to study left ventricular diastolic function in chagas 's disease , simultaneous echocardiograms , phonocardiograms , and apexcardiograms were recorded in 20 asymptomatic patients with positive chagas 's serology and no signs of heart disease ( group 1 ) , 12 with chagas 's heart disease and symptoms of ventricular arrhythmia but no heart failure ( group 2 ) , 20 normal subjects ( group 3 ) , and 12 patients with left ventricular hypertrophy ( group 4 ) .
C0018787
heart
C0018801
heart failure