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  • 1
    ISSN: 1432-1440
    Keywords: Angiotensin-converting-enzyme-inhibition ; Kallikrein-blockade ; Kinins ; Essential hypertension ; Angiotensin-Converting-Enzym-Hemmung ; Kallikrein-Blockade ; Kinine ; Essentielle Hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei essentiellen Hypertonikern mit niedriger und normaler Plasmareninaktivität, nicht dagegen bei Patienten mit hohen Reninwerten, konnte der akute antihypertensive Effekt einer Angiotensin-Converting-Enzym-(ACE) Blockade mit Captopril durch eine Aprotinin-induzierte Kallikreinblockade vollständig verhindert werden. Nach chronischer ACE-Hemmung ließ sich die Blutdrucksenkung nur zum Teil durch Aprotinin aufheben. Die Ergebnisse weisen darauf hin, daß bei essentieller Hypertension mit normaler und niedriger Reninaktivität der blutdrucksenkende Effekt einer akuten ACE-Hemmung im wesentlichen Folge einer Kinin-Akkumulation ist. Dagegen scheint bei Patienten mit hoher Reninaktivität eine Abnahme der Angiotensin II-Konzentration für die antihypertensive Wirkung von Captopril verantwortlich zu sein. Der pressorische Effekt von Aprotinin bei Patienten unter Langzeittherapie mit Captopril weist darauf hin, daß Kinine auch für die unter chronischer ACE-Hemmung auftretende Blutdrucksenkung mitverantwortlich sind. Die Beobachtung, daß ACE-Inhibition und Kallikrein-Blockade voraussagbare und gegensinnige Effekte auf den Blutdruck hervorrufen, läßt eine Beteiligung des Kallikrein-Kinin-Systems an der Kontrolle des Gefäßtonus bei essentieller Hypertension vermuten.
    Notes: Summary In low- and normal- renin hypertensive patients, but not in high-renin patients, the acute antihypertensive response to the angiotensin-converting enzyme (ACE) inhibitor captopril was completely blocked by aprotinin-induced kallikrein inhibition. Blood pressure reduction with long-term ACE inhibition could be overcome only in part by aprotinin. It is proposed that in low- and normal-renin hypertension the vasodepressor effect of acute ACE inhibition is mainly due to kinin accumulation. Conversely, in high-renin patients a fall in angiotensin II concentration accounts for the hypotensive response to captopril. From the pressor effect of aprotinin in chronically captopril treated patients it appears that kinins are also involved in the blood pressure reduction with long-term ACE inhibition. The finding that ACE inhibition and kallikrein blockade produced predictable and opposite effects on blood pressure suggests broad participation of changes in depressor kinin production in the control of vascular tone in essential hypertension.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 61 (1983), S. 377-378 
    ISSN: 1432-1440
    Keywords: Angiotensin converting enzyme ; Essential hypertension ; Plasma renin activity ; Angiotensin II ; Captopril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Serum ACE-activity was studied in 27 young patients with uncomplicated essential hypertension. The possible importance of an increase in ACE for the pathogenesis of essential hypertension was evaluated by comparing the ACE levels to PRA, the plasma concentrations of angiotensin II and to the blood pressure lowering effect of captopril. Mean ACE-activity was slightly but significantly elevated in the hypertensive patients when compared to 28 normotensive control subjects. ACE-activity was not correlated to PRA, angiotensin II or the decrease in blood pressure following captopril. It is concluded that the increase in ACE-activity in essential hypertension is not of pathophysiological or clinical significance.
    Type of Medium: Electronic Resource
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