Hypertension Clinical Trial
Official title:
Effects of Nebivolol on Left Ventricular and Left Atrial Morphodynamics in Adults With Hypertension and Isolated Diastolic Dysfunction
To investigate whether treatment with Nebivolol in subjects with high blood pressure and abnormal filling of left ventricle (LVDD) improves exercise time by improving Left Ventricular deformation and filling.
Background:
The left ventricle (LV) ejects blood with a wringing motion, where the LV apex rotates
counterclockwise and the base rotates in clockwise directions respectively. Rapid untwisting
and recoil of LV during isovolumic relaxation and early diastole releases energy stored in
ejection for LV suction and rapid early diastolic restoration. The LV geometry and its
rotational mechanics also give rise to intracavitary blood flow rotation resulting into LV
intracavitary vortex ring formation. LV torsion and vortex ring formation confer
morphodynamic advantages that gain importance as blood flow velocities, heart rate and rates
of change of momentum increase with exertion for improving LV efficiency. We have recently
characterized the significance of LV twist mechanics and vortex ring formation in human
hearts using novel high resolution speckle and contrast particle tracking echocardiography.
Although data on a favorable effect of nebivolol on exercise capacity and LV diastolic
filling exists, the changes in left ventricular (LV) rotational mechanics and blood flow
vortex ring formation that may explain the potential hemodynamic benefits seen with nebivolol
have not been previously characterized.
Aims:
In patients with hypertension and left ventricular diastolic dysfunction (LVDD) treatment
with nebivolol for 6 months improves exercise time by enhancing:
1. LV deformation, torsion and untwisting mechanics
2. LA-to-LV blood flow transport and characteristics of intra-cavitary vortex formation
3. LA reservoir and booster pump function and LA-LV interaction during the conduit phase
Hypotheses:
Treatment with nebivolol in subjects with hypertension and LVDD improves exercise time by
improving LV deformation and diastolic filling. As diastole shortens with the tachycardia
associated with exercise, the contribution of untwist becomes relatively more important to LV
suction and filling. Nebivolol improves LV diastolic filling primarily by enhancing LV
untwisting and the rheological efficiency of blood flow transport through vortex formation in
early diastole.
Significance:
Patients with LVDD are asymptomatic at rest and often but become markedly symptomatic with
exertion. This pilot study will provide data for the first time for correlating the
improvement in exercise capacity seen with the use of nebivolol with the changes in LV
relaxation, torsional mechanics, LV vortex formation and LA-LV transport functions. The
preliminary data will be essential for understanding the underlying pathophysiological
mechanisms through which nebivolol improves exercise hemodynamics besides providing data for
development of subsequent larger randomized multicentric trials.
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