Effects of reduced preload on diastolic filling in essential hypertensive patients with increased left ventricular mass

Abstract

Doppler-derived indices of diastolic filling are widely used in the routine evaluation of essential hypertensives. However, these indices are affected by loading conditions and systolic performance. This study aimed at monitoring the transmitral flow pattern and indices of left ventricular systolic function during acute nonpharmacological isolated reduction of preload in essential hypertensives with left ventricular hypertrophy. Nine essential hypertensive patients with left ventricular hypertrophy and nine age- and sex-matched normotensive controls underwent echocardiographic and Doppler evaluation of both systolic function and diastolic filling indices at baseline and during lower body suction at −40 mm Hg. Lower body suction caused a similar decrease in end-diastolic volume index, stroke volume index, and midwall fractional shortening in the normotensives and hypertensives. Circumferential end-systolic stress was unaffected in both groups. Acceleration time of early diastolic filling and isovolumic relaxation time increased in the normotensives but not in the hypertensives. Deceleration time of early diastolic filling increased in both groups. The ratio of peak velocities during early filling and at atrial contraction decreased in the normotensives, whereas it was unchanged in the hypertensives; this was due to the fact that early filling velocity decreased in both groups, whereas peak velocity at atrial contraction decreased only in the hypertensives. We conclude that Doppler-derived diastolic filling indices are not affected by a reduction of preload in essential hypertensives with left ventricular hypertrophy.