Insulin Sensitivity Clinical Trial
Official title:
Assessment of Renin Inhibition on Insulin Sensitivity, Diastolic Function and Aortic Compliance
This study is an investigation of the effect of commonly prescribed anti-hypertensive agents
on insulin sensitivity, diastolic function and aortic compliance. The aims of the study are
as follows:
Specific Aim 1: To determine in insulin resistant, hypertensive subjects if renin inhibition
for 12 weeks modifies glucose homeostasis and insulin sensitivity.
To accomplish this specific aim, we will use three approaches: a fasting HOMA Index; and a
three hour glucose tolerance test. Only hypertensive subjects with insulin resistance, as
assessed by HOMA index will be enrolled in the study. Insulin resistance will be assessed
basally and after twelve weeks of treatment with either a calcium channel blocker with
placebo, or calcium channel blocker with a renin inhibitor, or a calcium channel blocker with
a renin inhibitor and an angiotensin receptor antagonist.
Specific Aim 2: To determine in insulin resistant, hypertensive subjects if renin inhibition
for 12 weeks modifies diastolic function and aortic compliance response to dietary sodium
intake.
The same protocol and subjects will be used as defined in Specific Aim 1. Myocardial
relaxation velocity (tissue Doppler imaging at the mitral annulus) and aortic compliance
(characteristic aortic impedance) will be measured at baseline and then after acute and
chronic renin inhibition:
1. Acute effect of renin inhibition: Hemodynamic measurements will be obtained on both high
and low dietary sodium intake conditions (~1 week each) before and after a single dose
of a renin inhibitor.
2. Chronic effect of renin inhibition: Hemodynamic measurements will be obtained at
baseline and after 12 weeks of each of the three drug treatment arms above.
The study lasts 12 weeks and plans to study 45 hypertensive adults over the next two years.
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