[Factors influencing left ventricular function in arterial hypertension].

Using digitized M-mode echograms we evaluated the role of preload, afterload, inotropic state and left ventricular (LV) mass on LV systolic and diastolic function in 2 groups of hypertensive patients: Group 1: 25 subjects (18 men, mean age 48 +/- 6 years) with normal LV mass (less than 230 g); Group 2: 25 subjects (20 men, mean age 50 +/- 8 years) with LV hypertrophy (wall hypertrophy with normal LV diameter). As control group, we evaluated 50 normal subjects, matched for age, sex and body surface area with hypertensives. LV mass was significantly (p less than 0.001) higher as respect to normals also in hypertensives with normal LV mass; indexes of LV systolic and diastolic function were similar in normals and in hypertensives with normal LV mass and significantly lower in subjects with LV hypertrophy. The end-systolic wall stress was not significantly different in the 2 groups of hypertensives. We evaluated the relative role of preload (end-diastolic LV diameter), afterload (end-systolic wall stress) inotropic state (systolic arterial pressure/end-systolic LV diameter) and LV mass on LV systolic and diastolic function using multiple regression analysis. As regards LV systolic function, the major determinant was the systolic pressure/end-systolic diameter ratio in normals, the end-systolic stress in hypertensives. As regards LV diastolic function, the major determinant was end-systolic stress in normals and hypertensives with normal LV mass, LV mass in hypertensives with myocardial hypertrophy. Preload seems not to influence LV function in normals and in hypertensives with normal LV diastolic diameter. The major determinant of LV systolic function is the inotropic state in normals and the afterload in hypertensives.(ABSTRACT TRUNCATED AT 250 WORDS)