Correlação entre parâmetros ecocardiográficos e sobrevida na insuficiência cardíaca de etiologia chagásica

• Autor(a) principal: FROTA, Daniela do Carmo Rassi
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/1749
• topic: Doenças de Chagas; ecocardiograma; disfunção ventricular importante; CNPQ::CIENCIAS DA SAUDE::MEDICINA::CLINICA MEDICA::CARDIOLOGIA

Introduction: Chagas disease is still considered a serious health and economics problem even one hundred years after its discovery in Latin American countries. In chronic phase the cardiac involvement is the most frequent and severe manifestation. The two-dimensional echocardiography provides important data for diagnosis and prognosis of this disease, mainly by evaluating the degree of ventricular impairment. Objectives: To correlate echocardiographic parameters with cardiovascular mortality (primary end-point) in a population of chagasic patients with severe ventricular dysfunction (ejection fraction <35%). Also establish the correlation between E / Em ratio, end-diastolic pressure of left ventricle (LVEDP) and plasma level of BNP in order to estimate filling pressures. Methods: This study is a retrospective analysis of a cohort of 60 patients included in Randomized Multicenter Study of Cardiac Cell Therapy in Chagas' heart disease - from February 2006 to February 2009. Echocardiographic parameters analyzed were left ventricle end diastolic and end systolic diameter (LVDD and LVSD), left ventricle diastolic and systolic volume (LVDV and LVSV), ejection fraction estimated by Simpson's method (EF), diameter of left atrium (LA), left atrial volume and left atrial volume indexed (LAV and LAV / m²), pulmonary artery systolic pressure (PASP), integral velocity of aortic flow (IVT Ao), index of myocardial performance (IMP), increase rate of left ventricular pressure (dP / dT), isovolumic relaxation time (IVRT), velocity of E , A, Em, Am and Sm waves, deceleration time of E wave (TDA), E / A ratio, E / Em ratio and mitral regurgitation (MR). Statistical analysis as performed by univariate and multivariate Cox regression model and survival curves were calculated by the KM method and compared using the log-rank test (significant p <0.05). Results: Over a mean follow up period of 24.18 months, 27 patients died. The echocardiographic parameters that correlated with primary end-point with statistical significance in univariate analysis were: EF (HR 0.932), LVDV (HR 1.005), LVSV (HR 1.005), LA (HR 1.064), LAV / m² (HR 1.036), PASP (HR 1.039 ), TDA (HR 0.993), IMP (HR 2.423), velocity of A wave (HR 0.976), velocity of E wave (HR 1.029), E / A ratio (HR 1.589), E / Em wave (HR 1.083), MR 1vs 2 (HR 0.325). For multivariate analysis were selected the variables EF, LAV/m², and E/Em, based on their clinical relevance. The results were: EF (HR 0.95 p <0.1261), LAV/m2 (HR 1.033 p <.0001) and E / Em ratio (HR 1.034 p <0.3704). ROC curve identified the best cutoff value to predict the final outcome and a LAV> 70.71 ml / m² was associated with a significant increase in mortality (log rank p <0.0001). No correlation was demonstrated between the E/Em, LVEDP and BNP Conclusions: Echocardiography has proved to be a useful test in the ability to predict mortality outcome even in a population of patients with severe prognosis. Among the variables studied left atrial volume indexed to body surface area was a significant and independent predictor of mortality in patients with heart failure due to Chagas´cardiomyophaty.