Cardiac and hormonal effects of enalapril in hypertension

Shigefumi Morioka, Geza Simon, Jay N. Cohn

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Systolic time measurements, echocardiography, and bicycle exercise testing with cardiac output determinations (CO2 rebreathing) were used to evaluate cardiac performance in 16 male hypertensives at the end of a 4-wk placebo period and after 12 wk of treatment with increasing doses (maximum = 40 mg/day) of enalapril maleate (N = 11) and of placebo (N = 5). The effect of exercise on plasma renin activity (PRA) and plasma norepinephrine (NE) concentration was also measured. Mean arterial pressure was reduced by 10 mm Hg or more in all but one subject who received enalapril. In both the enalapril- and placebo-treated subjects, the preejection period/left ventricular ejection time ratio and fractional shortening of the left ventricle at rest and cardiac output and stroke volume during moderate exercise did not change during the study. Enalapril induced a compensatory rise in PRA (N = 10). Compared to plasma NE concentration, 1124 ± 380 pg/ml (mean ± SD), during exercise at the end of the initial placebo period, there was attenuation of the rise of plasma NE concentration, 851 ± 290, at the same load of exercise during enalapril therapy. Unchanged cardiac performance despite effective long-term lowering of blood pressure with enalapril may relate to inhibition of angiotensin 11-mediated facilitation of NE release from peripheral nerve endings.

Original languageEnglish (US)
Pages (from-to)583-589
Number of pages7
JournalClinical pharmacology and therapeutics
Volume34
Issue number5
DOIs
StatePublished - Nov 1983

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Enalapril
Hypertension
Norepinephrine
Placebos
Renin
Cardiac Output
Cardiac Volume
Nerve Endings
Angiotensins
Peripheral Nerves
Stroke Volume
Heart Ventricles
Echocardiography
Arterial Pressure
Blood Pressure
Therapeutics

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Cardiac and hormonal effects of enalapril in hypertension. / Morioka, Shigefumi; Simon, Geza; Cohn, Jay N.

In: Clinical pharmacology and therapeutics, Vol. 34, No. 5, 11.1983, p. 583-589.

Research output: Contribution to journalArticle

Morioka, Shigefumi ; Simon, Geza ; Cohn, Jay N. / Cardiac and hormonal effects of enalapril in hypertension. In: Clinical pharmacology and therapeutics. 1983 ; Vol. 34, No. 5. pp. 583-589.
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