Efficacy of long-term administration of transdermal nitroglycerin in asymptomatic patients with effort-induced silent myocardial ischemia.
The aim of our study was to investigate the effect of transdermal nitroglycerin (NTG) on effort-induced silent myocardial ischemia in asymptomatic patients treated with beta-blockers or calcium antagonists. The acute effect was compared to two different schedules, continuous (24 h/day) or intermittent (16 h/day), of long-term administration. Ten asymptomatic patients with coronary artery disease and a treadmill test positive for ischemia without angina were enrolled. Both acute (2 days) and long-term (24 days) evaluations were conducted in a randomized, double-blind, crossover fashion. The ergometric parameters were collected on the 1st and the 2nd day of the acute phase (placebo and transdermal NTG, respectively) and at the end of each 12-day period of long-term administration (continuous and intermittent, respectively). Transdermal NTG administration acutely increased (p < 0.05) both time to 1-mm ST segment depression (451 +/- 43.2 vs. 374 +/- 24.1 s) and total exercise time (561.3 +/- 43.2 vs. 419.5 +/- 24.5 s). The acute efficacy was maintained over long-term treatment, regardless of the modality of administration. During continuous and intermittent patch application, time to 1-mm ST segment depression was 437.9 +/- 30.4 and 422 +/- 33.4 s (p = NS vs. acute) and total exercise time was 498.8 +/- 30.4 and 495.1 +/- 33 s (p = NS vs. acute), respectively. Transdermal NTG increases, both acutely and chronically, exercise tolerance in asymptomatic patients with effort-induced silent myocardial ischemia. With the NTG dose we used, tolerance does not seem to be a problem over long-term administration.
Rubboli
A
A
Section of Cardiology, Maggiore Hospital, Bologna, Italy.
Sangiorgio
P
P
Pavesi
P C
PC
Casella
G
G
Mezzetti
M
M
Bracchetti
D
D
D000279:Administration, Cutaneous; D000328:Adult; D000368:Aged; D003327:Coronary Disease / Q000150:complications; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D005080:Exercise Test; D017079:Exercise Tolerance / Q000187:drug effects; D005260:Female; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000188:drug therapy* / Q000209:etiology / Q000503:physiopathology; D005996:Nitroglycerin / Q000008:administration & dosage* / Q000627:therapeutic use
D005996:Nitroglycerin