Summary
In seven patients with uncomplicated essential hypertension the effects of an acute alpha-adrenergic blockade, alone and combined with a chronic beta-adrenergic blockade, on blood pressure, renal function as measured by standard clearance methods, plasma renin activity, and plasma aldosterone were evaluated.
Acute alpha-adrenergic blockade with phentolamine (20 mg by intravenous infusion) significantly enhanced the antihypertensive effect of chronic beta-adrenergic blockade with slow-oxprenolol (160 mg/day×14 days) (−14.5% versus −7.4% for pulse pressure, −12.4% versus −6.0% for diastolic pressure, 2α<0.05). Under combined adrenergic blockade renal plasma flow increased, glomerular filtration rate and filtration fraction decreased (2α<0.05 each), whereas the fractional clearances of sodium, potassium, free water, and solute load remained unchanged. The activation of the renin-angiotensin-axis, elicited by alpha-adrenergic blockade alone, was suppressed by the preceding beta-adrenergic blockade.
These findings demonstrate a favourable antihypertensive action of a combined blockade of alpha-und beta-adrenergic receptor sites without untoward side effects on renal function or the renin-angiotensinaxis.
Zusammenfassung
Bei sieben Patienten mit unkomplizierter essentieller Hypertonie wurden unter Dauerinfusionsclearance-Bedingungen die Wirkungen einer akuten Blockade der Alpharezeptoren, allein oder in Kombination mit einer chronischen Betarezeptorenblockade, auf Blutdruck, Nierenfunktion, Plasmarenin und Aldosteron untersucht.
Akute Alphablockade mit Phentolamin (20 mg intravenös infundiert) verstärkte den blutdrucksenkenden Effekt einer chronischen Betablockade mit Slow-Oxprenolol (160 mg/Tag × 14 Tage) signifikant (−14,5% gegenüber −7,4% systolisch, −12,4% gegenüber −6% diastolisch, 2α jeweils <0,05). Unter der kombinierten Rezeptorenblockade nahmen der renale Plasmafluß zu, die glomeruläre Filtration und die Filtrationsfraktion ab (jeweils 2α<0,05), während die fraktionellen renalen Clearances von Natrium, Kalium, freiem Wasser und “solute load” unverändert blieben. Die Aktivierung der Renin-Angiotensin-Achse, die unter alleiniger Alpharezeptorenblockade auftrat, wurde durch vorausgehende Betarezeptorenblockade verhindert.
Diese Befunde zeigen einen günstigen blutdrucksenkenden Effekt einer akuten kombinierten Alphaund Betarezeptorenblockade, ohne unerwünschte Auswirkungen auf Nierenfunktion und Renin-Angiotensin-Achse.
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Grüninger, U., Akert, R., Hunkeler, H. et al. Akute kombinierte Alpha- und Betarezeptorenblockade bei essentieller Hypertonie: Wirkungen auf Blutdruck, Nierenfunktion, Renin und Aldosteron. Klin Wochenschr 57, 731–739 (1979). https://doi.org/10.1007/BF01477555
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DOI: https://doi.org/10.1007/BF01477555