Luiz Roberto Leite

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BACKGROUND Renal artery stenosis (RAS) is a potentially correctable cause of hypertension and ischemic nephropathy. Despite successful renal revascularization, not all patients (pt) overcome it and some get worse. OBJECTIVE This study was designed to assess the value of renal resistance index (RI) in predicting the outcome of renal revascularization. (More)
OBJECTIVES We sought to evaluate the efficacy and safety of a novel cryothermal balloon ablation system in creating pulmonary vein (PV) isolation. BACKGROUND Pulmonary vein isolation using standard radiofrequency ablation techniques is limited by procedure-related complications, such as thrombus formation and PV stenosis. Cryothermal ablation may reduce(More)
BACKGROUND Pulmonary vein isolation (PVI) with balloon catheter has been used as the endpoint for AF ablation. OBJECTIVE To determine the usefulness of intracardiac ultrasound (ICUS) to guide PVI using laser balloon catheter. METHODS 59 PVs were ablated in 27 dogs. Doppler imaging was used to identify blood flow leaks between PV and balloon. After each(More)
BACKGROUND AND AIMS Slow conduction scarred areas are related with ventricular tachycardia (VT) arrhythmogenesis in nonischemic cardiomyopathy. The purpose of this study was to characterize the substrate in both epicardial and endocardial surfaces of the left ventricle and to evaluate the effectiveness of substrate mapping and ablation for VT in Chagas(More)
INTRODUCTION This study assessed the role of electrophysiologic testing to identify therapeutic strategies for the treatment of patients with sustained ventricular tachycardia (VT) and chronic chagasic cardiomyopathy treated with amiodarone or sotalol. METHODS AND RESULTS One hundred fifteen patients [69 men (60%); mean age 52 +/- 10 years] with chagasic(More)
BACKGROUND Luminal esophageal temperature (LET) monitoring is one strategy to minimize esophageal injury during atrial fibrillation ablation procedures. However, esophageal ulceration and fistulas have been reported despite adequate LET monitoring. The objective of this study was to assess a novel approach to LET monitoring with a deflectable LET probe on(More)
OBJECTIVE Although oral anticoagulation has proved beneficial for patients with atrial fibrillation (AF) and embolic risk factors, it is still underused. The objective of this study was to evaluate the adequacy of anticoagulation therapy in patients with AF followed in a private clinic specialized in cardiology, in accordance with the American and European(More)
The head-up tilt test (HUTT) is widely used for investigation of syncope and presyncope, since it allows diagnosing different types of dysautonomia. The main cause of syncope is the vasovagal syndrome, the most common diagnosis among patients with HUTT indication. The test has been used for nearly 20 years, but many doctors are unaware of the methodology.(More)
Coronary artery injury is a rare complication of radiofrequency catheter ablation. We describe the case of a 12-year-old girl who had an acute distal right coronary artery (RCA) occlusion during radiofrequency catheter ablation of a postero-septal accessory pathway treated with mechanical reperfusion utilizing an angioplasty guidewire. Coronary angiography(More)
Pheochromocytoma is a catecholamine-secreting tumor of the adrenal glands, usually with benign manifestations, whose typical clinical presentation includes the triad of headache, palpitations and diaphoresis. However, a wide range of signs and symptoms may be present. In the cardiovascular system, the most common signs are labile hypertension and sinus(More)