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  • Title: [Effects of converting enzyme inhibition by enalapril on renal hemodynamics in essential arterial hypertension].
    Author: Chaignon M, Moreau L.
    Journal: Presse Med; 1988 Oct 08; 17(34):1745-7. PubMed ID: 2855543.
    Abstract:
    The effects of enalapril, an angiotensin-converting enzyme inhibitor, on renal haemodynamics were studied in 10 patients with moderates essential hypertension and no renal failure. Renal blood flow and glomerular filtration were measured (by I 131-hippuran and I 125-iothalamate clearances respectively), before ("placebo period"), and after 15 days of treatment with enalapril 40 mg/day. The drug clearly had an antihypertensive effect: systolic pressure fell from 169 +/- 4 to 149 +/- 5 mmHg (P less than 0.01), and diastolic pressure from 111 +/- 3 to 94 +/- 3 mmHg (P less than 0.01). Enalapril induced marked renal vasodilatation: renal vascular resistance decreased from 0.18 +/- 0.01 to 0.14 +/- 0.01 A.U. (P less than 0.01); renal blood flow was moderately increased (from 764 +/- 43 to 829 +/- 43 ml/min/1.73 m2, P less than 0.05), while glomerular filtration rate remained unmodified (118 +/- 4 versus 120 +/- 6 ml/min/1.73 m2, NS). Under enalapril, the filtration fraction decreased from 0.29 +/- 0.01 to 0.26 +/- 0.01 (P less than 0.01). These results confirmed that enalapril produces dilatation of both the afferent and efferent arterioles - a mechanism that might lower perfusion pressure in the glomerular capillary vessels.
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