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Ambulante kontinuierliche 24 h Blutdruckregistrierung in der Diagnostik und Therapie der arteriellen Hypertonie und die Beeinflussung durch die Antihypertensiva Enalapril, Metoprolol, Mepindolol und Nitrendipin

Continous ambulatory 24-h blood pressure monitoring in diagnosis and therapy of arterial hypertension — antihypertensiva: Enalapril, metoprolol, mepindolol and nitrendipin

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Summary

After improvement of technical equipment continuous ambulatory blood pressure monitoring is more and more used in the diagnosis of hypertension. New fully automatic systems permit a reliable registration and evaluation of 24-h blood pressure profiles. Typical circadian rhythmics of blood pressure, independent of a variability with different grades of activity, can be demonstrated in normotensive persons and also in patients with essential hypertension. Patients with secondary forms of hypertension show a nivellation or offset of circadian blood pressure rhythmics. A study was performed to examine the antihypertensive efficacy of the calcium antagonist Nitrendipine, theβ 1-adrenoceptor-selective blocker Metoprolol, theβ-blocker with intrinsic activity Mepindolol and the angiotensin converting enzyme inhibitor Enalapril in patients with mild to moderate hypertension over a period of 6 month. Continuous ambulatory blood pressure monitoring was performed before and after 6 month of therapy. 98 of 299 included patients broke off therapy, 47 of those because of side effects. Hydrochlorothiazide was given additionally if the antihypertensive effect of monotherapy was not sufficient after a period of 4 weeks. Morning blood pressure controls at the end of the treatment period showed normotensive values in all groups without significant differences between the groups before and at the end of the treatment period. The number of prescriptions of diuretics necessary to achieve normotension differed between the four treatment groups: Nitrendipine (n=5), Metoprolol (n=7), Mepindolol (n=14), Enalapril (n=20).

In contrast to the morning blood pressure values the continuous 24-h blood pressure monitoring demonstrated significant differences between the therapy groups. Metoprolol turned out as most effective in lowering blood pressure and in reducing the number of systolic blood pressure peaks above 180 mmHg, but on the other hand showed the highest incidence of relative hypotension (<100 mmHg systolic, <80 mmHg diastolic). Mepindolol demonstrated a significant lower efficacy. In the Nitrendipin group least of all prescriptions of diuretics were necessary and the lowest number of hypotensive systolic blood pressure values occurred. Enalapril showed the most significant reduction of diastolic values above 100 mmHg and the lowest number of diastolic values below 80 mmHg, but the highest number of prescription of diuretics was necessary in the Enalapril group. In none of the four therapy groups a neutralisation of circadian blood pressure rhythmics was demonstrable.

Zusammenfassung

Durch technische Verbesserungen der Meßgeräte findet die nichtinvasive kontinuierliche Blutdruckmessung in zunehmendem Umfang Anwendung in der Hypertoniediagnostik. Neue vollautomatische Meßgeräte erlauben eine zuverlässige Registrierung und Auswertung von 24 Stunden Blutdruckprofilen. Unabhängig von aktivitätsbedingten Blutdruckschwankungen findet sich bei normotonen Personen und auch bei Patienten mit primärer Hypertonie ein typischer circadianer Rhythmus des Blutdrucks. Patienten mit sekundären Hypertonieformen zeigen eine Abflachung oder Aufhebung des circadianen Blutdruckrhythmus. In einer Studie wurde die Wirksamkeit des Calciumantagonisten Nitrendipin, desβ 1-selektiven Blockers Metoprolol, des ISA-β-blockers Mepindolol und des ACE-Hemmers Enalapril über einen Zeitraum von 6 Monaten bei Patienten mit leichter bis mittelschwerer Hypertonie untersucht. Eine 24 h Blutdruckregistrierung erfolgte vor und nach 6-monatiger Therapie. Von 299 eingeschlossenen Patienten brachen 98 Patienten die Studie ab, davon 47 wegen unerwünschter Wirkungen. Bei nichtausreichender Wirksamkeit der Monotherapie wurde nach 4 Wochen zusätzlich Hydrochlorothiazid verordnet. Die morgendlichen Ambulanzblutdruckwerte lagen in allen Gruppen am Ende des Beobachtungszeitraums im normotonen Bereich, ohne daß signifikante Unterschiede zwischen den Gruppen vor und am Ende der Studie bestanden. Zu diesem Therapieerfolg war eine unterschiedliche Anzahl von Diuretikaverordnungen notwendig: Nitrendipin (n=5), Metoprolol (n=7), Mepindolol (n=14) und Enalapril (n=20).

Trotz der vergleichbaren morgendlichen Blutdruckwerte ergaben sich in der 24 h Blutdruck-Registrierung z.T. deutliche Unterschiede. Metoprolol zeigte den deutlichsten blutdrucksenkenden Effekt und reduzierte systolische Blutdruckspitzen über 180 mmHg am effektivsten; wies aber auch die höchste Inzidenz von relativ hypotonen Werten (<110/<80 mmHg) auf. Eine wesentlich geringere Wirkung wies Mepindolol auf. Nitrendipin benötigte die geringste Anzahl zusätzlicher Diuretikaverordnungen und wies die geringste Anzahl von hypotonen systolischen Werten auf. Enalapril wies die deutlichste Reduktion von diastolischen Werten über 100 mmHg auf, und zeigte die geringste Anzahl von diastolischen Werten unter 80 mmHg, benötigte allerdings am häufigsten ein Diuretikum. Die Blutdrucktagesrhythmik wurde in keiner der 4 Therapiegruppen aufgehoben.

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Schrader, J., Schoel, G., Buhr-Schinner, H. et al. Ambulante kontinuierliche 24 h Blutdruckregistrierung in der Diagnostik und Therapie der arteriellen Hypertonie und die Beeinflussung durch die Antihypertensiva Enalapril, Metoprolol, Mepindolol und Nitrendipin. Klin Wochenschr 66, 928–939 (1988). https://doi.org/10.1007/BF01728957

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