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Captopril in various forms of severe therapy-resistant hypertension

Captopril bei therapieresistenter Hypertonie

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Summary

In this study 51 patients with severe hypertension (20 essential, 15 renovascular and 16 renalparenchymatous) resistant to a standardized triple therapy were treated with the oral converting enzyme inhibitor captopril. Mean treatment period was 8.6 in essential, 8.9 in renovascular and 9.9 months in renalparenchymatous hypertension.

In each of the 3 groups a marked and sustained blood pressure reduction was observed promptly after introducing captopril. However, absolute fall in mean blood pressure as well as individual blood pressure response were more pronounced in renovascular than in essential and in renalparenchymatous hypertension demonstrating a higher blood pressure lowering activity of the converting enzyme inhibitor in the former.

In addition, our results document that monotherapy with captopril was rather the exception than the rule. More than 90% of all patients required at least the addition of a diuretic and even a substantial percentage of patients needed as a third drug a betablocker (50% in essential, 38% in renalparenchymatous and 26% in renovascular hypertension).

As expected renin activity increased under captopril whereas plasma aldosterone and converting enzyme activity decreased.

Side-effects (skin rash, pruritus, supraventricular extrasystoles, tachycardia, water and fluid retention, Raynaud-phenomenon, incomplete and complete taste loss and leucopenia) occurred in 17.6% (n=9) of the 51 patients.

Our results show that captopril is a potent blood pressure lowering agent in severe and therapy resistant hypertension. The vast majority of patients, however, required concomitant therapy with a diuretic and/or a betablocker. Finally, the frequency of drug induced side-effects necessitates a close and careful monitoring of all patients.

Zusammenfassung

In der vorliegenden Studie wurden 51 Patienten mit schwerer, auf eine standardisierte Dreiertherapie resistente Hypertonie (20 mit essentieller, 15 mit renovaskulärer und 16 mit renalparenchymatöser Hypertonie) mit dem oralen Converting enzyme Inhibitor Captopril behandelt. Die mittlere Behandlungszeit betrug 8,6 Monate für Patienten mit essentieller, 8,9 Monate für solche mit renovaskulärer und 9,9 Monate für Fälle mit renalparenchymatöser Hypertonie.

In allen 3 Patientengruppen konnte ein ausgeprägter und anhaltender Blutdruckabfall beobachtet werden. Allerdings war sowohl der absolute Blutdruckabfall als auch die individuelle Blutdruckantwort bei Patienten mit renovaskulärer Hypertonie ausgeprägter als bei solchen mit essentieller und renalparenchymatöser Hypertonie. Diese Ergebnisse weisen damit auf einen stärkeren antihypertensiven Effekt von Captopril bei Patienten mit renovaskulärer Hypertonie hin.

Unsere Resultate zeigen weiter, daß eine Monotherapie mit Captopril eher die Ausnahme als die Regel war. So benötigten über 90% der Patienten zusätzliche Gabe eines Diuretikums und ein weiterer Anteil der Patienten darüberhinaus die Gabe eines Betablockers (50% der Patienten mit essentieller, 38% der Fälle mit renalparenchymatöser und 26% der Patienten mit renovaskulärer Hypertonie).

Die Plasma-Renin-Aktivität stieg unter Captoprilbehandlung erwartungsgemäß an, während die Plasma-Aldosteron-Konzentration und die Converting enzyme Aktivität abfielen.

In 17,6% (n=9) der 51 Patienten konnten Nebenwirkungen (Exanthem, Pruritus, supraventrikuläre Extrasystolen, Tachykardie, Wasser- und Flüssigkeitsretention, Raynaud-Phänomen, unvollständiger und vollständiger Geschmacksverlust und Leukopenie) beobachtet werden.

Unsere Ergebnisse zeigen, daß Captopril bei schwerer therapieresistenter Hypertonie ein potentes Antihypertensivum ist. Dabei war bei unseren Patienten eine Monotherapie mit Captopril eher die Ausnahme als die Regel. So benötigten die meisten Patienten zusätzlich ein Diuretikum und/oder einen Betablocker. Allerdings erfordern die Nebenwirkungen des Medikaments eine engmaschige und genaue Überwachung aller Patienten.

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Studer, A., Lüscher, T., Siegenthaler, W. et al. Captopril in various forms of severe therapy-resistant hypertension. Klin Wochenschr 59, 59–67 (1981). https://doi.org/10.1007/BF01477284

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