Need for beta-blockade in hypertension reduced with long-term minoxidil.

Area of Science:

• Cardiology
• Pharmacology

Background:

• Severe hypertension requires multifaceted treatment strategies.
• Minoxidil is a potent vasodilator used for refractory hypertension.

Purpose of the Study:

• To assess the impact of minoxidil on hormonal activity and the necessity of concomitant beta-blockade in severe hypertension.
• To evaluate the long-term effects of minoxidil on plasma renin activity and urinary aldosterone and noradrenaline levels.

Main Methods:

• Eight patients with severe hypertension received escalating doses of minoxidil.
• Plasma renin activity and urinary aldosterone and noradrenaline were measured sequentially.
• Beta-blockers were gradually withdrawn in some patients to assess their continued need.

Main Results:

• Minoxidil significantly reduced blood pressure within one week.
• Initial increases in plasma renin activity and urinary aldosterone/noradrenaline returned to baseline within 2-3 weeks.
• Beta-blockade withdrawal was tolerated in most patients, with minimal need for reintroduction.

Conclusions:

• Long-term minoxidil treatment can significantly reduce or eliminate the requirement for beta-blockers in severe hypertension.
• Minoxidil's hormonal effects are transient, suggesting sustained efficacy without continuous beta-blockade.
• This study highlights a potential simplification of antihypertensive regimens for patients on minoxidil.