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Amiodarone, administered orally in doses of 200 to 600 mg/day, was remarkably effective in the treatment and prevention of a wide variety of atrial and ventricular arrhythmias. Total suppression and control was provided in 98 (92.4 percent) of 106 patients with supraventricular arrhythmias and in 119 (82 percent) of 145 patients with ventricular(More)
BACKGROUND The relationship between anti-beta-adrenergic (anti-betaR) and anti-M(2)-cholinergic (anti-M2R) receptor antibodies (Abs) and cardiac arrhythmias and their biochemical effects have not been systematically investigated. METHODS AND RESULTS We studied 41 patients, 28 with ventricular arrhythmias (primary or due to Chagas' heart disease or(More)
BACKGROUND The mechanisms underlying inappropriate sinus tachycardia are not fully known. An autonomic imbalance seems to play a role, but no attempts have been made to investigate a relationship between this arrhythmia and the antiautonomic membrane receptor antibodies found in other heart disorders and arrhythmias. OBJECTIVE The purpose of this study(More)
Sera from chagasic patients possess antibodies recognizing the carboxy-terminal part of the ribosomal P0 protein of Trypanosoma cruzi and the second extracellular loop of the human beta 1-adrenergic receptor. Comparison of both peptides showed that they contain a pentapeptide with very high homology (AESEE in P0 and AESDE in the human beta 1-adrenergic(More)
IgG fractions of patients were screened for autoantibodies against the beta1- and beta2-adrenoceptors and the M2 acetylcholine receptor by enzyme immunoassays and surface plasmon resonance (SPR) using peptides corresponding to the second extracellular loop of these receptors. A high prevalence of anti-M2 acetylcholine receptor and, in decreasing order, of(More)
A 22-year-old female, asymptomatic and without any evidence of cardiac disease, was found to have a persistent idioventricular tachycardia (IVT). Sinus rhythm and IVT rates were similar and showed parallel changes in successive resting electrocardiograms. Both IVT and sinus rhythm were transiently slowed or suppressed by vagal stimulation and accelerated by(More)
Conversion from Chagas' infection to chagasic myocarditis occurs slowly and the earliest signs of myocardial involvement are hard to define. To obtain new information on this difficult clinical problem, ajmaline was administered (1 mg/kg body weight intravenously) to 101 patients with Chagas' infection and to 46 patients without such infection (control(More)
BACKGROUND Trypanosoma cruzi ribosomal P proteins, P2β and P0, induce high levels of antibodies in patients with chronic Chagas' disease Cardiomyopathy (CCC). It is well known that these antibodies alter the beating rate of cardiomyocytes and provoke apoptosis by their interaction with β1-adrenergic and M2-muscarinic cardiac receptors. Based on these(More)
Arrhythmias may be controlled in most patients with recurrent supraventricular tachycardia or atrial fibrillation with small to moderate maintenance doses of amiodarone (100 to 400 mg/day). Moderate doses (400 mg/day) are also highly effective in suppressing "warning" ventricular arrhythmias in patients with chronic ischemic heart disease, particularly if(More)