[The role of hypertrophy and left ventricular function on the occurrence of ventricular arrhythmias in arterial hypertension]. / Papel da hipertrofia e da função ventricular esquerda sobre a ocorrência de arritmias ventriculares na hipertensão arterial.

ABSTRACT

PURPOSE: To evaluate the role of left ventricular hypertrophy (LVH), left ventricular systolic function an other clinical parameters on prevalence and complexity of ventricular arrhythmias in hypertension. METHODS: Ventricular arrhythmias were studied in 39 hypertensives by 24 hours ambulatory electrocardiographic monitoring. Frequency and complexity of ventricular arrhythmias were compared among 3 groups A and B, respectively without and with LVH, both with normal left ventricular function; and C with LVH and systolic dysfunction. LVH and systolic dysfunction were established echocardiographically. Linear regression analysis was performed in order to identify an independent correlation between clinical parameters and presence of arrhythmias. RESULTS: Group C patients were older and had significantly higher systolic and diastolic blood pressures, greater mass index, diastolic posterior wall thickness and end-systolic stress and increased prevalence of electrocardiographic strain. Left ventricular diastolic diameter in C group patients was increased only when compared to A group. Frequencies of cases with more than 10 ectopic ventricular beats/hour, pairs and nonsustained ventricular tachycardia episodes were all significantly increased in C when compared to B and to A. However, only left ventricular mass index or diastolic posterior wall thickness identified independently patients with ventricular arrhythmias. CONCLUSION: Left ventricular hypertrophy is the main predictor of potential high risk rhythm disturbances in hypertension.