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Increased renovascular response to angiotensin II in persons genetically predisposed to arterial hypertension disappears after chronic angiotensin-converting enzyme inhibition

Objective and methods Functional changes in the kidneys of healthy men with (FH+) (n = 15) and without (FH−) (n = 15) family history of primary arterial hypertension were examined during administration of low-dose exogenous angiotensin II (A2) (1 ng/kg per min) before and after acute (1 mg intravenous enalaprilat) and chronic (7 days oral enalapril, 30 mg/day) angiotensin-converting enzyme (ACE) inhibition. Results Before chronic ACE inhibition, A2 increased mean arterial blood pressure (FH+, 8.7 ± 0.8 mmHg; FH−, 8.9 ± 0.9 mmHg), plasma immunoreactive A2 (FH+, 21 ± 2 pg/ml; FH−, 18 ± 3 pg/ml) and plasma aldosterone (FH+, 64 ± 7 pg/ml; FH−, 56 ± 6 pg/ml) to a similar degree in both groups. Chronic ACE inhibition had no impact on A2 blood pressure, plasma A2, or plasma aldosterone effects. A2 significantly increased renal vascular resistance in both groups (FH+, 3956 ± 462 dyne s cm–5; FH−, 2219 ± 550 dyne s cm–5), but the effect was more pronounced in FH+ (P = 0.02). Glomerular hemodynamics, estimated by a modified Gomez model, revealed increased afferent and efferent responsiveness to A2 in FH+ subjects. These differences disappeared after chronic ACE inhibition when total, afferent and efferent sensitivities to A2 were similar in both groups. Conclusions Systemic blood pressure and plasma aldosterone responses to A2 were similar in men with or without a genetic disposition to primary arterial hypertension. However, our data demonstrate that men with a family history of hypertension have increased renovascular sensitivity to A2, and that chronic ACE inhibition normalizes their sensitivity.