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Journal articles on the topic 'Right ventricular systolic time interval'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Zatko, F. J., P. Martin, and R. C. Bahler. "Time course of systolic loading is an important determinant of ventricular relaxation." American Journal of Physiology-Heart and Circulatory Physiology 252, no. 3 (1987): H461—H466. http://dx.doi.org/10.1152/ajpheart.1987.252.3.h461.

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We studied the dependency of left ventricular relaxation on the timing of an abrupt increase in systolic load. In 10 canine isolated heart-lung preparations, a load step of 15 mmHg was imposed at specific intervals throughout systole, and the time of loading was defined as the interval from the R wave to the completion of the load step (R-load interval). Preload was held constant. The right atrium was paced at a cycle length of 450 ms. The decay of left ventricular pressure during isovolumic relaxation was described by a single exponential time constant (Texp). Load effects on isovolumic relax

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Yang, Ling, and Rong Yan. "Correlation between Electrocardiogram Changes and Right Ventricular Systolic Function in Patients with Chronic Atrial Fibrillation." Heart Surgery Forum 27, no. 5 (2024): E528—E532. http://dx.doi.org/10.59958/hsf.7355.

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Background: Chronic atrial fibrillation (CAF) induces various electric disturbances, and a single mutation can cause multifarious phenotypes or combinations. Identifying the correlation of electrocardiogram changes corresponding to the disorders of electrical activity with right ventricular systolic function (RVSF) is important for the treatment and prognosis of CAF. Therefore, this study explored the correlation of electrocardiogram changes and RVSF in patients with CAF. Methods: From March 2022, to March 2023, 97 patients with CAF admitted to the Department of Cardiology of our hospital (stu

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Bodh, Deepti, Mozammel Hoque, and Abhishek Chandra Saxena. "Echocardiographic study of healthy Indian Spitz dogs with normal reference ranges for the breed." Veterinary World 12, no. 6 (2019): 740–47. http://dx.doi.org/10.14202/vetworld.2019.740-747.

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Aim: The present study was aimed to determine the normal reference values of M-mode echocardiographic measurements in healthy Indian Spitz dogs and evaluate the influence of gender and body weight on these measurements. Materials and Methods: M-mode echocardiography was performed in twenty-four clinically healthy conscious Indian Spitz dogs, aged 3-5 years and weighing 7-18 kg. Measurements were made from the right parasternal long axis left ventricular outflow tract view of the heart. The parameters recorded were: Left ventricular internal dimension, interventricular septal thickness and left

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Her, Charles, and Elizabeth A. M. Frost. "Assessment of right ventricular function by right ventricular systolic time intervals in acute respiratory failure." Critical Care Medicine 27, no. 12 (1999): 2703–6. http://dx.doi.org/10.1097/00003246-199912000-00017.

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Lee, Simon, Irene D. Lytrivi, Zhanna Roytman, Hyun-Sook Helen Ko, Cheryl Vinograd, and Shubhika Srivastava. "Cardiomyopathy in children: Can we rely on echocardiographic tricuspid regurgitation gradient estimates of right ventricular and pulmonary arterial pressure?" Cardiology in the Young 26, no. 7 (2016): 1406–13. http://dx.doi.org/10.1017/s1047951116000020.

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AbstractIntroductionAgreement between echocardiography and right heart catheterisation-derived right ventricular systolic pressure is modest in the adult heart failure population, but is unknown in the paediatric cardiomyopathy population.MethodsAll patients at a single centre from 2001 to 2012 with a diagnosis of cardiomyopathy who underwent echocardiography and catheterisation within 30 days were included in this study. The correlation between tricuspid regurgitation gradient and catheterisation-derived right ventricular systolic pressure and mean pulmonary artery pressure was determined. Ag

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Jacobs, Gilbert, and David H. Knight. "M-Mode echocardiographic measurements in nonanesthetized healthy cats: Effects of body weight, heart rate, and other variables." American Journal of Veterinary Research 46, no. 8 (1985): 1705–11. https://doi.org/10.2460/ajvr.1985.46.08.1705.

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SUMMARY Body weight, heart rate, and 19 M-mode echocardiographic variables were measured in 41 nonanesthetized healthy cats. Estimated limits were determined for the echocardiographic variables, and each variable was then correlated to body weight, heart rate, and the 18 other variables. A significant (P < 0.05) positive correlation to body weight was found with aortic diameter, left atrial dimension, septal and left ventricular systolic and left ventricular diastolic wall thicknesses, and left and right ventricular diastolic and right ventricular systolic internal dimensions. Significant i

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Nguyen Quoc, Thai, and Vu Nguyen Anh. "STUDY OF RIGHT VENTRICULAR DP/DT INDEX IN PATIENT WITH MITRAL STENOSIS BY DOPPLER ECHOCARDIOGRAPHY." Volume 8 Issue 3 8, no. 3 (2018): 19–30. http://dx.doi.org/10.34071/jmp.2018.3.3.

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Objectives: To use echocardiographic dP/dt to assess the right ventricular function in patients with mitral stenosis. Subjects and methods: 48 patients with pulmonary hypertension due to mitral stenosis with everage age of 52.75 ± 13.09 years, were hospitalized in Department of Internal Cardiology and Cardiothoracic Department of Hue Central Hospital about time 3/2015 to 7/2017. All of patients had been measured right ventricular dP/dt index by Doppler echocardiograph. The method of research is a cross sectional study. Result: DP/dt should be reduced to the severity of pulmonary hypertension i

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8

Xu, Hongyuan, Jinyi Li, Guoqiang Zhong, et al. "Characteristics of the Dynamic Electrocardiogram in the Elderly with Nonvalvular Atrial Fibrillation Combined with Long R-R Intervals." Evidence-Based Complementary and Alternative Medicine 2021 (November 10, 2021): 1–7. http://dx.doi.org/10.1155/2021/4485618.

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Objective. To investigate the characteristics of dynamic electrocardiogram and their clinical implications in elderly patients with nonvalvular atrial fibrillation combined with long R-R intervals. Methods. Elderly patients diagnosed with nonvalvular atrial fibrillation who were admitted as an inpatient or attended the outpatient department from January 2015 to January 2020 were selected. Patients were divided into two groups based on the presence of a long R-R interval. The characteristics and therapeutic significance of dynamic electrocardiogram between the two groups were compared. Results.

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9

Colombo, Costanza Natalia Julia, Francesco Corradi, Valentino Dammassa, et al. "Time Interval Between Right Ventricular Early Diastolic Velocity by Tissue and Pulse Wave Doppler: An Index of Right Atrial Pressure in Pulmonary Hypertension Patients." Journal of Clinical Medicine 13, no. 21 (2024): 6349. http://dx.doi.org/10.3390/jcm13216349.

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Background: A reversal of time difference between the onset of early diastolic velocity (e’) during tissue Doppler imaging and the onset of mitral inflow (E) has been observed in cases of elevated left atrial pressure. Whether this interval (Te’-E) may be useful to assess right atrial pressure has never been investigated, neither in healthy subjects nor in pulmonary hypertension patients. Methods: Right ventricular Te’-E was assessed in patients with pre-capillary pulmonary hypertension and compared with healthy volunteers who underwent comprehensive echocardiography examination. Te’-E is the

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Her, Charles, Hideo Koike, and James O'Connell. "ESTIMATED RIGHT VENTRICULAR SYSTOLIC TIME INTERVALS FOR THE ASSESSMENT OF RIGHT VENTRICULAR FUNCTION IN ACUTE RESPIRATORY DISTRESS SYNDROME." Shock 31, no. 5 (2009): 460–65. http://dx.doi.org/10.1097/shk.0b013e31818ba1f4.

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11

Hsieh, Kai S., Stephen P. Sanders, Steven D. Colan, Debbie MacPherson, and Cynthia Holland. "Right ventricular systolic time intervals: Comparison of echocardiographic and Doppler-derived values." American Heart Journal 112, no. 1 (1986): 103–7. http://dx.doi.org/10.1016/0002-8703(86)90686-1.

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12

Shaffer, Elizabeth M., A. Rebecca Snider, Gerald A. Serwer, Jane Peters, and Patricia A. Reynolds. "Effect of sampling site on Doppler-derived right ventricular systolic time intervals." American Journal of Cardiology 65, no. 13 (1990): 950–52. http://dx.doi.org/10.1016/0002-9149(90)91452-c.

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Huez, Sandrine, Kathleen Retailleau, Philippe Unger, et al. "Right and left ventricular adaptation to hypoxia: a tissue Doppler imaging study." American Journal of Physiology-Heart and Circulatory Physiology 289, no. 4 (2005): H1391—H1398. http://dx.doi.org/10.1152/ajpheart.00332.2005.

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Hypoxia has been reported to alter left ventricular (LV) diastolic function, but associated changes in right ventricular (RV) systolic and diastolic function remain incompletely documented. We used echocardiography and tissue Doppler imaging to investigate the effects on RV and LV function of 90 min of hypoxic breathing (fraction of inspired O2 of 0.12) compared with those of dobutamine to reproduce the same heart rate effects without change in pulmonary vascular tone in 25 healthy volunteers. Hypoxia and dobutamine increased cardiac output and tricuspid regurgitation velocity. Hypoxia and dob

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Tabata, Tomotsugu, Richard A. Grimm, Junko Asada, et al. "Determinants of LV diastolic function during atrial fibrillation: beat-to-beat analysis in acute dog experiments." American Journal of Physiology-Heart and Circulatory Physiology 286, no. 1 (2004): H145—H152. http://dx.doi.org/10.1152/ajpheart.00588.2003.

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Left ventricular (LV) diastolic function during atrial fibrillation (AF) remains poorly understood due to the complex interaction of factors and beat-to-beat variability. The purpose of the present study was to elucidate the physiological determinants of beat-to-beat changes in LV diastolic function during AF. The RR intervals preceding a given cardiac beat were measured from the right ventricular electrogram in 12 healthy open-chest mongrel dogs during AF. Doppler echocardiography and LV pressure and volume beat-to-beat analyses were performed. The LV filling time (FT) and early diastolic mit

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15

Pahl, Elfriede, and Samuel S. Gidding. "Echocardiographic Assessment of Cardiac Function During Respiratory Syncytial Virus Infection." Pediatrics 81, no. 6 (1988): 830–34. http://dx.doi.org/10.1542/peds.81.6.830.

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Respiratory syncytial virus infection has been associated with increased morbidity and mortality in infants with underlying cardiac and pulmonary disease. To understand better the cardiopulmonary interaction in patients with acute respiratory syncytial virus bronchiolitis, we performed M-mode echocardiograms and pulsed Doppler assessment of pulmonary arterial flow in 19 patients with structurally normal hearts during acute illness. Studies were repeated in 11 of these patients following complete recovery. Based on severity of respiratory compromise, patients were grouped into those with severe

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16

Chirife, Raul, and G. Aurora Ruiz. "216-68: Cardiac Malfunction Detected by Systolic Time Intervals During Right Ventricular Pacing." EP Europace 18, suppl_1 (2016): i158. http://dx.doi.org/10.1093/europace/18.suppl_1.i158c.

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17

GUERRERO, JOSE E., JAVIER MUÑOZ, BRAULIO DE LA CALLE, RICARDO VALERO, and MARIA T. ALBERCA. "Right ventricular systolic time intervals determined by means of a pulmonary artery catheter." Critical Care Medicine 20, no. 11 (1992): 1529–37. http://dx.doi.org/10.1097/00003246-199211000-00009.

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18

Silberbach, G. Michael, Randall L. Imus, Robert W. McDonald, Kerri Andrilenas, Mary J. Rice, and Mark D. Reller. "Effect of patent ductus arteriosus on doppler-derived right ventricular systolic time intervals." Pediatric Cardiology 14, no. 3 (1993): 155–58. http://dx.doi.org/10.1007/bf00795644.

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19

Kim, Hannah S., Ginnie Abarbanell, Kathleen Simpson, et al. "Evolution and Predictors of Right Ventricular Failure in Fontan Patients: A Case-Control Study." Journal of Clinical Medicine 14, no. 13 (2025): 4602. https://doi.org/10.3390/jcm14134602.

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Background: Patients with single right ventricular morphology (SRV) may exhibit impaired function with increased morbidity, mortality, and need for cardiac transplant due to progressive SRV failure after the Fontan procedure. The aim of the study was to longitudinally characterize the cardiac mechanics and trajectory of disease evolution of SRV failure in Fontan patients. Methods: We performed a case-controlled longitudinal study of 52 patients who underwent extracardiac Fontan palliation for SRV between 1994 and 2015 and compared echocardiographic measures of right ventricular (RV) function,

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Lubocka, Paulina, and Robert Sabiniewicz. "What Is the Importance of Electrocardiography in the Routine Screening of Patients with Repaired Tetralogy of Fallot?" Journal of Clinical Medicine 10, no. 19 (2021): 4298. http://dx.doi.org/10.3390/jcm10194298.

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Background: In patients following complete repair of the tetralogy of Fallot, the duration of the QRS complex is associated with the size and mechanical function of the right ventricle, which are contemporarily assessed by cardiac magnetic resonance (CMR). Methods: 38 patients aged 18.0–54.9 years (median age 24.9 years) who had undergone complete repair of the tetralogy of Fallot were examined using CMR and concomitant 24 h ambulatory electrocardiography monitoring. We used statistical analysis to investigate the correlations between electrocardiographic parameters (heart rate, HR; PQ interva

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21

Brailovsky, Yevgeniy, Vladimir Lakhter, Ido Weinberg, et al. "Right Ventricular Outflow Doppler Predicts Low Cardiac Index in Intermediate Risk Pulmonary Embolism." Clinical and Applied Thrombosis/Hemostasis 25 (January 1, 2019): 107602961988606. http://dx.doi.org/10.1177/1076029619886062.

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Intermediate-risk pulmonary embolism (PE) has variable outcomes. Current risk stratification models lack the positive predictive value to identify patients at highest risk of PE-related mortality. We identified intermediate-risk PE patients who underwent catheter-based interventions and right heart catheterization (RHC) and identified those with low cardiac index (CI < 2.2 L/min/m2). We utilized regression models to identify echocardiographic predictors of low CI and Kaplan Meier curve to evaluate PE-related mortality when stratified by the echocardiographic predictor. Of 174 intermediate-r

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Perepeka, Eugene O., Olena M. Trembovetska, Borys B. Kravchuk, Ievgen A. Nastenko, and Maryna M. Sychyk. "Predictors of Pacing-Induced Cardiomyopathy in Patients with Permanent Right Ventricular Pacing and Preserved Left Ventricular Systolic Function." Ukrainian Journal of Cardiovascular Surgery 31, no. 2 (2023): 35–44. http://dx.doi.org/10.30702/ujcvs/23.31(02)/pt024-3444.

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Right ventricular pacing may impair left ventricular systolic function in patients with reduced left ventricular ejection fraction (LVEF). The aim. To determine the frequency of pacing-induced cardiomyopathy (PICM) in patients with permanent right ventricular pacing (at least 90%) and preserved LVEF (≥50%). To determine the risk factors for the occurrence of PICM. Materials and methods. The study included 34 patients with indications for permanent ventricular pacing in whom pacemaker was implanted from 2012 to 2022 (mean follow-up period 44.97 ± 28.45 months). PICM was defined as a

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Tsverava, Mikheil, Dimitri Tsverava, and Sophio Ungiadze. "RIGHT VENTRICULAR OUTFLOW FUNCTION IN ARTERIAL HYPERTENSION." Journal of Hypertension 42, Suppl 1 (2024): e108. http://dx.doi.org/10.1097/01.hjh.0001020388.31068.4f.

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Objective: Anatomically and functionally the Right Ventricle (RV) differs from Left. Its structure is complex, and consists of 2 anatomically and functionally different parts, inflow, and outflow tract. The aim of the research was to study the changes of RV Outflow Tract (RVOT) in patients with Arterial Hypertension (AH) Design and method: We studied 163 patients with AH. RV outflow tract (RVout) was examined by M-mode from parasternal short axis and PW TDI from subcostal position (RWoutTDI). On RVout M-mode we measured diastolic (Dd) systolic diameters (Ds), fractional shortening (RWoutFS= RV

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Wieshammer, Siegfried, Fritz S. Keck, Josef Waitzinger, et al. "Acute hypothyroidism slows the rate of left ventricular diastolic relaxation." Canadian Journal of Physiology and Pharmacology 67, no. 9 (1989): 1007–10. http://dx.doi.org/10.1139/y89-158.

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The effect of acute thyroid hormone deficiency on left ventricular diastolic filling was studied by radionuclide ventriculography with simultaneous right heart catheterization in nine athyreotic patients without cardiovascular disease. The patients were studied when they were hypothyroid and when they were euthyroid on replacement therapy. Peak filling rate and the time to peak filling were used to characterize diastolic function. The time to peak filling was defined as the interval from end-systole on the radionuclide time–volume curve to the time of occurrence of peak filling. The peak filli

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Wang, Yi-Chih, Chih-Chieh Yu, Fu-Chun Chiu, et al. "Acute Effects of Biventricular Pacing in Heart Failure Patients with a Normal Ejection Fraction and Mechanical Dyssynchrony." Cardiology 130, no. 2 (2015): 112–19. http://dx.doi.org/10.1159/000368795.

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Objectives: We tested the acute effects of resynchronization in heart failure patients with a normal (>50%) left ventricular (LV) ejection fraction (HFNEF) and mechanical dyssynchrony. Methods: Twenty-four HFNEF patients (72 ± 6 years, 5 male) with mechanical dyssynchrony (standard deviation of electromechanical time delay among 12 LV segments >35 ms) were studied with temporary pacing catheters in the right atrium, LV, and right ventricle (RV), and high-fidelity catheters for pressure recording. Using selected atrioventricular (AV) intervals of 60, 90, 120, 150, and 180 ms to optimize t

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Ran, Liyu, Wuwan Wang, Francesco Secchi, Yajie Xiang, Wenhai Shi, and Wei Huang. "Percutaneous pulmonary valve implantation in patients with right ventricular outflow tract dysfunction: a systematic review and meta-analysis." Therapeutic Advances in Chronic Disease 10 (January 2019): 204062231985763. http://dx.doi.org/10.1177/2040622319857635.

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Background: Pulmonary valve replacement is required for patients with right ventricular outflow tract (RVOT) dysfunction. Surgical and percutaneous pulmonary valve replacement are the treatment options. Percutaneous pulmonary valve implantation (PPVI) provides a less-invasive therapy for patients. The aim of this study was to evaluate the effectiveness and safety of PPVI and the optimal time for implantation. Methods: We searched PubMed, EMBASE, Clinical Trial, and Google Scholar databases covering the period until May 2018. The primary effectiveness endpoint was the mean RVOT gradient; the se

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Nelle, M., C. Hoecker, and O. Linderkamp. "Effects of red cell transfusion on pulmonary blood flow and right ventricular systolic time intervals in neonates." European Journal of Pediatrics 156, no. 7 (1997): 553–56. http://dx.doi.org/10.1007/s004310050661.

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Botto, Giovanni Luca, Assunta Iuliano, Eraldo Occhetta, et al. "A randomized controlled trial of cardiac resynchronization therapy in patients with prolonged atrioventricular interval: the REAL-CRT pilot study." EP Europace 22, no. 2 (2019): 299–305. http://dx.doi.org/10.1093/europace/euz321.

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Abstract Aims A prolonged PR interval is known to be associated with increased mortality and a higher risk of developing atrial fibrillation (AF). We tested the hypothesis that cardiac resynchronization therapy (CRT) is superior to conventional dual-chamber pacing with algorithms for right ventricular pacing avoidance (DDD-VPA) in preserving systolic and diastolic function and in preventing new-onset AF in patients with normal systolic function, indication for pacing and prolonged atrioventricular conduction (PR interval ≥220 ms). Methods and results We randomly assigned 82 patients with eject

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Johard, Einar, Anna Tidholm, Ingrid Ljungvall, Jens Häggström, and Katja Höglund. "Effects of sedation with dexmedetomidine and buprenorphine on echocardiographic variables, blood pressure and heart rate in healthy cats." Journal of Feline Medicine and Surgery 20, no. 6 (2017): 554–62. http://dx.doi.org/10.1177/1098612x17720327.

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Objectives Sedative agents are occasionally used to enable echocardiographic examination when screening cats for heart disease, such as hypertrophic cardiomyopathy (HCM). Owing to their haemodynamic effects, sedative agents may alter echocardiographic measurements. The aim of the study was to evaluate the effects of the sedative combination dexmedetomidine and buprenorphine on echocardiographic variables, blood pressure (BP) and heart rate (HR) in healthy cats. Methods Fifty healthy, client-owned cats were prospectively recruited and included after physical examination. Cats were sedated intra

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Cantinotti, Massimiliano, Pietro Marchese, Marco Scalese, et al. "Atrial Function Impairments after Pediatric Cardiac Surgery Evaluated by STE Analysis." Journal of Clinical Medicine 11, no. 9 (2022): 2497. http://dx.doi.org/10.3390/jcm11092497.

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Background: Applications of atrial speckle tracking echocardiography (STE) strain (ε) analysis in pediatric cardiac surgery have been limited. This study aims to evaluate the feasibility of atrial STE ε analysis and the progression of atrial ε values as a function of post-operative time in children after pediatric cardiac surgery. Methods: 131 children (mean 1.69 ± 2.98; range 0.01–15.16 years) undergoing cardiac surgery were prospectively enrolled. Echocardiographic examinations were performed pre-operatively and at 3 different post-operative intervals: Time 1 (24–36 h), Time 2 (3–5 days), Ti

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Ayabakan, Canan, and Süheyla Özkutlu. "Normal patterns of flow in the superior caval, hepatic and pulmonary veins as measured using Doppler echocardiography during childhood." Cardiology in the Young 13, no. 2 (2003): 143–51. http://dx.doi.org/10.1017/s1047951103000283.

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To date, no reference values have been provided for right and left atrial filling in normal children. The aim of our study, therefore, was to characterize measurements of superior caval, hepatic, and pulmonary venous flow using Doppler echocardiography in a large group of normal children to reflect the effects of age, body mass index, sex, heart rate and respiration.Doppler echocardiographic examinations of the superior caval, hepatic and pulmonary veins were performed during inspiration and expiration in 72 healthy children with a mean age of 6.73 ± 5.10 years. The subjects were segregated in

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Karasu, Betül Banu, and Hüseyin Ayhan. "Early Impairment of Right Ventricular Functions in Patients with Moderate Asthma and the Role of Isovolumic Acceleration." Koşuyolu Heart Journal 25, no. 2 (2022): 157–64. http://dx.doi.org/10.51645/khj.2022.m207.

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Introduction: Asthma is a common chronic lung disease that affects people all over the world. Pulmonary hypertension and right ventricular (RV) dysfunction are possible complications that may develop in the advanced stages of asthma. However, the number of studies investigating asthma and its implications on new RV parameters are very rare. This study aims to evaluate the RV functions in patients with moderate asthma before the development of pulmonary hypertension. Patients and Methods: Forty-one patients with moderate asthma and 40 healthy individuals were enrolled in this case-control study

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Girija, Haritha, Chinnasamy Sivaprakasam Muthukumaran, Rajaguru Ganesan, et al. "Early and midterm results of Cook Formula stent in children with right heart disease: A single-center experience." Annals of Pediatric Cardiology 17, no. 5 (2024): 347–55. https://doi.org/10.4103/apc.apc_176_24.

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ABSTRACT Background: Branch pulmonary artery (PA) stenosis must be addressed early to prevent right ventricular scarring and establish lung blood flow. Balloon-mounted stents are more useful in managing right ventricular outflow tract (RVOT) obstruction and PA stenosis. Materials and Methods: We studied the clinical and angiographic data of children with congenital heart disease who underwent stenting for RVOT obstruction and branch PA stenosis using the Formula stent (Cook Medical, Limerick, Ireland) between 2018 and 2024 in a tertiary pediatric cardiac center in southern India. Results: Our

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Schaefer, Jacob J., Pavol Sajgalik, Sudhir S. Kushwaha, et al. "Left ventricle assist device pulsatility index at the time of implantation is associated with follow-up pulmonary hemodynamics." International Journal of Artificial Organs 43, no. 7 (2020): 452–60. http://dx.doi.org/10.1177/0391398819899403.

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HeartMate II left ventricular assist device controllers provide data including pulsatility index, reflecting the relationship between pump function and hemodynamics. We propose that a higher pulsatility index at hospital discharge following implant may be associated with less vascular congestion and improved clinical outcomes. A retrospective analysis of 40 patients (age 59.2 ± 10.3 years) supported with the HeartMate II devices was conducted. Data revealed moderate Pearson correlations between pulsatility index at discharge and right atrial pressure, pulmonary artery systolic pressure, pulmon

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Nelle, M., C. Hoecker, and O. Linderkamp. "Effects of packed red cell transfusion on pulmonary blood flow and right ventricular systolic time Intervals in neonates 176." Pediatric Research 40, no. 3 (1996): 544. http://dx.doi.org/10.1203/00006450-199609000-00199.

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Bahler, R. C., and P. Martin. "Effects of loading conditions and inotropic state on rapid filling phase of left ventricle." American Journal of Physiology-Heart and Circulatory Physiology 248, no. 4 (1985): H523—H533. http://dx.doi.org/10.1152/ajpheart.1985.248.4.h523.

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Afterload, activation sequence, inotropism, and extent of shortening affect the time constant (T) of left ventricular (LV) isovolumic pressure decay, yet it is unknown if they modify peak lengthening velocity of the LV minor axis [(dD/dt)/D]. Accordingly, we studied their effects on (dD/dt)/D, measured by sonomicrometry, in nine anesthetized open-chest dogs during atrial pacing at 2 Hz. Afterload was increased 20-40 mmHg by 1) constricting the ascending aorta and 2) occluding the descending aorta for four beats. Activation was altered by right ventricular pacing. These interventions, plus cons

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Yiu-fai, Cheung. "Echocardiographic evaluation of right ventricular function in congenital heart disease." Chinese Medical Journal 127, no. 21 (2014): 3789–97. http://dx.doi.org/10.3760/cma.j.issn.0366-6999.20140476.

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Objective This review aims to provide an overview of conventional and novel indices used in clinical and research arenas for evaluation of right ventricular (RV) function in congenital heart diseases with a dual-chambered circulation. Data sources Articles cited in this review were selected using PubMed search of publications in English with no date limits. The search terms included “echocardiography”, “right ventricle”, “RV function”, “cardiac function”, and “congenital heart disease”. Key references were also searched for additional publications. Study selection Articles related to descripti

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Hu, Jie, Xin Tian, Xiao-Wei Liu, Ya-Zhen Liu, Bu-Lang Gao, and Cai-Ying Li. "Markers of right ventricular dysfunction predict 30-day adverse prognosis of pulmonary embolism on pulmonary computed tomographic angiography." Medicine 102, no. 28 (2023): e34304. http://dx.doi.org/10.1097/md.0000000000034304.

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To investigate the value of parameters of the pulmonary artery and right ventricular function in predicting the 30-day poor prognosis of patients with acute pulmonary embolism (APE). The heart rate, respiratory rate, systolic blood pressure, Wells score for APE, history of recent operation or immobilization, history of cancer, respiratory failure, smoking were significantly (P < .05) different among the control, good prognosis, and poor prognosis groups. The maximal short diameter of the right and left ventricle (RVD/LVD) ratio (P < .001) and left pulmonary artery (LPA) (P = .01) were si

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Akobyan, Tigran. "Graft Flow Assessment with Transthoracic Doppler After Coronary Arterial Bypass Grafting with Bilateral Internal Thoracic Arteries." Clinical Cardiovascular Research 2, no. 1 (2023): 01–05. http://dx.doi.org/10.58489/2836-5917/007.

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Purpose — The aim of our study is to assess the transthoracic Doppler parameters of left internal thoracic artery`s stem (LITA) flow after coronary artery bypass surgery with free right internal thoracic artery using Y graft technique and compare them with such parameters of LITA‐LAD (left anterior descending) graft flow after regular coronary artery bypass surgery (CABG). Material and Methods — 51 consecutive patients with coronary artery disease underwent CABG. Comparison between groups was performed using the following parameters: age, body mass index, angina class, presence of hypertension

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Piccione, Maurizio Cusmà, Luigi Colarusso, Eustachio Agricola, et al. "How to Do Echo for Noninvasive Hemodynamic Evaluation of the Patient in the Intensive Care Unit: A Consensus Statement of the Italian Society of Echocardiography and Cardiovascular Imaging." Journal of Cardiovascular Echography 35, no. 1 (2025): 79–90. https://doi.org/10.4103/jcecho.jcecho_15_25.

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Critically ill patients in the intensive care unit (ICU) require continuous hemodynamic monitoring to guide therapeutic decisions and prevent clinical deterioration. Echocardiography has emerged as a cornerstone for noninvasive hemodynamic assessment, offering real-time, bedside evaluation of key parameters such as venous congestion, pulmonary pressures, left atrial pressure (LAP), systemic vascular resistances, cardiac output, and ventricular–arterial coupling. Systemic venous congestion and right atrial pressure (RAP) can be assessed through inferior vena cava diameter measurement and respir

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Venkataraman, Pankaja S., Don A. Wilson, Roger E. Sheldon, Radhakrishna Rao, and Michael K. Parker. "Effect of Hypocalcemia on Cardiac Function in Very-Low-Birth-Weight Preterm Neonates: Studies of Blood Ionized Calcium, Echocardiography, and Cardiac Effect of Intravenous Calcium Therapy." Pediatrics 76, no. 4 (1985): 543–50. http://dx.doi.org/10.1542/peds.76.4.543.

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Traditionally, in infants, a serum calcium value less than 7.0 mg/dL is considered to impair cardiac function. In very-low-birth-weight infants, we studied the hypotheses that decline in serum calcium to 6.0 mg/dL (1) would not impair cardiac function and (2) ionized calcium would remain greater than 3.0 mg/dL. We also evaluated the effect of calcium infusion on cardiac function. We studied 15 normokalemic and normonatremic infants whose birth weights were 822 to 1,450 g and were less than 32 weeks' gestation. When serum calcium declined to less than 6.0 mg/dL, 18 mg/kg of calcium as 5% calciu

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Hatipoglu, Suzan, Peter Gatehouse, Sylvia Krupickova, et al. "Reliability of pediatric ventricular function analysis by short-axis “single-cycle-stack-advance” single-shot compressed-sensing cines in minimal breath-hold time." European Radiology 32, no. 4 (2021): 2581–93. http://dx.doi.org/10.1007/s00330-021-08335-5.

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Abstract Objectives Cardiovascular magnetic resonance (CMR) cine imaging by compressed sensing (CS) is promising for patients unable to tolerate long breath-holding. However, the need for a steady-state free-precession (SSFP) preparation cardiac cycle for each slice extends the breath-hold duration (e.g. for 10 slices, 20 cardiac cycles) to an impractical length. We investigated a method reducing breath-hold duration by half and assessed its reliability for biventricular volume analysis in a pediatric population. Methods Fifty-five consecutive pediatric patients (median age 12 years, range 7–1

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Steen, T., B. M. Voss, and O. A. Smiseth. "Influence of heart rate and left atrial pressure on pulmonary venous flow pattern in dogs." American Journal of Physiology-Heart and Circulatory Physiology 266, no. 6 (1994): H2296—H2302. http://dx.doi.org/10.1152/ajpheart.1994.266.6.h2296.

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In six open-chest anesthetized dogs we investigated the effect of heart rate (HR) on the relationship between left atrial pressure (LAP) and pulmonary venous flow (QPV). QPV was measured by ultrasonic transit time during volume loading and right atrial pacing. Consistent with previous studies, we found a negative correlation between LAP and mean flow rate during atrial systole divided by mean flow rate in the R-R interval. However, this relationship was shifted upward by tachycardia. The QPV maximum amplitude divided by mean flow rate in the R-R interval increased with loading but decreased wi

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Tangney, Jared R., Stuart G. Campbell, Andrew D. McCulloch, and Jeffrey H. Omens. "Timing and magnitude of systolic stretch affect myofilament activation and mechanical work." American Journal of Physiology-Heart and Circulatory Physiology 307, no. 3 (2014): H353—H360. http://dx.doi.org/10.1152/ajpheart.00233.2014.

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Dyssynchronous activation of the heart leads to abnormal regional systolic stretch. In vivo studies have suggested that the timing of systolic stretch can affect regional tension and external work development. In the present study, we measured the direct effects of systolic stretch timing on the magnitude of tension and external work development in isolated murine right ventricular papillary muscles. A servomotor was used to impose precisely timed stretches relative to electrical activation while a force transducer measured force output and strain was monitored using a charge-couple device cam

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Meral Gunes, Adalet, Melike Sezgin Evim, Özlem Mehtap Bostan, Aysel Kaderli та Birol Baytan. "The Role of Cardiovascular T2*MRI and Tissue Doppler Measurement in Assesment of Cardiac Status in β-Thalassemia Major". Blood 124, № 21 (2014): 1363. http://dx.doi.org/10.1182/blood.v124.21.1363.1363.

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Abstract Introduction: Early detection of myocardial dysfunction and modification of treatment may prevent from progressing into the end stage heart failure and lethal arrhythmias in beta-thalassemia major (β-TM). T2* magnetic resonance imaging (MRI), a non-invasive technic determining iron accumulation in myocardium has been widespreadly used in these patients. Cardiac T2* MRI is not capable to evaluate cardiac functions but, indicates patients with risk for developing cardiac disease. Therefore, combining T2*MRI with tissue Doppler (TD) echocardiography, another technic defining both functio

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Lisicka, Monika, Marta Skowrońska, Bartosz Karolak, Jan Wójcik, Piotr Pruszczyk, and Piotr Bienias. "Heart Rate Variability Impairment Is Associated with Right Ventricular Overload and Early Mortality Risk in Patients with Acute Pulmonary Embolism." Journal of Clinical Medicine 12, no. 3 (2023): 753. http://dx.doi.org/10.3390/jcm12030753.

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The association between heart rate variability (HRV) and mortality risk of acute pulmonary embolism (APE), as well as its association with right ventricular (RV) overload is not well established. We performed an observational study on consecutive patients with confirmed APE. In the first 48 h after admission, 24 h Holter monitoring with assessment of time‑domain HRV, echocardiography and NT‑proBNP (N-terminal pro‑B‑type natriuretic peptide) measurement were performed in all participants. We pre‑examined 166 patients: 32 (20%) with low risk of early mortality, 65 (40%) with intermediate–low, 65

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Hata, T. "M-mode echocardiographic and electrocardiographic assessments of fetal right and left ventricular systolic time intervals during antenatal and early neonatal periods." Journal of Obstetrics and Gynaecology 7, no. 3 (1987): 181–86. http://dx.doi.org/10.3109/01443618709068511.

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Nitsche, Christian, Andreas A. Kammerlander, Christina Binder, et al. "Native T1 time of right ventricular insertion points by cardiac magnetic resonance: relation with invasive haemodynamics and outcome in heart failure with preserved ejection fraction." European Heart Journal - Cardiovascular Imaging 21, no. 6 (2019): 683–91. http://dx.doi.org/10.1093/ehjci/jez221.

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Abstract Aims Increased afterload to the right ventricle (RV) has been shown to induce myocardial fibrosis at the RV insertion points (RVIPs). Such changes can be discrete but potentially detected by cardiac magnetic resonance (CMR) T1-mapping. Whether RVIP fibrosis is associated with prognosis in heart failure with preserved ejection fraction (HFpEF) is unknown. Methods and results We prospectively investigated 167 consecutive HFpEF patients, a population frequently suffering from post-capillary pulmonary hypertension, who underwent CMR including T1-mapping. About 92.8% also underwent right h

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Wainstein, Rodrigo V., Zion Sasson, and Susanna Mak. "Frequency-dependent left ventricular performance in women and men." American Journal of Physiology-Heart and Circulatory Physiology 302, no. 11 (2012): H2363—H2371. http://dx.doi.org/10.1152/ajpheart.01125.2011.

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We aimed to determine whether sex differences in humans extend to the dynamic response of the left ventricular (LV) chamber to changes in heart rate (HR). Several observations suggest sex influences LV structure and function in health; moreover, this physiology is also affected in a sex-specific manner by aging. Eight postmenopausal women and eight similarly aged men underwent a cardiac catheterization-based study for force-interval relationships of the LV. HR was controlled by right atrial (RA) pacing, and LV +dP/d tmax and volume were assessed by micromanometer-tipped catheter and Doppler ec

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Hu, Na, Na Yi, and Huiqiong Yang. "Effect Evaluation of Cardiac Resynchronization Therapy in Elderly Patients with Heart Failure by Ultrasound Image under QuickOpt Algorithm." Computational and Mathematical Methods in Medicine 2022 (June 7, 2022): 1–10. http://dx.doi.org/10.1155/2022/8680446.

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This research was aimed at analyzing the application value of echocardiography and QuickOpt algorithm in optimizing parameters of cardiac resynchronization therapy (CRT) in elderly patients with heart failure. 50 elderly patients who were diagnosed with chronic heart failure and underwent CRT were chosen as the research objects. According to the different optimization methods, the patients were divided into the echocardiography group and QuickOpt algorithm group, 25 cases in each group. The general data, optimized intervals, corresponding maximum aortic velocity time integrals (aVTIs), cardiac

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