Abstract
The aim of this study was to investigate whether caffeine stimulates selectively renal vein renin levels at the side of unilateral stenosis in patients with renovascular hypertension. In this study seven of the involved patients had renal arterial stenosis and four had no stenosis. Four of the seven patients with a stenosis had retrospectively-proven renovascular hypertension. Renal vein renin sampling was performed before and after intravenous administration of caffeine. Caffeine did not induce any consistent effect on plasma renin activity in the renal veins, either on the stenotic side or on the contralateral side in patients with renovascular hypertension. There were no consistent caffeine mediated changes in systemic plasma renin activity.
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