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[Plasma renin and noradrenalin levels during hypotensive therapy using acebutolol (author's transl)]
Insights
Acebutolol effectively lowers pulse rate, blood pressure, and plasma renin activity in hypertensive patients. It also reduces the body's noradrenergic response to standing, suggesting potential central effects.
Area of Science:
- Pharmacology
- Cardiovascular Medicine
- Hypertension Research
Context:
- Essential hypertension management
- Beta-blocker efficacy
- Orthostatic vital signs monitoring
Purpose:
- To evaluate the effects of acebutolol on cardiovascular and hormonal parameters in patients with essential hypertension.
- To investigate the influence of acebutolol on plasma noradrenaline and plasma renin activity under varying physiological conditions (rest, orthostasis, exercise).
- To explore the relationship between baseline hormonal levels and blood pressure response to acebutolol treatment.
Summary:
- Acebutolol (800 mg/day for 3 days) significantly reduced pulse rate, blood pressure, and plasma renin activity in nine hypertensive patients across resting, standing, and post-exercise states.
- The drug demonstrated a notable reduction in the orthostatic stimulation of plasma noradrenaline, indicating a potential central or presynaptic mechanism of action.
- Blood pressure response to acebutolol correlated positively with initial plasma renin activity (post-exercise) and plasma noradrenaline (orthostatic), suggesting predictive value for these hormonal markers.
Impact:
- Acebutolol's antihypertensive action may not solely rely on inhibiting noradrenergic response, as blood pressure decreased without significant changes in horizontal plasma noradrenaline.
- Measurement of plasma renin activity and plasma noradrenaline holds predictive value for acebutolol's efficacy in short-term treatment under controlled conditions.
- Findings contribute to understanding acebutolol's mechanism of action and optimizing its use in essential hypertension management.
Abstract:
The effects of acebutolol (800 mg per day for three days) on pulse rate, blood pressure, plasma noradrenaline and plasma renin activity were measured in nine patients with essential hypertension, at rest in a horizontal position, after five minutes standing upright and after walking for one hour. Acebutolol reduced pulse rate, blood pressure and plasma renin activity in all three positions. Treatment has no influence on plasma noradrenaline in a horizontal position, but significantly reduced its orthostatic stimulation. The inhibition of noradrenergic response to an orthosatic position is compatible with a central or presynaptic effect of acebutolol. This effect would not appear to be essential to its antihypertensive action since acebutolol reduced blood pressure but not plasma noradrenaline in a horizontal position. Blood pressure response to treatment was positively correlated to initial values of plasma renin activity measured after walking for one hour and plasma noradrenaline measured after five minutes in an orthostatic position. On the basis of this correlation, measurement of these two hormonal indices is of predictive value, within the limits of a short period of treatment with acebutolol and strictly defined hospital conditions.