Academic literature on the topic 'Troponina T'
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Journal articles on the topic "Troponina T"
Correia, Luis Cláudio Lemos, Fábio L. Sodré, José C. C. Lima, Michael Sabino, Mariana Brito, Guilherme Garcia, Mayara Maraux, Alexandre C. Sousa, Márcia Noya Rabelo, and J. Péricles Esteves. "Valor prognóstico da troponina I de alta sensibilidade versus troponina T nas síndromes coronarianas agudas." Arquivos Brasileiros de Cardiologia 98, no. 5 (May 2012): 406–12. http://dx.doi.org/10.1590/s0066-782x2012005000034.
Full textVelilla Moliner, Joaquín, Daniel Lahoz Rodríguez, Antonio Giménez Valverde, and Eduardo Bustamante Rodríguez. "Detección de troponina T ultrasensible en pacientes con riesgo cardiovascular." Revista Española de Cardiología 70, no. 7 (July 2017): 615. http://dx.doi.org/10.1016/j.recesp.2017.01.018.
Full textYasri, Sora, and Viroj Wiwanitkit. "Troponina-T e Peptídeo Natriurético tipo B na COVID-19." Arquivos Brasileiros de Cardiologia 116, no. 4 (April 2021): 854. http://dx.doi.org/10.36660/abc.20201191.
Full textAlquézar Arbé, Aitor, Miguel Santaló Bel, and Alessandro Sionis. "Interpretación clínica de la determinación de troponina T de elevada sensibilidad." Medicina Clínica 145, no. 6 (September 2015): 258–63. http://dx.doi.org/10.1016/j.medcli.2014.11.004.
Full textÁlvarez Nozal, Isabel, Héctor García Pardo, and Diego Martín Raymondi. "Detección de troponina T ultrasensible en pacientes con riesgo cardiovascular. Respuesta." Revista Española de Cardiología 70, no. 7 (July 2017): 616. http://dx.doi.org/10.1016/j.recesp.2017.02.025.
Full textCalvo-Cuervo, David, Vicente Barriales-Álvarez, José M. Vegas-Valle, and María Martín-Fernández. "Falsa determinación de troponina T en el contexto de enfermedades inmunológicas." Medicina Clínica 127, no. 11 (September 2006): 437. http://dx.doi.org/10.1157/13092772.
Full textBasquiera, Ana L., Ricardo Capra, Mirtha Omelianiuk, Marcos Amuchástegui, Roberto J. Madoery, and Oscar A. Salomone. "Concentraciones séricas de troponina T en pacientes con enfermedad de Chagas crónica." Revista Española de Cardiología 56, no. 7 (January 2003): 742–44. http://dx.doi.org/10.1016/s0300-8932(03)76947-4.
Full textPastor, Gemma, José Alberto San Román, José Luis Vega, Ana María Serrador, Valeriu Epureanu, Raquel Teresa Palomino, Olga Sanz, et al. "Ecocardiografía de estrés con dobutamina y troponina T como marcador de daño miocárdico." Revista Española de Cardiología 55, no. 5 (January 2002): 469–73. http://dx.doi.org/10.1016/s0300-8932(02)76637-2.
Full textGimeno, Juan R., Lorenzo Monserrat, Inmaculada Pérez-Sánchez, Francisco Marín, Luis Caballero, Manuel Hermida-Prieto, Alfonso Castro, and Mariano Valdés. "Miocardiopatía hipertrófica. Estudio del gen de la troponina T en 127 familias españolas." Revista Española de Cardiología 62, no. 12 (December 2009): 1473–77. http://dx.doi.org/10.1016/s0300-8932(09)73136-7.
Full textÁlvarez, Isabel, Luis Hernández, Héctor García, Vicente Villamandos, María Gracia López, Jorge Palazuelos Molinero, and Diego Martín Raymondi. "Troponina T ultrasensible en pacientes asintomáticos de muy alto riesgo cardiovascular. Registro TUSARC." Revista Española de Cardiología 70, no. 4 (April 2017): 261–66. http://dx.doi.org/10.1016/j.recesp.2016.08.018.
Full textDissertations / Theses on the topic "Troponina T"
Malnic, Bettina. "Expressão do complexo troponina em E. coli e mapeamento dos domínios funcionais da troponina T." Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-03042012-121955/.
Full textThe contraction of skeletal muscle is regulated by troponin and tropomyosin in a Ca2+ dependent manner. The troponin complex consists of three subunits: troponin C (TnC), troponin I (TnI) and troponin T (TnT). Troponin C is the Ca2+ binding subunit, TnI is the inhibitory subunit and TnT binds tightly to tropomyosin. TnI and TnT are highly insoluble proteins at low ionic strengths, unless they are complexed with TnC. The troponin complex can be reconstituted \"in vitro\" from the isolated subunits simply by mixing the subunits at equimolar ratios in urea, which is then removed by dialysis. In the first part of this work a vector for the co-expression of TnC, TnI and TnT in E.coli was constructed. Using this vector we were able to produce a functional troponin complex assembled \"in vivo\" in the E.coli cytoplasm The presence of TnT is required for the Ca2+ dependente regulation of the skeletal muscle contraction. The role of TnT in conferring full Ca2+ sensitivity to the ATPase activity of acto-myosin was analyzed. Deletion mutants of TnT were constructed by site-directed mutagenesis and expressed in E.coli. Troponin complexes containing the TnT deletion mutants and/or TnI deletion mutants, were reconstituted and analyzed in thin filament binding assays and in ATPase activity assays. Based on these studies, TnT was subdivided into three domains: the activation domain (comprised of aminoacids 1-157), the inhibitory domain (comprised of amino acids 157-216) and the TnC/TnI dimer anchoring domain (aminoacids 216-263). We demonstrated that the TnC/TnI is anchored to the thin filament through interaction between the amino-terminal domain of TnI and the region comprised of aminoacids 216-263 of TnT. A model for the role of TnT in the Ca2+ dependent regulation of muscle contraction is proposed.
Oliveira, Daniela Mara de. "Mapeamento e caracterização do domínio ativatório da Troponina T." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-19112014-165958/.
Full textThe Ca2+-regulation of the actomyosin ATPase activity at physiological ratios of actin, tropomyosin and troponin occurs only in the presence of troponin T. Our group has previously demonstrated that a recombinant polypeptide corresponding to the first 191 amino acids of TnT (TnTl-191) activates the aetomyosin Mg2+-ATPase activity in the presence of tropomyosin and in the absence of TnI/TnC. In order to further map and characterize this activation domain, we constructed a set of recombinant or synthetic TnT fragments, corresponding to amino acids 1-157 (TnTl-157), 1-76 (TnTl-76), 77-57 (TnT77-157), 77-191 (TnT77-191) and 158-191 (TnT158-191). Binding assays using these fragments demonstrated that: i) amino acids 1-76 of TnT do not bind to tropomyosin or actin; ii) amino acids 158-191 bind to actin cooperatively, but not to tropomyosin; iii) the sequence 77-157 is necessary for TnT\'s interaction with residue 263 of tropomyosin; iv) TnT77-191 on its own activates de actomyosin ATPase activity to the same extent as previously described for TnTl-191. TnT1-157; TnTl-76; TnT77-157; TnT158-191 and combinations of TnT158-191 with TnTl-157 or TnT77-157 showed no effect on the ATPase activity. We conclude that interactions of amino acids 77-191 of TnT with tropomyosin and actin are essential for the activation of actomyosin ATPase activity, and that this activation may be mediated in part by a direct interaction between TnT residues 158-191 and actin.
GOMES, FILHO Sérgio Luiz da Rocha. "Aptassensor eletroquímico para detecção de troponina cardíaca T (cTnT), um marcador para infarto agudo do miocárdio." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16727.
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O infarto agudo do miocárdio (IAM) representa hoje um dos maiores problemas de saúde mundial prevalecendo sobre doenças como câncer, AIDS e doenças respiratórias. Em virtude da relevância, métodos cada vez mais eficientes para auxilio no diagnóstico do IAM vem sendo desenvolvidos. Um destes métodos, os aptassensores, chegam como ferramenta analítica alternativa para detecção de marcadores de necrose miocárdica. Neste trabalho um aptassensor simples e livre de marcação foi desenvolvido para detecção de troponina T cardíaca (cTnT), para isto, nanopartículas de prata foram sintetizadas eletroquimicamente sobre eletrodos impressos de tinta de carbono. Em seguida, 5 μL de cisteína foi adicionada à superfície sensora com intuito de servir de braço químico e possibilitar a imobilização do aptâmero. O aptâmero usado consiste em DNA fita simples modificado com grupos amino (NH2-ssDNA) e específico para o analito em questão. As condições ideais para imobilização do aptâmero e reconhecimento da molécula alvo, assim como a caracterização eletroquímica do aptassensor, foram investigados através das técnicas de voltametria cíclica (CV) e voltametria de pulso diferencial (DPV). A especificidade do aptassensor foi investigada utilizando para isso moléculas alvo específicas e inespecíficas. O reconhecimento do alvo apresentou alta sensibilidade com limite de detecção em 0,1 ng mL−1 de cTnT e uma boa reprodutibilidade (CV = 4%). O sensor também foi testado com amostras de soro humano, apresentando ótima concordância (95% de nível de confiança) com o padrão ouro, o método ECLIA. Neste trabalho pôde-se constatar que as nanopartículas de prata incorporadas a superfície eletródica melhoraram a reprodutibilidade, a condutividade e, consequentemente a resposta sensora, enquanto os aptâmeros asseguraram a sensibilidade e especificidade do aptasensor, apresentando, este modelo, grande potencial para uso no monitoramento dos níveis séricos de troponina cardíaca.
Acute myocardial infarction (AMI) it is one of the most serious diseases in the world responsible for approximately 17 million of deaths in 2012. Therefore, early diagnosis and prompt medical response are of paramount importance for patient survival. Aptasensors can be an alternative, which in combination with electrochemical techniques can provide the simplicity and speed required. A simple and sensitive label-free aptasensor for cardiac troponin T (cTnT) detection was successfully developed. For this purpose, it was chosen a DNA aptamers modified with amino group (NH2-ssDNA) specific to bind cTnT with a high specificity and stability. Herein, silver nanoparticles electrochemically synthesized and cysteine were used to modify the electrode, providing binding sites for aptamer immobilization. The optimum conditions for immobilization of the aptamer and target recognition were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) technique. The aptasensor achieved a low limit of detection (0.3 ng mL−1) and a linear range between 0.1 and 10 ng mL−1 cTnT, significant for acute myocardial infarction diagnosis. Good reproducibility was obtained by the proposed aptasensor supported by a coefficient of variation of 4%. The silver nanoparticles incorporated to the electrode surface improved the reproducibility, while the aptamer secured the sensitivity of the biosensor. The sensor was also tested for human serum samples presenting a good agreement with the ECLIA methods at 95% confident level. This point-of-care approach presents a great potential for use in several situations releasing the aptasensor for use in the cardiac troponin detection.
Freitas, Tatianny de Assis. "Desenvolvimento de eletrodos baseados em carbono para determinação da troponina T cardíaca humana." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/12163.
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A troponina T (TnT) é um marcador cardíaco considerado "padrão ouro" para o diagnóstico do infarto agudo do miocárdio, devido a sua alta sensibilidade e especificidade. Métodos analíticos para melhorar o diagnóstico desta doença são importantes para o tratamento adequado dos pacientes. Atualmente, as técnicas baseadas em imunoensaios são as mais utilizadas para diagnóstico clínico e determinação da TnT à beira do leito. Entretanto, apresentam algumas limitações como procedimentos complicados para análise e um elevado tempo de espera do resultado. Neste contexto, os imunossensores surgem como uma atrativa ferramenta, de baixo custo, com alta sensibilidade e especificidade para determinação da TnT. Nesta tese, dois diferentes imunossensores eletroquímicos foram desenvolvidos para a detecção da TnT em soro humano. O primeiro imunossensor foi baseado em um método simples de amino-funcionalização de nanotubos de carbono empregado para promover uma imobilização dos anticorpos anti-TnT através de sua região Fc e sua ligação orientada ao antígeno TnT. Os nanotubos de carbono de múltiplas paredes foram amino-funcionalizados utilizando o reagente etilenodiamina e os ensaios foram realizados através de um estudo fatorial associado com uma matriz de Doehlert. As modificações estruturais dos nanotubos de carbono foram confirmadas através da espectroscopia de infravermelho por transformada de Fourrier. Para detecção eletroquímica deste imunossensor, eletrodos impressos descartáveis de carbono foram utilizados e então modificados com estes nanotubos de carbono amino-funcionalizados. Um imunoensaio tipo "sanduíche" foi realizado, no qual a captura específica da TnT foi avaliada através das reações redox da enzima peroxidase conjugada ao segundo anticorpo anti-TnT. Sob condições experimentais otimizadas, uma curva de calibração para as diferentes concentrações de TnT foi obtida com faixa linear de resposta entre 0,02 e 0,32 ng mL-1 (r=0,985, n=5, p<0.001) e um limite de detecção de 0,016 ng mL-1. O segundo imunossensor foi baseado na formação de um filme polimérico sobre um eletrodo de carbono vítreo para imobilização de anticorpos anti-TnT. O ácido orto-aminobenzóico (o-ABA) foi eletropolimerizado sobre a superfície do eletrodo e empregado para fornecer grupamentos carboxílicos à superfície e permitir a ligação covalente de anticorpos anti-TnT. O eletrodo apresentou-se estável mantendo 91,6% da sua resposta inicial após 18 dias e apresentou um limite de detecção de 0,015 ng mL-1 de TnT. Os imunossensores desenvolvidos foram sensíveis, permitindo medidas confiáveis da TnT para o diagnóstico do infarto agudo do miocárdio na clínica médica.
Puche, Morenilla Carmen María. "Papel de los biomarcadores en pacientes con dolor torácico y troponina T ultrasensible negativa." Doctoral thesis, Universidad de Murcia, 2014. http://hdl.handle.net/10803/284647.
Full textThe hypothesis of this study was the determination of PIGF as a marker of angiogenesis, IL-6 as a marker of inflammation and ultrasensitive copeptin as a marker of endogenous stress may help improve diagnostic and prognostic accuracy of acute coronary syndrome. The objectives of this study were: 1. To characterize patients presenting with chest pain consistent by myocardial ischemia and negative Tn-hs to the emergency room of the hospital. 1.1 To evaluate the usefulness of clinical variables in the diagnosis and prognosis of these patients. 2. Studying the values of IL-6, ultrasensitive copeptin and PIGF in these patients. 2.1. Compare values of different biomarkers in patients with stable angina and patients with chest pain without evidence of ischemia. 2.2. To study the association of demographic and clinical characteristics with the biomarkers in these patients. 2.3 To study the influence of renal function on different biomarkers. 3 Assess whether the measurement of biomarkers IL-6, PIGF and ultrasensitive copeptin in such patients, improve the diagnostic accuracy of unstable angina. 4 To determine the prognostic influence on the occurrence of adverse events of biomarkers analyzed in patients with chest pain and negative Tn-hs. This is a prospective and longitudinal study involving patients presenting to the emergency department with chest pain and suspected ACS in the Universitary Hospital Virgen de la Arrixaca, Murcia. Patients were collected in the period from November 2009 to May 2013 and samples were processed in the laboratory of Clinical Analysis of the University Hospital Virgen de la Arrixaca, Murcia. The total population included in the study was 287 patients presenting to the emergency department with chest pain of suspected cardiac origin without major electrocardiographic changes or elevation of Tn. Of these, 229 were classified as patients with chest pain without evidence of ischemia and 58 as patients with unstable angina. For the purposes of this study, we included the measurement of interleukin-6 (IL-6), placental growth factor (PIGF) and ultrasensitive copeptin in the sample taken from the patient at the admission and after 4-6 hours. Conclusion 1: Patients presenting to the emergency department with chest pain suggestive of ischemia and normal ultrasensitive troponin T are not free of risk of event at follow-up, highlighting the need for risk stratification strategy for this group of patients. In this population, the diabetes, the maximum heart rate obtained from the stress test and the presence of two or more episodes of angina in the 24 hours prior to admission were shown to be predictors of the diagnosis of unstable angina. The presence of coronary disease in patients with chest pain and ultrasensitive troponin T standard is independently associated with the occurrence of adverse events at follow-up. Conclusion 2: In patients with unstable angina, IL-6 and high sensitivity copeptin have higher serum concentrations than patients with chest pain without evidence of ischemia. Copeptin ultrasensitive has a pattern of release different at the rest of the biomarkers studied, showing a peak in the first hours after the onset of ischemic symptoms suggestive although troponin is not high. The values of IL-6 were higher in patients older than 65 years, hypertension and with three or more cardiovascular risk factors. Copeptin ultrasensitive values were higher in men. For PIGF, higher values occurred in patients older than 65 years, hypertension and non smokers. Kidney function is better in non-hypertensive patients and smokers. A negative correlation of the values obtained from the equations of kidney function with the values of observed biomarkers. Conclusion 3: A multimarker strategy defined by IL-6 and ultrasensitive copeptin was shown to be an independent predictor of diagnosis of AI in our population. Conclusion 4: In patients with suspected ACS, only the determination of ultrasensitive copeptin was independently associated with the occurrence of adverse events defined as unstable angina, or death from any cause.
Maeda, Mariane de Fátima Yukie. "Cardiotocografia computadorizada e dopplervelocimetria em gestações com insuficiência placentária: associação com a lesão miocárdica fetal e a acidemia no nascimento." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/5/5139/tde-17012014-121048/.
Full textObjective: To evaluate the reliability of fetal heart rate parameters analyzed by computerized cardiotocography (cCTG) and fetal Doppler to predict myocardial damage and acidemia at birth in pregnancies complicated by placental insufficiency. Methods: Forty nine patients with placental insufficiency (abnormal umbilical artery Doppler - pulsatility index [PI] > p95) diagnosed between 26-34 weeks of gestation were prospectively studied. All patients were submitted to Dopplervelocimetry of umbilical artery, middle cerebral artery and ductus venosus and to the cCTG (Sonicaid Fetal Care, version 2.2; 30 minutes of duration). We analyzed the last fetal assessment 48h before delivery and prior to steroid therapy.Umbilical cord blood samples were collected at birth to detect acidemia (pH < 7.20) and myocardial damage (cTnT >= 0.09 ng/ml). The results of cTnT were available in 38 cases and in 46 cases we had the pH values. Results: Fifteen (39.5%) newborns had cTnT >= 0.09 ng/ml and 20 (43.5%) had a pH < 7.20. Fetuses who developed acidemia had fewer fetal movements per hour in cCTG (median 2 vs. 15, P=0.019). There was a positive correlation between pH and the number of fetal movements per hour (rho 0.35, P=0.019) and basal fetal heart rate (rho 0.37, P=0.011), and a negative correlation between pH and the zscore of pulsatility index for veins (PIV) of ductus venosus (rho= -0.31, P=0.036). The logistic regression analysis identified the z-score of PIV of ductus venosus (P=0.023) and basal fetal heart rate (P=0.040) as independent variables associated with acidemia at birth. The occurrence of fetal myocardial injury was significantly associated with z-score of PI of umbilical artery (median 8.8 vs. 4.0, P=0.003), PIV of ductus venosus (median 2.6 vs. -1.4, P=0.007), basal fetal heart rate (median 146 vs. 139 bpm, P=0.033), number of accelerations between 10-15 bpm (median 0 vs. 1, P=0.013), duration of episodes of low variation (median 21 vs. 10 min, P=0.038) and short-term variation (STV) (median 3.7 vs. 6.1 ms, P=0.003). We observed a positive correlation between the value of cTnT in the umbilical cord and basal fetal heart rate (rho=0.33, P=0.042), and a negative correlation between cTnT and STV (rho=-0.37, P=0.021). Logistic regression identified the STV as an independent predictor for myocardial damage (P=0.01), and STV <= 4.3 ms was the best cutoff to predict the event (sensitivity 66.7% and specificity of 91.3%). Conclusion: In pregnancies with placental insufficiency detected before the 34th week of gestation, the PIV of ductus venosus and basal fetal heart rate analyzed by cCTG are independent variables associated with acidemia at birth; and the STV is the parameter that best predicts fetal myocardial injury. The cCTG is an important tool in the management of fetuses with placental insufficiency, especially when associated with other diagnostic methods such as Doppler
Poppi, Nilson Tavares. "Estudo prospectivo em angina refratária: evolução clínica e o papel da troponina ultrassensível." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-06112015-155028/.
Full textBACKGROUND: Approximately 10% of patients with symptomatic coronary artery disease (CAD) suffer from refractory angina, a chronic condition caused by coronary insufficiency which cannot be controlled by a combination of medical therapy, angioplasty and coronary bypass surgery. The predictors of cardiovascular events in this growing group of patients are limited. High-sensitivity cardiac troponin T (hs-cTnT) assays are valuable biomarkers that may be used to determine the prognosis of patients with stable CAD, but there is no evidence that this ability would be retained in individuals with more severe and extensive disease, as is the case in refractory angina. The aims of this study are to evaluate the effectiveness of a maximally tolerated medical therapy, the predictors of death and nonfatal myocardial infarction (MI), as well as the role of hs-cTnT as a prognostic tool in this setting. METHODS: We prospectively enrolled 117 consecutive patients (83 men, 62.7 ± 9.4 years) in this study between October 2008 and September 2013. All patients had angina as classified by the Canadian Cardiovascular Society (CCS) II to IV at their first visit, and evidence of myocardial ischemia via any stress test. A heart team ruled out myocardial revascularization feasibility after assessing recent coronary angiograms. Optimal medical therapy was up-titrated over three months. Patients were followed every 6 months via outpatient visits; plasma hs-cTnT levels were determined at baseline and after three months. The primary endpoint was the composite incidence of death and nonfatal MI. RESULTS: There were high prevalence of three-vessel CAD (75.2%), angina CCS class III or IV (60.7%) and history of previous myocardial revascularization (91.5%); most of the patients had preserved left ventricular function (61.5%). Hs-cTnT values were either at or above the limit of detection (3 ng/L) in 79.5% of patients and we noted concentrations either at or greater than the 99th percentile of healthy individuals (14 ng/L) in 27.4% of patients. The independent predictors of higher concentrations of hs-cTnT were as follows: left ventricular dysfunction, no calcium channel blocker use at baseline, elevated systolic blood pressure and reduced glomerular filtration rate. The improvement of at least one CCS functional class occurred in 50% of patients (P < 0.001) and 25.9% were free from angina or were CCS I after three months of medical therapy. There was a significant reduction in the number of angina attacks (P < 0.001) and a reduction in short-acting nitrate consumption (P = 0.029). There was no reduction in hs-cTnT levels after the three-month medical therapy optimization. During a median follow-up period of 28.0 months (interquartile range, 18.0 to 47.5 months), an estimated 28.0-month cumulative event rate of 13.4% (5.8% for allcause death) was determined via the Kaplan-Meier method. Univariate predictors of the composite endpoint were as follows: hs-cTnT levels and left ventricular dysfunction. Following a multivariate analysis via a Cox proportional-hazards regression model, only hs-cTnT was independently associated with the events in question, either as a continuous variable (HR per unit increase in the natural logarithm, 2.83; 95% CI, 1.62 to 4.92; P < 0.001) or as a categorical variable (HR for concentrations above the 99th percentile, 5.14; 95% CI, 2.05 to 12.91; P < 0.001). CONCLUSIONS: In patients initially diagnosed with refractory angina, the optimal medical therapy protocol was well tolerated and effective in reducing the symptoms of angina in most patients. However, such clinical improvement was not accompanied by a decrease in plasma concentrations of high-sensitivity troponin T, a biomarker that our study identified as the strongest predictor of death and nonfatal myocardial infarction in patients with refractory angina. The incidence of cardiovascular events in this study was lower than that previously reported, leading to outcomes approaching those of patients with complex coronary artery disease who are suitable for myocardial revascularization
MATTOS, Alessandra Batista de. "Determinação da troponina T cardíaca humana empregando sistema de microbalança de quartzo por injeção de fluxo." Universidade Federal de Pernambuco, 2007. https://repositorio.ufpe.br/handle/123456789/1774.
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As determinações da troponina cardíaca T (TnT) podem contribuir para o diagnóstico e tratamento de infarto agudo do miocárdio e para a estratificação dos riscos dos pacientes com síndromes coronárias agudas no que respeita ao risco relativo de mortalidade. Neste trabalho, um sistema de microbalança de quartzo por injeção de fluxo baseado na alteração de freqüência elétrica em resposta à ligação antígeno-anticorpo foi empregado para determinação da TnT cardíaca. As variações de freqüências foram registradas por um contador de freqüência acoplado a um microcomputador. O anticorpo monoclonal específico foi imobilizado sobre a superfície de um eletrodo de cristal de quartzo por ligação irreversível via monocamadas auto-organizadas. O adsorbato composto por filme de alcanotiól foi formado incubando uma solução de 2-aminoetanotiol (cisteamina) por 2 h, seguido por glutaraldeído a 2,5% (v/v). Em seguida, anticorpos monoclonais anti- troponina T (anti-TnT) foram covalentemente imobilizados sobre o eletrodo de ouro do cristal de quartzo e foi usada uma solução de glicina (10mM) como agente bloqueante. Com o imunossensor desenvolvido foi possivel medir concentrações de troponina T com limite de detecção de 0,025 ng/mL. A superfície do sensor pode ser regenerada por injeção de uma solução do dodecil-sulfato de sódio 1% (p/v). A determinação da TnT foi realizada em amostras de soros humanos permitindo seu uso nas aplicações clínicas para diagnóstico do IAM
Landim, Vicente de Paulo dos Anjos. "Desenvolvimento de imunossensor eletroquímico empregando nanohíbrido Pirrol – nanotubos de haloisita para detecção da troponina T cardíaca humana." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/10949.
Full textMade available in DSpace on 2015-03-05T19:28:07Z (GMT). No. of bitstreams: 2 DISSERTAÇÃO Vicente de Paulo dos Anjos.pdf: 1268595 bytes, checksum: 1d1caae923b11bb4068e6694be7813fd (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2014
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Diversos imunoensaios vem sendo empregados na rotina laboratorial para dosagem das troponinas cardíacas, devido a sua alta sensibilidade e especificidade no diagnóstico do infarto agudo do miocárdio. Entretanto, estes métodos apresentam significativas limitações para diagnóstico à beira do leito de pacientes infartados de modo prático, rápido e seguro. Dessa forma, os imunossensores eletroquímicos surgem como uma importante ferramenta analítica. O objetivo deste trabalho foi desenvolver um imunossensor eletroquímico baseado em um filme nanoestruturado de pirrol-2-carboxílico e nanotubos de haloisita para detecção de níveis clínicos da troponina T cardíaca humana. O eletrodo de carbono vítreo foi submetido à eletropolimerização do pirrol-2-carboxílico (0,01 M). Os grupos carboxílicos derivados do filme de pirrol na superfície sensora foram ativados e em seguida incubados com uma solução de nanotubos de haloisita funcionalizados com grupos amina (5 mg/mL). Para imobilização dos anticorpos anti-troponina T, o eletrodo de carbono foi previamente incubado com uma solução de glutaraldeído (5%). Os sítios ativos remanescentes do eletrodo foram bloqueados com uma solução de glicina. A caracterização do imunossensor foi realizada usando as técnicas de voltametria cíclica e de pulso diferencial. A eletrossíntese do pirrol-2-carboxílico foi otimizada utilizando o perclorato de lítio como contra-íon na eletrossíntese do polímero, sob a velocidade de polimerização de 20 mV/s. O filme nanoestruturado de pirrol-2-carboxílico (0,01 M) e nanotubos de haloisita (5 mg/mL) apresentou uma estabilidade cinco vezes maior quando comparado ao estudo controle (sem pirrol-2-carboxílico). Ensaios para padronização da concentração do anticorpo anti-troponina T imobilizado e tempo de interação antígeno-anticorpo foram realizados e otimizados na concentração de 5 μg/mL e 60 min, respectivamente. Uma curva de calibração foi obtida para as diferentes concentrações de cTnT utilizando a técnica de voltametria de onda quadrada. O imunossensor proposto apresentou uma boa linearidade com r=0,996 (p << 0,001; n = 6) e limite de detecção de 0,008 ng/mL. O filme nanohíbrido de pirrol-2-carboxílico e nanotubos de haloisita para detecção eletroquímica da troponina T demonstrou propriedades desejáveis, tais como estabilidade, reprodutibilidade e sensibilidade.
Alquézar, Arbé Aitor. "Troponina T d'elevada sensibilitat per a l'exclusió precoç de l'infart agut de miocardi sense elevació del segment st." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/284855.
Full textBackground: Chest pain suggestive of myocardial ischemia is a very common chief complaint in the Emergency Department. However, myocardial ischemia is ruled out in the majority of these cases. It is necessary to optimize the diagnostic management of chest pain. A rise and/or fall (Δ value) in levels in cTn is obligatory criteria for the diagnosis of NSTEMI. The development and introduction of new immunoassay (hs-cTnT) have changed the diagnostic approach of NSTEMI. This immunoassay not only facilitates early diagnosis of NSTEMI, but it also allows the diagnosis of small size NSTEMI. This immunoassay is highly specific tool for diagnosing myocardial injury; however, they do not identify the cause of myocardial injury. As a consequence, hs-cTnT can be elevated in many situations different of a thrombotic occlusion of a coronary artery. It is recommended the implementation of algorithms based on hs-cTnT for the early diagnosis of NSTEMI, although there are unresolved questions about its use: Implementation of rapid diagnostic algorithms for NSTEMI. Best moment for sample collection. Optimal Δ value (absolute or relative) for NSTEMI diagnosis. Objectives: To validate an algorithm for early exclusion of acute myocardial infarction diagnosis. To evaluate the best moment to sample collection and to determine the optimal kinetic change for the diagnosis of NSTEMI. Methods: Prospective cohort enrolled in an emergency department of a university hospital. Sample collection were obtained at study inclusion, and at 1 hour, 2 hours and >4 hours Results: Determination 0->4hours has a better diagnostic performance than 0-1h or 0-2h (p>0.05). In this interval, there is no difference between relative and absolute Δ values (p=0.36). The use of an algorithm 0->4h with absolute or relative Δ values allows to exclude NSTEMI (Sensitivity 100%). The use of an algorithm 0-1h generates a group of patients who require additional criteria to confirm or exclude NSTEMI. Conclusions: Using an algorithm with 0->4h with absolute or relative Δ value allows to exclude NSTEMI. In selected cases, it is possible to confirm or exclude the diagnosis with a single sample. In some situations, it can be useful an algorithm with 0-1h with absolute Δ value. These algorithms cannot be used to discharge patients without NSTEMI. Some of these cases are unstable anginas and require additional tests for diagnosis.
Books on the topic "Troponina T"
Austin, Emily Jane. Characterisation of the interaction sites between Troponin T and Troponin C of the Troponin complex from human cardiac muscle. Birmingham: University of Birmingham, 1999.
Find full textSwanwick, Richard Stephen. Mapping the interactions of the C-terminus of rabbit skeletal troponin T with troponin C and tropomyosin. Birmingham: University of Birmingham, 2003.
Find full textRazzaq, Tahir M. Structural functional studies on troponin T probed by protein engineering. Birmingham: University of Birmingham, 1996.
Find full textSabry, Mohamed Abdalla. Development transitions of the contractile regulatory proteins, troponin I and troponin T, in striated muscles: An immunochemical study. Birmingham: University of Birmingham, 1992.
Find full textLennox, Richard J. An evaluation of serum troponin-T as a prognostic indicator in unstable angina. [S.l: The Author], 1994.
Find full textShirodaria, Cheerag, and Sam Dawkins. Acute coronary syndromes. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0090.
Full textErlinge, David, and Göran Olivecrona. Diagnosis and management of non-STEMI coronary syndromes. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0146.
Full textBook chapters on the topic "Troponina T"
van Balen, J. A. M., A. A. Demeulemeester, M. Frölich, K. Mohrmann, L. M. Harms, W. C. H. van Helden, L. J. Mostert, and J. H. M. Souverijn. "Troponine T." In Memoboek, 197. Houten: Bohn Stafleu van Loghum, 2012. http://dx.doi.org/10.1007/978-90-313-9129-5_121.
Full textLackner, K. J., and D. Peetz. "Troponin T, kardiales." In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-49054-9_3126-1.
Full textAbbasi, Adeel, Francis DeRoos, José Artur Paiva, J. M. Pereira, Brian G. Harbrecht, Donald P. Levine, Patricia D. Brown, et al. "Cardiac Troponin T." In Encyclopedia of Intensive Care Medicine, 490. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_1306.
Full textLackner, K. J., and D. Peetz. "Troponin T, kardiales." In Springer Reference Medizin, 2368. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_3126.
Full textMahmud, Zabed, and Peter M. Hwang. "Cardiac Troponin Complex: Cardiac Troponin C (TNNC1), Cardiac Troponin I (TNNI3), and Cardiac Troponin T (TNNT2)." In Encyclopedia of Signaling Molecules, 692–701. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_101901.
Full textMahmud, Zabed, and Peter M. Hwang. "Cardiac Troponin Complex: Cardiac Troponin C (TNNC1), Cardiac Troponin I (TNNI3), and Cardiac Troponin T (TNNT2)." In Encyclopedia of Signaling Molecules, 1–10. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4614-6438-9_101901-1.
Full textFrey, Norbert, Margit Müller-Bardorff, and Hugo A. Katus. "Myocardial Damage: The role of Troponin T." In Developments in Cardiovascular Medicine, 27–39. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2380-0_3.
Full textDean, Kenneth J. "Biochemistry and Molecular Biology of Troponins I and T." In Cardiac Markers, 193–204. Totowa, NJ: Humana Press, 1998. http://dx.doi.org/10.1007/978-1-4612-1806-7_12.
Full textDean, Kenneth J. "Cardiac Troponin T as a Marker of Myocardial Injury." In Cardiac Markers, 205–27. Totowa, NJ: Humana Press, 1998. http://dx.doi.org/10.1007/978-1-4612-1806-7_13.
Full textOhtsuki, Iwao. "Calcium ion regulation of muscle contraction: The regulatory role of troponin T." In Muscle Physiology and Biochemistry, 33–38. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-5543-8_3.
Full textConference papers on the topic "Troponina T"
Gunda, Naga Siva Kumar, and Sushanta K. Mitra. "Microfluidic Based Biosensor for Detection of Cardiac Markers." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16270.
Full textMelentiev, Pavel, Lina Son, Denis Kudryavtsev, Anton Afanasiev, Igor Kasheverov, Victor Tsetlin, and Victor Balykin. "Ultra-Fast Single Troponine-T Molecule Sensing." In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8872744.
Full textHøiseth, Arne Didrik, Anke Neukamm, Pål H. Brekke, Torbjørn Omland, and Vidar Søyseth. "Prognostic Value Of Troponin T In COPD Exacerbation." In American Thoracic Society 2010 International Conference, May 14-19, 2010 • New Orleans. American Thoracic Society, 2010. http://dx.doi.org/10.1164/ajrccm-conference.2010.181.1_meetingabstracts.a5917.
Full textSchiopu, Paul, Alexandru Craciun, Neculai Grosu, Carmen-Marinela Mihailescu, Marian Vladescu, Valentin Feies, Mihaela Savin, and Dana Stan. "Rapid test immunocromatografic with detection in fluorescence of cardiac troponin T." In Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies IX, edited by Ionica Cristea, Marian Vladescu, and Razvan D. Tamas. SPIE, 2018. http://dx.doi.org/10.1117/12.2501350.
Full textVestjens, Stefan, Simone Spoorenberg, Ger Rijkers, Jan Grutters, Jurriën Ten Berg, Ewoudt van de Garde, and Willem Jan Bos. "Cardiac troponin T in predicting mortality after hospitalisation for community-acquired pneumonia." In ERS International Congress 2016 abstracts. European Respiratory Society, 2016. http://dx.doi.org/10.1183/13993003.congress-2016.oa3325.
Full textProcopio, Anna, Salvatore De Rosa, Caterina Covello, Alessio Merola, Jolanda Sabatino, Alessia De Luca, Ciro Indolfi, Francesco Amato, and Carlo Cosentino. "A model of cardiac troponin T release in patient with acute myocardial infarction." In 2017 IEEE 56th Annual Conference on Decision and Control (CDC). IEEE, 2017. http://dx.doi.org/10.1109/cdc.2017.8263703.
Full textJende, J., S. Kopf, Z. Kender, A. Hahn, J. Morgenstern, P. Nawroth, M. Bendszus, and F. Kurz. "Troponin T als Indikator für die Schädigung peripherer Nerven bei Diabetes Typ 2." In 101. Deutscher Röntgenkongress und 9. Gemeinsamer Kongress der DRG und ÖRG. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1703301.
Full textRadha Shanmugam, Nandhinee, Sriram Muthukumar, and Shalini Prasad. "Zinc Oxide Nanostructures as Electrochemical Biosensors on Flexible Substrates." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9085.
Full textYeom, Se-Hyuk, Byoung-Ho Kang, Kyu-Jin Kim, Heng Yuan, Ok-Geun Kim, Ma-Eum Han, Dae-Hyuk Kwon, and Shin-Won Kang. "Nanoporous aluminum anodic oxide-based optical biosensor for real-time detection of Troponin T." In 2011 IEEE Sensors. IEEE, 2011. http://dx.doi.org/10.1109/icsens.2011.6127091.
Full textFurer, V., S. Shenhar-Tsarfaty, S. Berliner, U. Arad, D. Paran, O. Rogowski, I. Shapira, H. Matz, and O. Elkayam. "FRI0679 High sensitivity cardiac troponin t in psoriatic arthritis patients: a cross-sectional controlled study." In Annual European Congress of Rheumatology, EULAR 2018, Amsterdam, 13–16 June 2018. BMJ Publishing Group Ltd and European League Against Rheumatism, 2018. http://dx.doi.org/10.1136/annrheumdis-2018-eular.4002.
Full textReports on the topic "Troponina T"
Viksna, Ludmila, Oksana Kolesova, Aleksandrs Kolesovs, Ieva Vanaga, and Seda Arutjunana. Clinical characteristics of COVID-19 patients (Latvia, Spring 2020). Rīga Stradiņš University, December 2020. http://dx.doi.org/10.25143/fk2/hnmlhh.
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