PMID: 9180126Jun 1, 1997Paper

Differential activation of cardiac and peripheral sympathetic nervous system by nifedipine: role of pharmacokinetics

Journal of the American College of Cardiology
R R WenzelG Noll

Abstract

We sought to study the effects of short-acting and long-acting nifedipine on the sympathetic nervous system (SNS), heart rate (HR) and blood pressure (BP) of normotensive subjects under baseline conditions and during SNS stimulation. Calcium channel antagonists in different pharmacokinetic formulations are widely used in patients with coronary artery disease or hypertension. Short-acting formulations activate the SNS, an action that may be disadvantageous in patients with coronary disease, especially if left ventricular function is impaired. The effects of slow-release formulations on the SNS are unknown. We used microneurography to investigate the influence of nifedipine (5 mg; 10 mg; and slow-release [GITS], 60 mg) on muscle sympathetic nerve activity (MSA) and skin sympathetic nerve activity (SSA) in healthy volunteers. Peak plasma levels after short-acting and slow-release nifedipine were achieved within 60 min and 330 min, respectively. Short-acting (10 mg, n = 10) and slow-release (n = 10) nifedipine, but not placebo, markedly activated MSA and increased plasma norepinephrine; plasma endothelin increased only with slow-release nifedipine. HR increased after short-acting nifedipine, but not after nifedipine GITS. Nifedipin...Continue Reading

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