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Acute effect of MK-421(enalapril) on blood pressure, the renin-angiotensin system and the kallikrein-kinin system in hypertensive patients Koichi Kondo 1 , Osamu Kida 1 , Kenji Kodama 1 , Toshinobu Higa 1 , Noriyuki Someya 1 , Yasuyuki Morotomi 1 , Kenjiro Tanaka 1 1The First Department of Internal Medicine, Miyazaki Medical College pp.811-815
Published Date 1985/6/15
DOI https://doi.org/10.11477/mf.1404204696

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  • Abstract
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Acute effects of a new converting enzyme inhib-itor, MK-421, on renin-angiotensin and kallikrein-kinin systems were examined in twelve hypertensive subjects.

They were included five patients with essential hypertension, four patients with renovascular hypertension and three hypertensives with renal parenchymal disease, and their mean age was 46.3 years. All antihypertensive drugs had been discon-tinued at least two weeks, and then 5mg of MK-421 given orally under normal sodium diet intake. Supine blood pressure and pulse rate were contin-uously monitored every 5 minutes before and 1, 2, 3, 4, 8. 12 and 24 hours after administration. Samples of blood were withdrawn before and 1, 4 and 24 hours after, and renin activity, aldcsterone concentration and bradykinin in plasma (PRA, PAC and BK) were measured by radioimmunoassay.

Blood pressure was maximally reduced from 154 ±6/98±3 mmHg to 124±7/81±4 mmHg (mean±SE, P<0.001) at 12 hours, and was significantly reduced even at 24 hours later. While, pulse rate remained unchanged in any time. PRA and BK were maximally increased from 3.5±0.7 ng/ml/h to 5.52±1.1 ng/ml/h (P<0.01) at 4 hours and from 27.0±8.2 pg/ml to 42.7±6.9 pg/ml (P<0.05) at 1 hour, respectively. And PAC was significantly decreased from 143.1±18.7 pg/ml to 106.0±13.2 pg/ml (P< 0.01) at 4 hours. The maximal fall in mean blood pressure was correlated with not only pretreatment level of PRA (r=-0.62, P<0.05) but also that of BK (r=-0.733, P<0.05).

It is concluded that MK-421 is a potent convert-ing enzyme inhibitor whose action lasts for over 24 hours. And its antihypertensive effect might appear to be closely linked to inhibition of BK degradation as well as angiotensin II synthesis.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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