PMID: 11923046Mar 30, 2002Paper

The effect of supplemental L-arginine on tolerance development during continuous transdermal nitroglycerin therapy

Journal of the American College of Cardiology
John O ParkerW H Kaesemeyer

Abstract

This study was designed to assess the effect of oral L-arginine on the development of tolerance during continuous transdermal nitroglycerin (TD-GTN) therapy. Continuous TD-GTN therapy leads to complete tolerance within 24 to 48 h. The mechanism(s) responsible for nitrate tolerance are unclear, but there is increasing evidence that nitroglycerin (GTN) leads to superoxide anion production. The trigger for this is unknown, but there is evidence that GTN alters nitric oxide synthase (NOS) function and also leads to reduced L-arginine availability at its site of action with NOS. Fourteen patients with stable angina pectoris and reproducible treadmill walking time (TWT) until the onset of moderate angina were studied in a placebo-controlled, crossover study. Transdermal GTN (0.4 mg/h) was applied daily for two periods of 5 to 10 days with the patch left in place for 24 h each day. Capsules containing L-arginine (700 mg) or placebo were administered four times daily during a period of TD-GTN therapy. Treadmill walking time was determined before and 4 h after study capsules on day 1 before TD-GTN to assess the effect of L-arginine on exercise performance. On the last day, TWT was determined at 0 h (24 h after TD-GTN and 9 h after study...Continue Reading

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