycardia among them 55% was taking the tricyclic antidepressant. Only 10% subjects taking SSRI had post-treatment abnormal electrocardiograph changes.Conclusions: Conclusively, antidepressant form a safe therapeutic modality for the management of major depression. Its cardiovascular side effects warrant against indiscriminate use of particularly in high dose and old aged person and preexisting cardiac disease.

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Pereira, Fábio Benedito Filo Creão Garcia, Lizandra Lujan Delpupo Trivilin, and Marcia Rayssa Farias Torres. "Clinical, Epidemiological and Demographic Profile of Patients Undergoing Holter (24 h) at a Health Center in Belém do Pará: a Retrospective Study." Journal of Cardiac Arrhythmias 34, no. 1 (March 12, 2021): 1–11. http://dx.doi.org/10.24207/jca.v34i1.3419.

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Introduction: Dynamic electrocardiography by the Holter system can be divided into four major groups: evaluation of clinical manifestations related to the presence of altered heart rhythm; assessment of myocardial ischemia; risk assessment of future cardiac events; and therapeutic assessment. Objective: To identify the clinical, epidemiological and demographic profile that is associated with electrocardiographic changes in the 24-hour Holter in patients seen at the Escola do Marco Health Center in Belém do Pará, Brazil. Methods: We carried out a cross-sectional and retrospective study, with data from patients such as: clinical and electrocardiographic correlation, indications, tachyarrhythmias, bradyarrhythmias, medications in use, provenance, demographic data and behavior modification. All of the information was compiled in a standardized protocol. Results: The main electrocardiographic findings were: supraventricular and ventricular extrasystoles less than 1% (reported in 71 and 57% of patients, respectively). Conclusion: The 24-hour Holter still has an important role in the identification of patients with electrocardiographic changes. The main indications for the examination were to assess the severity of arrhythmia (32%) and palpitation to clarify (23%), and there were uncommon findings, but of great clinical importance and with statistical significance, such as almost three times more frequent nonsustained ventricular tachycardia in patients with heart failure, cardiac, symptomatic frequent extrasystole (> 3%), more frequent atrial fibrillation in the elderly and men (60%) and with underuse of anticoagulant therapy (20%) due to non-diagnosis prior to the exam, and changes in the ST segment with a tendency in patients with systemic arterial.

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Artsymovych, Agar, Olena Oshlianska, Olena Okhotnikova, Zoia Rossokha, Olena Popova, Nataliia Medvedeva, Victoriia Vershigora, Illya Chaikovsky та Olga Kryvova. "Possibilities of using determination of allelic polymorphism of interleukin-6 G174C and tumour necrosis factor-α G308A genes for the prediction of cardiovascular disorders in children with juvenile idiopathic arthritis". Pediatria i Medycyna Rodzinna 18, № 1 (31 травня 2022): 58–69. http://dx.doi.org/10.15557/pimr.2022.0008.

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Objectives: Juvenile idiopathic arthritis is a chronic disease that affects the synovial membrane of the joints, but can also lead to secondary lesions of the cardiovascular system. The most important mechanism of myocardial damage is associated with the effect of proinflammatory cytokines. The aim of the study was to propose a method of early detection of cardiovascular system changes and lesions in patients with juvenile idiopathic arthritis based on the determination of allelic polymorphism combined with electrocardiography data. Materials and methods: 102 patients with juvenile idiopathic arthritis underwent a general clinical examination. The overall activity of juvenile idiopathic arthritis was assessed using the Juvenile Arthritis Disease Activity Score. In addition, the patients underwent an electrocardiographic evaluation using the software and hardware complex “Cardioplus P,” which is a portable electrocardiograph providing “signal-averaged” electrocardiography performing the recognition and measurement of amplitude-time parameters, and calculation of secondary electrocardiography parameters. The genotypes of patients were additionally determined by alleles of the TNF-α (G308A) and IL6 (G174C) genes by polymerase chain reaction. Results: The overall number of mutations affects the course of the disease, with two or more mutations being associated with a more aggressive course of the disease, a more pronounced degree of inflammation, and a higher frequency of extra-articular lesions. The complex indicator of the functional state of the myocardium according to the electrocardiography data differed significantly (p = 0.00001) in clusters. Conclusion: Patients with juvenile idiopathic arthritis with two or more mutations in different genes of proinflammatory cytokines have a higher activity of the inflammatory process and a higher frequency of cardiovascular changes according to 4th generation electrocardiography. The determination of polymorphism may be useful in evaluating the risk of development of cardiovascular system abnormalities.

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Türe, Mehmet, Alper Akın, Edip Unal, Ahmet Kan, and Suat Savaş. "Electrocardiographic data of children with type 1 diabetes mellitus." Cardiology in the Young 32, no. 1 (November 2, 2021): 106–10. http://dx.doi.org/10.1017/s1047951121004376.

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AbstractBackground:Adult patients diagnosed with type 1 diabetes mellitus are at risk for ventricular arrhythmias and sudden cardiac death.Aim:The objective of our study is to evaluate the electrocardiographic data of children diagnosed with type 1 diabetes mellitus and to determine the possibility of arrhythmia in order to prevent sudden death.Methods:Electrocardiographic data of 60 patients diagnosed with type 1 diabetes mellitus and 86 controls, who were compatible with the patient group in terms of age and gender, were compared.Results:The duration of diabetes in our patients with type 1 diabetes mellitus was 5.23 ± 1.76 years, and the haemoglobin A1c levels were 9.63% ± 1.75%. The heart rate, QRS, QT maximum, QT dispersion, QTc minimum, QTc maximum, QTc dispersion, Tp-e maximum, Tp-e maximum/QTc maximum and the JTc were significantly higher compared to the control group. There was no significant correlation between the duration of type 1 diabetes mellitus and HbA1c levels and the electrocardiographic data.Conclusion:We attributed the lack of a significant correlation between the duration of type 1 diabetes mellitus and the haemoglobin A1c levels and the electrocardiographic data to the fact that the duration of diabetes was short, since our patients were children. We believe that patients with type 1 diabetes mellitus should be followed up closely in terms of sudden death, as they have electrocardiographic changes that may cause arrhythmias compared to the control group. However, more studies with longer follow-up periods are necessary to support our data.

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Bhattad, Pradnya Brijmohan, and Vinay Jain. "Update on Electrocardiographic Data in Junctional Rhythm." Journal of Medical Research 6, no. 3 (June 30, 2020): 112–14. http://dx.doi.org/10.31254/jmr.2020.6313.

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van Oosterom, A., T. F. Oostendorp, G. J. Huiskamp, and H. J. ter Brake. "The magnetocardiogram as derived from electrocardiographic data." Circulation Research 67, no. 6 (December 1990): 1503–9. http://dx.doi.org/10.1161/01.res.67.6.1503.

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Tahir, Moizza, Uzma Bashir, Najia Ahmed, and Jauhar Mumtaz. "ELECTROCARDIOGRAPHIC CHANGES WITH STANDARD DOSE OF MEGLUMINE ANTIMONIATE THERAPY IN CUTANEOUS LEISHMANIASIS." PAFMJ 71, no. 4 (August 26, 2021): 1235–38. http://dx.doi.org/10.51253/pafmj.v71i4.4048.

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Objective: To identify electrocardiographic changes associated with parenteral meglumine antimoniate and to estimate frequency of these changes. Study Design: Prospective observational study. Place and Duration of Study: Dermatology department, Combined Military Hospital Quetta and Multan, from Apr 2018 to Feb 2019. Methodology: Total of 87 patients was recruited by consecutive sampling technique. Cases of Leishmaniasis were confirmed by Leishmania donovani bodies in smear or skin biopsy. Base line electrocardiograph was done and then repeated weekly. All patients were given 15mg/kg body weight intramuscular meglumine antimoniate (Glucantime). Any change in electrocardiograph was documented. Follow up electrocardiograph was repeated two weeks after hospital discharge. Data was analyzed using SPSS-20. Results: Changes in electrocardiograph appeared between 7-27 days mean 16 SD ± 4.58. T-wave inversion was recorded in 41 (47.12%), ST elevation in 1 (1.14%), prolonged QT interval in 1 (1.14%). Meglumine antimoniate therapy was discontinued after ECG change for 5 ± SD 3 days of therapy. Follow up electrocardiograph two weeks after hospital discharge was normal. Conclusion: Early repolarization defects of T wave inversion and ST segment deviation were found with standard doses of meglumine antimoniate therapy.

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Jančauskaitė, Dovilė, Robertas Samalavičius, Sigita Glaveckaitė, Palmyra Semėnienė, and Pranas Šerpytis. "Electrocardiographic changes during therapeutic hypothermia: observational data from a single centre." Acta medica Lituanica 26, no. 3 (January 11, 2020): 159–66. http://dx.doi.org/10.6001/actamedica.v26i3.4145.

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Background. Therapeutic hypothermia is recommended to reduce the risk of hypoxic brain damage and improve short-term survival after cardiac arrest. It also temporarily affects the cardiac conduction system. The aim of this study was to evaluate electrocardiographic changes during therapeutic hypothermia and their impact on the outcome. Materials and methods. This retrospective analysis involved 26 patients who underwent therapeutic hypothermia after cardiac arrest in Vilnius University Hospital Santaros Klinikos from 2011 to 2015. Results. During cooling, a significant reduction in the heart rate (p = 0.013), shortening of QRS complex duration (p = 0.041), and prolongation of the QTc interval (p < 0.001) were observed. During the cooling period, five patients had subtle Osborn waves, which disappeared after rewarming. The association between electrocardiographic changes during cooling and unfavourable neurological outcome or in-hospital mortality was non-significant. Conclusions. Therapeutic hypothermia after cardiac arrest causes reversible electrocardiographic changes that do not increase the risk of in-hospital mortality or unfavourable neurological outcomes.

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Paixão, Gabriela M. M., Emilly M. Lima, Paulo R. Gomes, Derick M. Oliveira, Manoel H. Ribeiro, Jamil S. Nascimento, Antonio H. Ribeiro, Peter W. Macfarlane, and Antonio L. P. Ribeiro. "Electrocardiographic Predictors of Mortality: Data from a Primary Care Tele-Electrocardiography Cohort of Brazilian Patients." Hearts 2, no. 4 (September 29, 2021): 449–58. http://dx.doi.org/10.3390/hearts2040035.

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Computerized electrocardiography (ECG) has been widely used and allows linkage to electronic medical records. The present study describes the development and clinical applications of an electronic cohort derived from a digital ECG database obtained by the Telehealth Network of Minas Gerais, Brazil, for the period 2010–2017, linked to the mortality data from the national information system, the Clinical Outcomes in Digital Electrocardiography (CODE) dataset. From 2,470,424 ECGs, 1,773,689 patients were identified. A total of 1,666,778 (94%) underwent a valid ECG recording for the period 2010 to 2017, with 1,558,421 patients over 16 years old; 40.2% were men, with a mean age of 51.7 [SD 17.6] years. During a mean follow-up of 3.7 years, the mortality rate was 3.3%. ECG abnormalities assessed were: atrial fibrillation (AF), right bundle branch block (RBBB), left bundle branch block (LBBB), atrioventricular block (AVB), and ventricular pre-excitation. Most ECG abnormalities (AF: Hazard ratio [HR] 2.10; 95% CI 2.03–2.17; RBBB: HR 1.32; 95%CI 1.27–1.36; LBBB: HR 1.69; 95% CI 1.62–1.76; first degree AVB: Relative survival [RS]: 0.76; 95% CI0.71–0.81; 2:1 AVB: RS 0.21 95% CI0.09–0.52; and RS 0.36; third degree AVB: 95% CI 0.26–0.49) were predictors of overall mortality, except for ventricular pre-excitation (HR 1.41; 95% CI 0.56–3.57) and Mobitz I AVB (RS 0.65; 95% CI 0.34–1.24). In conclusion, a large ECG database established by a telehealth network can be a useful tool for facilitating new advances in the fields of digital electrocardiography, clinical cardiology and cardiovascular epidemiology.

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Xuan, Yan, Hyuga Hara, Satoko Honda, Yanpeng Li, Yusuke Fujita, Takayuki Arie, Seiji Akita, and Kuniharu Takei. "Wireless, minimized, stretchable, and breathable electrocardiogram sensor system." Applied Physics Reviews 9, no. 1 (March 2022): 011425. http://dx.doi.org/10.1063/5.0082863.

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Home-use, wearable healthcare devices may enable patients to collect various types of medical data during daily activities. Electrocardiographic data are vitally important. To be practical, monitoring devices must be wearable, comfortable, and stable, even during exercise. This study develops a breathable, stretchable sensor sheet by employing a kirigami structure, and we examine the size dependence of electrocardiographic sensors. Because the kirigami film has many holes, sweat readily passes through the sensor from the skin to the environment. For comfort, in addition to breathability, electrocardiographic sensor size is minimized. The limitation of the size is studied in relation to the signal-to-noise ratio of electrocardiographic signals, even under exercise. We found that the optimal size of the sensor is ∼200 mm2 and the distance between electrodes is 1.5 cm. Finally, long-term wireless electrocardiographic monitoring is demonstrated using data transmission to a smart phone app during different activities.

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WATANABE, TOSHIO. "Respiratory rate estimation from electrocardiographic time-series data." Japanese Journal of Electrocardiology 7, no. 3 (1987): 287–93. http://dx.doi.org/10.5105/jse.7.287.

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Hessen, Scott E. "Vector — Vectorcardiographic visualization of signal-averaged electrocardiographic data." Journal of the American College of Cardiology 15, no. 2 (February 1990): A267. http://dx.doi.org/10.1016/0735-1097(90)92781-v.

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Johannesen, Lars, Christine Garnett, and Marek Malik. "Electrocardiographic Data Quality in Thorough QT/QTc Studies." Drug Safety 37, no. 3 (February 20, 2014): 191–97. http://dx.doi.org/10.1007/s40264-014-0140-4.

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Chapel, J. M., C. Castillo, J. Hernández, M. Cipone, and J. L. Benedito. "Electrocardiographic reference values for healthy Netherland Dwarf rabbits and the influence of body position, age and gender." World Rabbit Science 25, no. 4 (December 28, 2017): 399. http://dx.doi.org/10.4995/wrs.2017.7424.

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<p>The aim of this study was to provide reference values for a single, popular breed of pet rabbit. Moreover, additional objectives were to determine whether sex, body position or age alter Netherland Dwarf rabbit electrocardiographic variables and whether the use of electrocardiographic filters affects those variables. Forty Netherland Dwarf rabbits were examined clinically and standard six-lead electrocardiograms (ECGs) were recorded in sternal and then dorsal recumbency. At first power-line and anti-drift filters were used and then they were disabled. The following variables were measured in lead II: heart rate; P wave duration and amplitude; P-R interval; QRS duration; R wave amplitude (with and without filters); Q-T interval; T wave duration and amplitude; S-T segment; J-T duration; and mean electrical axis (MEA) (with and without filters). MEA was determined by 3 different methods. After statistical processing of the data, our results showed that there were no significant differences between both recumbencies, with the exception of the J-T duration, which was higher in dorsal recumbency. The R wave amplitude using electrocardiographic filters showed significant differences between males (0.083 mV) and females (0.115 mV; P<0.05); and between younger rabbits (0.108 mV) and older rabbits (0.097 mV; P<0.05). These differences were not shown between R waves with filters disabled. Moreover, the strongest correlation was between 2 MEA methods without filters. MEA was more leftward in the pet rabbit than in other species (dog or cats). In conclusion, electrocardiography recording without electrocardiographic filters should be assessed when it is possible, and the specific ECGs characteristics for Netherland Dwarf rabbit should be taken into account.</p>

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Rahmat, Defni, Firdaus, and Gustina Indriati. "Prototipe Alat Pendeteksi Kelainan Kelenjar Tiroid Dengan Menggabungkan Teknik Iridologi Dan Elektrokardiografi Berbasis Jaringan Saraf Tiruan." Jurnal Ilmiah Poli Rekayasa 11, no. 1 (October 15, 2015): 48. http://dx.doi.org/10.30630/jipr.11.1.18.

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Some of the external symptoms of hyperthyroidism may be experienced by people who are not suffering from hyperthyroid disease, therefore needs a thorough examination and diagnosis for patients with hyperthyroidism that drug delivery and targeted therapy. A thorough examination of this costly and quite a long time. This research make a prototype instrumentation to help detect the presence of symptoms of thyroid gland disorders, especially hyperthyroidism, do not use chemicals and does not hurt the patient. The principle of this tool is to combine technology with electrocardiographic Iridology specifically based artificial neural network. In the first year is the design and realization of a prototype of the channel electrocardiograph-based personal computer for measurement of cardiac patients megalami signal abnormalities tachycardia (one of the symptoms of hyperthyroidism). Electrocardiography will measure and display signal to monitor a patient's heart, can store data and make a decision whether the patients had tachycardia heart rhythm disorder or not. In both make iridology devices based neural network to detect any abnormalities of the thyroid gland through the iris image. Electrocardiography device coupled with iridology software in order to get a prototype for the detection of hyperthyroidism through the measurement of two variables: cardiac signal and image of the iris. The Merger is software into a single entity has not done separately but have been able to perform measurements on patients. Tests have been conducted on 8 (eight) patients and has not been accompanied by a doctor, the conclusion of the test is that all patients tested did not experience hyperthyroidism.

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Kuznetsov, A. A., S. A. Permyakov, and L. T. Sushkova. "Topologic imagery for amplitude-phase coupling of electrocardiographic data." Infokommunikacionnye tehnologii 16, no. 2 (2018): 234–40. http://dx.doi.org/10.18469/ikt.2018.16.2.13.

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Mamish, A. M., and N. E. Burba. "Electrocardiographic data in Wolff-Parkinson-White syndrome in children." Kazan medical journal 66, no. 4 (August 15, 1985): 297–98. http://dx.doi.org/10.17816/kazmj61890.

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Premature excitation of the ventricles, or Wolff-Parkinson-White syndrome, is associated with the presence of additional muscle pathways through which the impulse is carried from the atria to the ventricles.

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Warner, Robert A., Ronald H. Selvester, Norma E. Hill, and Galen S. Wagner. "Diagnostic importance of the statistical variance of electrocardiographic data." Journal of Electrocardiology 32 (January 1999): 49. http://dx.doi.org/10.1016/s0022-0736(99)90038-9.

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Jaillon, P., J. Morganroth, I. Brumpt, and G. Talbot. "Overview of electrocardiographic and cardiovascular safety data for sparfloxacin." Journal of Antimicrobial Chemotherapy 37, suppl A (May 1, 1996): 161–67. http://dx.doi.org/10.1093/jac/37.suppl_a.161.

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Zuber, Michel, Peter Kipfer, Patti Arand, Peter Bauer, and Robert Warner. "Detecting hemodynamic abnormalities using electrocardiographic and cardiac acoustic data." Journal of Electrocardiology 38, no. 4 (October 2005): 144. http://dx.doi.org/10.1016/j.jelectrocard.2005.06.089.

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Oțelea, Marina Ruxandra, Anca Streinu-Cercel, Daniela Manolache, Andreea Mutu, Lavinia Călugăreanu, Dana Mateș, and Oana Săndulescu. "The “ECG modifications induced by the disturbance of the circadian rhythm in night-shift workers (ECGNoct)” study protocol." Romanian Journal of Occupational Medicine 70, no. 1 (December 1, 2019): 12–19. http://dx.doi.org/10.2478/rjom-2019-0002.

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Abstract In many large cohort studies, the night shift constitutes a risk factor for developing cardiovascular disease and diabetes in workers. Current screening tests for people working in night shift include fasting glycaemia and electrocardiography. In fact, there are few studies focused on the description of the electrocardiographic changes after the night shift. This article describes the protocol of the “ECG modifications induced by the disturbance of the circadian rhythm in night-shift workers (ECGNoct)” study, which was initiated by the National Institute for Infectious Diseases “Prof. Dr. Matei Balș”. Nurses represent the target population. The protocol includes a full medical and occupational history, lifestyle habits (smoking, alcohol, nutrition), anthropometric and blood pressure measurements, blood tests (fasting glycemia, total cholesterol, triglycerides and high density lipoprotein cholesterol) and electrocardiogram recording. For nurses working in (night) shifts, we will record the electrocardiogram before and soon after the night shift. A cross sectional study will analyze the incidence of the metabolic syndrome criteria, the cardio-metabolic diseases and the electrocardiographic modifications and will compare the results between the group of nurses working and the group of nurse who do not. Based on these results, a longitudinal study will test the hypothesis that night shift increases the risk for cardio-metabolic diseases and that the electrocardiographic modifications precede the clinical symptoms. The results of the study will provide data on the association of night shifts and other non-occupational risk factors with the cardio-metabolic diseases in this specific population of healthcare workers that potentially will integrate into the occupational medicine policies.

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Ali Dasti, Mashooq, Syed Fasih Ahmed Hashmi Ahmed Hashmi, Mukhtiar Hussain Jaffery, Syed Fasih Ahmed Hashmi, Hamid Nawaz Ali Memon, Athar Hussain Memon, Arshad Maqbool Jalbani, and Syed Zulfiquar Ali Shah. "ACUTE ISCHEMIC STROKE." Professional Medical Journal 23, no. 05 (May 10, 2016): 535–38. http://dx.doi.org/10.29309/tpmj/2016.23.05.1579.

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Objectives: To determine the electrocardiographic and echocardiographicfindings in patients with acute ischemic stroke (potential source of cardiac emboli). StudyDesign: Cross section descriptive study. Period: Six months. Setting: Liaquat University HospitalHyderabad. Patients and Methods: The subjects with history and clinical features suggestiveof cerebrovascular accident (CVA). After establishing the diagnosis of acute ischemic strokethe electrocardiography (ECG) was advised and those subjects had abnormal findings onECG were went for echocardiography to evaluate the specific cause related to acute ischemicstroke. The two-dimensional and M-mode echocardiography was performed by consultantcardiologist had ≥ five years experienced in echocardiography because echocardiographicstudy in patients with cerebrovascular accident (confirmed on CT scan) is evidence of potentialcardiac abnormalities as a predisposing cause for the vascular event. The data was collectedon pre-designed proforma and was analyzed in SPSS 16 and the frequency and percentagewas calculated. Results: Total one hundred patients with acute ischemic stroke were studiedfor electrocardiographic and echocardiographic findings during six months study period. Themean ±SD for age of patients with acute ischemic stroke was 43.67±10.62. Majority of thepatients were males and 69% while the age and gender cross tabulation was also statisticallysignificant (p=0.03). The electrocardiographic abnormalities were indentified in 80% patients(AF in 16.2%, LVH in 22.5%, LBBB in 10%, wide QRS complex in 10% and ischemic changesin 8.7%) while the echocardiographic abnormalities were detected in 70% patients of whichglobal hypokinesia (28.5%), LVH (25.7%) and diastolic dysfunction (17.14)% were predominant.Conclusion: The cardiac embolic source is the major cause for acute ischemic stroke anddetected by echocardiography as it is the main tool in diagnosing the source of embolus.

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Kafle, Ram Chandra, Navaraj Paudel, Dibya Sharma, and Vijaya Madhav Alurkar. "ELECTROCARDIOGRAPHIC PROFILE OF DILATED CARDIOMYOPATHY IN PATIENTS ATTENDING A TERTIARY CARE HOSPITAL OF WESTERN NEPAL." Journal of Universal College of Medical Sciences 6, no. 1 (November 20, 2018): 40–45. http://dx.doi.org/10.3126/jucms.v6i1.21728.

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INTRODUCTION: Cardiomyopathy is a disease of the heart muscle that leads to deterioration of myocardial functioning. It has different morphological variation with dilated cardiomyopathy being the most common form comprising over 90% of all cases. Heart failure (HF) is the most common clinical presentation of dilated cardiomyopathy. Various electrocardiographic changes are common in these patients. The most common cause of sudden death in these patients is arrhythmia. This study aimed at characterizing different electrocardiographic changes in patients of dilated cardiomyopathy admitted for heart failure.MATERIAL AND METHODS: A retrospective analysis of records of admitted patients from l" January 2015 to 30th April 2018 was conducted. Study was conducted after obtaining ethical clearance from institutional review board. Data was collected in a preformed proforma and analyzed using SPSS 20.0 version.RESULTS: Consecutive 400 cases of dilated cardiomyopathy with systolic dysfunction (LVEF<40%) were taken for the study. Two hundred and fifty two (63 %) were male. The mean age of patients was 59.33 (± 15.76) years. The most common risk factors in our patients were smoking (66%) followed by systemic hypertension (49%), IHD (32%), and diabetes mellitus (33%) respectively. Out of 400 patients, abnormal ECG were found in 82.5%. The most common abnormality was LVH (30.7%) followed by LBBB (22.5%) and AF (20.5%).CONCLUSION: The percentage of abnormal electrocardiographic findings was high in our study. All patients of dilated cardiomyopathy should undergo electrocardiography screening for risk stratification and to prevent serious consequences with early necessary intervention.Journal of Universal College of Medical SciencesVol. 6, No. 1, 2018, Page: 40-45

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Nikiema, S., Z. Lahlafi, M. Desire, Z. Lakhal, and A. Benyass. "A SEVERE STENOSIS OF THE PROXIMAL SEGMENT OF THE LEFT ANTERIOR DESCENDING CORONARY ARTERY PRESENTING WITH AN INFERO-LATERO-BASAL ST-ELEVATION MYOCARDIAL INFARCTION : A CASE REPORT." International Journal of Advanced Research 9, no. 07 (July 31, 2021): 375–82. http://dx.doi.org/10.21474/ijar01/13136.

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A 57-years-old man presented in our department of emergency with an acute chest pain infarct-like. The electrocardiogram realised showed an ST elevation in the infero-latero-basal leads suggesting an occlusion of the right coronary artery or the left circumflex coronary artery. However, the coronary angiography that was performed showed a subocclusion of the proximal left anterior descending coronary artery, in contrast to the expected results. This case was reported using electrocardiography and coronary angiography data and the electrocardiogram changes after a percutaneous coronary intervention. The particularity of this case lies in the lack of correlation between the electrocardiographic Changes and the Coronary Angiographic Findings.

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Chen, Ke-Wei, Laura Bear, and Che-Wei Lin. "Solving Inverse Electrocardiographic Mapping Using Machine Learning and Deep Learning Frameworks." Sensors 22, no. 6 (March 17, 2022): 2331. http://dx.doi.org/10.3390/s22062331.

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Electrocardiographic imaging (ECGi) reconstructs electrograms at the heart’s surface using the potentials recorded at the body’s surface. This is called the inverse problem of electrocardiography. This study aimed to improve on the current solution methods using machine learning and deep learning frameworks. Electrocardiograms were simultaneously recorded from pigs’ ventricles and their body surfaces. The Fully Connected Neural network (FCN), Long Short-term Memory (LSTM), Convolutional Neural Network (CNN) methods were used for constructing the model. A method is developed to align the data across different pigs. We evaluated the method using leave-one-out cross-validation. For the best result, the overall median of the correlation coefficient of the predicted ECG wave was 0.74. This study demonstrated that a neural network can be used to solve the inverse problem of ECGi with relatively small datasets, with an accuracy compatible with current standard methods.

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Willems, Jos L., Pierre Arnaud, Jan H. Van Bemmel, Peter J. Bourdillon, Rosanna Degani, Bernard Denis, Ian Graham, et al. "A reference data base for multilead electrocardiographic computer measurement programs." Journal of the American College of Cardiology 10, no. 6 (December 1987): 1313–21. http://dx.doi.org/10.1016/s0735-1097(87)80136-5.

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Gacek, Adam. "Data structure-guided development of electrocardiographic signal characterization and classification." Artificial Intelligence in Medicine 59, no. 3 (November 2013): 197–204. http://dx.doi.org/10.1016/j.artmed.2013.09.004.

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Prilutskiy, D. A., S. V. Selishchev, and A. O. Ustinov. "A Device for Wireless Transmission of Electrocardiographic and Electroencephalographic Data." Biomedical Engineering 45, no. 6 (March 2012): 214–17. http://dx.doi.org/10.1007/s10527-012-9245-1.

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Sommargren, Claire E. "Electrocardiographic Abnormalities in Patients With Subarachnoid Hemorrhage." American Journal of Critical Care 11, no. 1 (January 1, 2002): 48–56. http://dx.doi.org/10.4037/ajcc2002.11.1.48.

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Subarachnoid hemorrhage is a serious neurological disorder that is often complicated by the occurrence of electrocardiographic abnormalities unexplained by preexisting cardiac conditions. These morphological waveform changes and arrhythmias often are unrecognized or misinterpreted, potentially placing patients at risk for inappropriate management. Many previous investigations were retrospective and relied on data collected in an unsystematic manner. More recent studies that included use of serial electrocardiograms and Holter recordings have provided new insight into the high prevalence of electrocardiographic changes in subarachnoid hemorrhage. Research on the prevalence, duration, and clinical significance of these electrocardiographic abnormalities and on associated factors and etiological theories is reviewed.

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Skampardoni, Sofia, Dimitrios Poulikakos, Marek Malik, Darren Green, and Philip A. Kalra. "The potential of electrocardiography for cardiac risk prediction in chronic and end-stage kidney disease." Nephrology Dialysis Transplantation 34, no. 7 (August 6, 2018): 1089–98. http://dx.doi.org/10.1093/ndt/gfy255.

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Abstract Cardiovascular mortality is very high in chronic and end-stage kidney disease (ESKD). However, risk stratification data are lacking. Sudden cardiac deaths are among the most common cardiovascular causes of death in these populations. As a result, many studies have assessed the prognostic potential of various electrocardiographic parameters in the renal population. Recent data from studies of implantable loop recordings in haemodialysis patients from five different countries have shed light on a pre-eminent bradyarrhythmic risk of mortality. Importantly, heart block addressed by permanent pacing system was detected in a proportion of patients during the prolonged recording periods. Standard electrocardiogram is inexpensive, non-invasive and easily accessible. Hence, risk prediction models using this simple investigation tool could easily translate into clinical practice. We believe that electrocardiographic assessment is currently under-valued in renal populations. For this review, we identified studies from the preceding 10 years that assessed the use of conventional and novel electrocardiographic biomarkers as risk predictors in chronic and ESKD. The review indicates that conventional electrocardiographic markers are not reliable for risk stratification in the renal populations. Novel parameters have shown promising results in smaller studies, but further validation in larger populations is required.

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Georgieva-Tsaneva, Galya Nikolova. "Innovative Cardio Educational Software System in Support of Medical Education." International Journal of Emerging Technologies in Learning (iJET) 16, no. 22 (November 30, 2021): 221–28. http://dx.doi.org/10.3991/ijet.v16i22.25207.

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The article presents an innovative software system that allows for processing and comparative analysis of biomedical data. The presented system uses real cardiological data obtained with modern medical devices - electrocardiography, continuous Holter monitoring, photoplethysmographic device, and others. The software system enables students studying at higher medical universities, majoring in cardiology to get acquainted and acquire skills for working with real cardiac records. The presented system allows the examination and use of cardiac recordings obtained using modern non-invasive technologies for research and procedures - modern electrocardiographic equipment, Holter-monitoring systems, photoplethysmographic devices. This will enable students to gain prior experience in working with real biomedical patient records. The presented software system together with the traditional training will help to increase the quality of modern education, will contribute to the acquisition of abilities, skills, and competencies necessary for future medical professionals.

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Funk, Marjorie, Kristopher P. Fennie, Krista A. Knudson, and Halley Ruppel. "Monitor-Watcher Use, Nurses’ Knowledge of Electrocardiographic Monitoring, and Arrhythmia Detection." American Journal of Critical Care 30, no. 1 (January 1, 2021): 38–44. http://dx.doi.org/10.4037/ajcc2021122.

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Background Electrocardiographic telemetry monitors are ubiquitous in hospitals. Dedicated monitor watchers, either on the unit or in a centralized location, are often responsible for observing telemetry monitors and responding to their alarms. The impact of use of monitor watchers is not known. Objectives To evaluate the association of monitor-watcher use with (1) nurses’ knowledge of electrocardiographic (ECG) monitoring and (2) accuracy of arrhythmia detection. Methods Baseline data from 37 non–intensive care unit cardiac patient care areas in 17 hospitals in the Practical Use of the Latest Standards for Electrocardiography trial were analyzed. Nurses’ knowledge (n = 1136 nurses) was measured using a validated, 20-item online test. Accuracy of arrhythmia detection (n = 1189 patients) was assessed for 5 consecutive days by comparing arrhythmias stored in the monitor with nurses’ documentation. Multiple regression was used to evaluate the association of use of monitor watchers with scores on the ECG-monitoring knowledge test. The association of monitor-watcher use with accuracy of arrhythmia detection was examined by χ2 analysis. Results Of the 37 units, 13 (35%) had monitor watchers. Use of monitor watchers was not independently associated with ECG-monitoring knowledge (P = .08). The presence of monitor watchers also was not significantly associated with the accuracy of arrhythmia detection (P = .94). Conclusion Although the use of monitor watchers was not associated with diminished nurses’ knowledge of ECG monitoring, it also was not associated with more accurate arrhythmia detection. If implementing a monitor-watcher program, critical safety points, such as ensuring closed-loop communication, must be considered.

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Santos, F. P. dos, J. P. E. Pascon, D. T. P. Pereira, B. L. Anjos, M. L. A. Mistieri, I. D. Silveira, and M. L. Porciuncula. "Clinical and histopathological features of myocarditis in dogs with visceral leishmaniasis." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 67, no. 6 (December 2015): 1519–27. http://dx.doi.org/10.1590/1678-4162-7854.

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Visceral leishmaniasis (VL) is a cosmopolitan parasitic zoonosis that can promote myocarditis and heart rate changes in canine and human hosts. Thus, histopathological aspects of the myocardium and clinical, hematological, biochemical, radiological and electrocardiographic data were evaluated in a group of 36 dogs naturally infected with VL (VLG) and compared to data from 15 non-infected dogs (CG=Control Group). A prevalence of asymptomatic dogs was present in the CG (100%) and polysymptomatic dogs in the VLG (66%). In addition, two dogs in the VLG demonstrated systolic murmurs in the mitral valve region: one with a II/VI intensity and the other with a III/VI intensity. The mean values of RBC, hemoglobin and hematocrit were lower in dogs in VLG and were associated with higher values of total protein, total leukocytes, neutrophils, creatine kinase overall (CK) and the CK-MB fraction (CK-MB). The absence of radiographic changes was accompanied by a predominance of respiratory sinus arrhythmia associated with episodes of migratory pacemaker and sinus arrest in dogs in VLG (75%), sinus rhythm in dogs in CG (60%) and decreased P wave amplitude in VLG electrocardiography. Mononuclear cell infiltration was detected in the myocardium of 77,8% of dogs in GVL and classified primarily as mild multifocal lymphohistioplasmacytic. Amastigotes were detected in only one dog, which did not allow the association between myocarditis and parasitism, although the myocardial lesions that were found constitute irrefutable evidence of myocarditis in the VLG dogs, accompanied by lenient electrocardiographic changes compared to CG.

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Callahan, Timothy S., and Elizabeth Charuvastra. "Contents and Quality Control of Ambulatory Electrocardiographic (Holter) Reports and Data." Drug Information Journal 34, no. 1 (January 2000): 59–68. http://dx.doi.org/10.1177/009286150003400106.

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Cotter, Paul A., and Kenneth J. Rodnick. "Fishing for an ECG: a student-directed electrocardiographic laboratory using rainbow trout." Advances in Physiology Education 31, no. 2 (June 2007): 211–17. http://dx.doi.org/10.1152/advan.00096.2006.

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Cardiac physiology is emphasized in many undergraduate physiology courses, but few nonmammalian vertebrate model systems exist that 1) can be studied fairly noninvasively, 2) are well suited for controlled experimentation, and 3) emphasize principles characteristic of the vertebrate heart. We have developed an inquiry-based undergraduate/graduate-level laboratory in cardiac physiology and electrocardiography using rainbow trout ( Oncorhynchus mykiss Walbaum) and the BioPac MP30 data-acquisition system (other fish species and/or electrocardiographic recording devices can be substituted). This laboratory facilitates intensive study of vertebrate electrocardiograms (ECGs) under a variety of environmental and physiological perturbations and is ideal for use in multisession, inquiry-based laboratory projects in animal physiology. Furthermore, students gain valuable experience in scientific inquiry, study design, following and/or developing scientific protocols, and animal care. This laboratory requires the ability to keep captive fish of at least 100 g and equipment to record ECGs. Departments meeting these requirements can adopt this technique at modest expense. Student enthusiasm and feedback were positive, and several students commented that the nonlethal methods used added to the laboratory's perceived value.

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Demircan, Tulay, Zuhal Onder Sivis, Burçak Tatlı Güneş та Cem Karadeniz. "Evaluation of electrocardiographic markers of cardiac arrhythmic events and their correlation with cardiac iron overload in patients with β-thalassemia major". Cardiology in the Young 30, № 11 (4 вересня 2020): 1666–71. http://dx.doi.org/10.1017/s1047951120002498.

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AbstractIron overload is associated with an increased risk of atrial and ventricular arrhythmias. Data regarding the relationship between electrocardiographic parameters of atrial depolarisation and ventricular repolarisation with cardiac T2* MRI are scarce. Therefore, we aimed to investigate these electrocardiographic parameters and their relationship with cardiac T2* value in patients with β-thalassemia major. In this prospective study, 52 patients with β-thalassemia major and 52 age- and gender-matched healthy patients were included. Electrocardiographic measurements of QT, T peak to end interval, and P wave intervals were performed by one cardiologist who was blind to patients’ data. All patients underwent MRI for cardiac T2* evaluation. Cardiac T2* scores less than 20 ms were considered as iron overload. P wave dispersion, QTc interval, and the dispersions of QT and QTc were significantly prolonged in β-thalassemia major patients compared to controls. Interestingly, we found prolonged P waves, QT and T peak to end dispersions, T peak to end intervals, and increased T peak to end/QT ratios in patients with T2* greater than 20 ms. No significant correlation was observed between electrocardiographic parameters and cardiac T2* values and plasma ferritin levels. In conclusion, our study demonstrated that atrial depolarisation and ventricular repolarisation parameters are affected in β-thalassemia major patients and that these parameters are not correlated with cardiac iron load.

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Bachur, Cynthia Kallás, Marlon Hermógenes Garcia, Camila Araújo Bernardino, Rogério Camillo Requel, and José Alexandre Bachur. "Analysis of cardiac exams: electrocardiogram and echocardiogram use In Duchenne muscular dystrophies." Fisioterapia em Movimento 27, no. 3 (September 2014): 429–36. http://dx.doi.org/10.1590/0103-5150.027.003.ao14.

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Introduction Duchenne Muscular Dystrophies (DMD) is a genetic muscle disorder that causes degeneration and atrophy of skeletal muscle and heart. Objective The aim of this survey is accomplish an evaluation electrocardiographic and echocardiography in the patients bearers of Duchene Muscular Dystrophies (DMD), to observe which alterations, which the degree of cardiac compromising these patient present and the effectiveness of these exams in the evaluation cardiologic. Methods Nine patients of the sex male bearers of DMD, with medium age of 14.12 ± 4.19 years, varying of 7 to 23 years were appraised. All were submitted to the evaluation physiotherapy and the cardiologic: electrocardiogram and echocardiogram. Results The experimental conditions of the present survey we propitiate the observation of the alterations echocardiography, as well as: significant increase in the diastolic diameter of the left ventricular (LV), increase in the systolic diameter of the left atrium (LA), and significant decrease of the ejection fraction of the LV, characterizing global systolic function reduced, and of the alterations electrocardiographic suggested possible overload of RV, septum hypertrophy, blockade of left previous fascicle and overload of atrium left. Compatible alterations of hypertrophy left ventricular were not observed. Conclusion The evidences corroborate with the data described in the literature in the characterization of an important heart compromising that these patient present, like this the evaluation cardiologic, through the complemented exams of the echocardiography and electrocardiography provide important information for the prognostic, the accompaniment, and the treatment of patient bearers of DMD.

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Çinar, Tufan, Mert İlker Hayiroğlu, Murat Selçuk, Göksel Cinier, Vedat Çiçek, Selami Doğan, Şahhan Kiliç, Süha Asal, Murat Mert Atmaca, and Ahmet Lütfullah Orhan. "Evaluation of electrocardiographic P wave parameters in predicting long-term atrial fibrillation in patients with acute ischemic stroke." Arquivos de Neuro-Psiquiatria 80, no. 09 (September 2022): 877–84. http://dx.doi.org/10.1055/s-0042-1755322.

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Abstract Background Electrocardiographic parameters, such as P wave peak time (PWPT), P wave duration (PWD), and P wave amplitude in lead DI, have been utilized to assess left atrial anomalies linked to the development of atrial fibrillation (AF) in different cohort settings. Objective To compare electrocardiographic parameters, such as P waves, in predicting long-term AF risk in acute ischemic stroke cases. Methods The data of 231 consecutive acute ischemic stroke cases were retrospectively collected. Two independent cardiologists interpreted the electrocardiography recordings for PWPT, PWD, and P wave amplitude in lead DI. The median follow-up study period was 16 (interquartile range [IQR]: 11–24) months. Results In total, AF was detected in 43 (18.6%) cases. All studied P wave parameters were found to be statistically significant in cases with AF. Based on multivariable logistic regression analysis, dementia, left atrium volume index, PWD (razão de chances [RC]: 1.11; 95% confidence interval [CI]: 1.058–1.184; p = 0.003), PWPT in lead DII (RC: 1.030; 95%CI: 1.010–1.050; p = 0.003), and advanced interatrial block morphology were independent predictors of long-term AF. P wave duration had the highest area under the curve value, sensitivity, and specificity for long-term AF in such cases compared with the other P wave parameters. Conclusions Our head-to-head comparison of well-known P wave parameters demonstrated that PWD might be the most useful P wave parameter for long-term AF in acute ischemic stroke cases.

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Khotimah, S. N., F. S. Wahyuni, and F. Haryanto. "Statistical analysis of quantitative electrocardiographic signals with standard limb leads: Influences of gel use, subject positions, and electrodes configurations." Journal of Physics: Conference Series 2243, no. 1 (June 1, 2022): 012004. http://dx.doi.org/10.1088/1742-6596/2243/1/012004.

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Abstract An electrocardiogram records the heart’s electrical activity that provides helpful information on the cardio electrophysiological process. One cycle of cardiac contraction and relaxation produces the basic waves that consist of a P wave (atrial depolarization), a QRS complex (ventricular depolarization), and a T wave (ventricular repolarization). In this study, the quantitative electrocardiographic signals from six adult females aged 19 to 22 years in a relaxed state were measured using Cobra4 Electrophysiology with standard limb leads. Six conditions of the experiments were carried out for each subject to investigate the influence of gel use, subject positions, and electrodes configurations on electrocardiographic signals parameters: amplitude, duration, RRinterval, and correlation coefficient between two signals. It was obtained that the gel did not significantly influence the results for subjects when sitting but marginally influenced some electrocardiographic parameters for some individual subjects in lying positions. The subject positions influenced marginally for RRinterval. Electrode configurations are found to be related to the positive or negative deflection of the resulting electrocardiographic signals. All the measurements showed that two data sets of the ECG signals have a strong correlation for each subject in each condition.

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Aleixo, A. S. C., A. Alfonso, M. G. Fillippi, S. B. Chiacchio, and M. L. G. Lourenço. "Retrospective study of allometric relationship between heart rate, electrocardiographic parameters and bodyweight in dogs." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 71, no. 6 (December 2019): 1800–1804. http://dx.doi.org/10.1590/1678-4162-10407.

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ABSTRACT The allometric relationship between bodyweight (BW) and heart rate (HR) has been described as inversely proportional in domestic species, but that has been refuted. The relationship between HR and electrocardiographic variables is described in literature. However, studies about the variation and influence of factors on the hemodynamic and electrocardiographic parameters in dogs are not abundant. As the metabolic rate is defined as the production and dissipation of heat by the body surface area (BSA) in m², it is essential to define that relationship. A retrospective study was conducted to analyze the correlation between HR, ECG parameters and BW in dogs. One thousand electrocardiographic tracings were analyzed in addition to the ECG parameters and clinical data such as gender, age and bodyweight. The determination of BSA was performed as follows: BSA (m2) = (10.1 x bodyweight 0.67) X 10-4. When the unified groups were analyzed, there was a negative but weak correlation (r= -0.14, P< 0.0001) between bodyweight and HR. There were differences between weight groups regarding electrocardiographic variables. There is no allometric relationship between BW and HR in dogs. Weight was associated with changes in ECG variables.

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Alekseeva, D. Yu, O. А. Kofeynikova, D. I. Marapov, and E. S. Vasichkina. "Electrocardiographic parameters and features of ventricular arrhythmias in various arrhythmogenic cardiomyopathy forms in the pediatric population: a systematic review and meta-analysis." Russian Journal of Cardiology 27, no. 3S (September 14, 2022): 5147. http://dx.doi.org/10.15829/1560-4071-2022-5147.

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Arrhythmogenic cardiomyopathy (ACM) is a rare genetic disease characterized by the development of life-threatening ventricular arrhythmias and impaired ventricular systolic function due to fibrofatty infiltration of the myocardium. Currently, the Task Force 2010 criteria and the Padua criteria are proposed for the diagnosis of this disease. However, despite the multiparametric approach, there are certain limitations of the presented algorithms for disease establishment, especially in children. Carrying out such high-tech diagnostic methods as endomyocardial biopsy and magnetic resonance imaging is extremely difficult in the pediatric population. In this regard, the study and application of electrocardiography becomes extremely relevant in children. In addition, there are no data on the features of ventricular arrhythmias in ACM in the pediatric population. In this systematic review with meta-analysis, we studied the features of ventricular arrhythmias and electrocardiographic parameters in various ACM types.

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Bloemen, Arthur, Anne M. Daniels, Martine G. Samyn, Roel JL Janssen, and Jan-Willem Elshof. "Electrocardiographic-guided tip positioning technique for peripherally inserted central catheters in a Dutch teaching hospital: Feasibility and cost-effectiveness analysis in a prospective cohort study." Journal of Vascular Access 19, no. 6 (March 21, 2018): 578–84. http://dx.doi.org/10.1177/1129729818764051.

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Introduction: Peripherally inserted central catheters are venous devices intended for short to medium periods of intravenous treatment. Positioning of the catheter tip at the cavoatrial junction is necessary for optimum performance of a peripherally inserted central catheter. In this study, safety, effectiveness and cost-effectiveness of electrocardiographic-guided peripherally inserted central catheter positioning in a Dutch teaching hospital were evaluated. Methods: All patients who received a peripherally inserted central catheter in 2016 using electrocardiographic guidance were compared to those where fluoroscopy guidance was used in a prospective non-randomized cohort study. Relevant data were extracted from electronic health records. Cost-effectiveness analysis was performed. Results: A total of 162 patients received a peripherally inserted central catheter using fluoroscopy guidance and 103 patients using electrocardiographic guidance in 2016. No significant difference was found in malposition, infection or other complications between these groups. Due to personnel reduction and omission of fluoroscopy costs, cost reduction for each catheter insertion was €120 in the first year and, as a result of discounted acquisition costs, €190 in subsequent years. Discussion: The positioning results and complication rate are comparable to the previously reported literature. The cost reduction may vary in different hospitals. Other benefits of the electrocardiographic-guided technique are omission of X-ray exposure and improved patient service. Conclusion: Implementation of electrocardiographic-guided tip positioning for peripherally inserted central catheter was safe and effective in this study and led to an improved high value and cost-conscious care.

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Protasova, N. S., and N. V. Krasnikova. "The diagnostic value of electrocardiographic research in myocardial infarction." Kazan medical journal 66, no. 4 (August 15, 1985): 295–96. http://dx.doi.org/10.17816/kazmj61802.

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Bourré-Tessier, Josiane, Murray B. Urowitz, Ann E. Clarke, Sasha Bernatsky, Mori J. Krantz, Thao Huynh, Lawrence Joseph, et al. "Electrocardiographic Findings in Systemic Lupus Erythematosus: Data From an International Inception Cohort." Arthritis Care & Research 67, no. 1 (December 27, 2014): 128–35. http://dx.doi.org/10.1002/acr.22370.

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