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[Ventricular arrhythmia and sudden cardiac death: the significance of left ventricular hypertrophy as risk factor].

Left ventricular hypertrophy is a frequent and early manifestation of cardiac structural adaptation in patients with essential hypertension. Prospective studies have clearly demonstrated that left ventricular hypertrophy represents a risk factor for cardiovascular morbidity and mortality, including sudden cardiac death. The increased risk is independent of the impact of high blood pressure and other risk factors on the cardiovascular system. Various clinical studies noted increased prevalence and severity of premature ventricular beats in hypertensive patients with left ventricular hypertrophy. Hypertrophy of myocardial cells, dilation of the left ventricle, increased stress of subendocardial myocardium and impaired coronary reserve are discussed as a possible pathogenetic link between myocardial hypertrophy and ventricular arrhythmias. Therapeutically, the primary goal for ventricular arrhythmias in hypertensive patients with left ventricular hypertrophy is regression of left ventricular mass. For this purpose, centrally sympatholytic agents, angiotensin converting enzyme inhibitors, betablockers and calcium antagonists have been found to be effective. Recently we observed that a reduction of left ventricular hypertrophy was associated with a decreased prevalence and severity of ventricular arrhythmias. Nevertheless, prospective studies are required to demonstrate whether reduction of severe ventricular arrhythmias helps to prevent sudden cardiac death due to left ventricular hypertrophy in hypertension.

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