Intravenous nitroglycerin in the treatment of spontaneous angina pectoris: a prospective, randomized trial

Circulation
G D CurfmanH L Fung

Abstract

A prospective, randomized study of i.v. nitroglycerin (TNG) in the management of repetitive spontaneous angina pectoris was undertaken in 40 consecutive patients. The clinical effectiveness of i.v. TNG (group A) was compared with that of oral isosorbide dinitrate (ISDN) and topical 2% nitroglycerin ointment (NO) in combination (group B) during a 72-hour treatment period. The doses of both nitrate regimens were adjusted so that the mean arterial pressure in the two groups was reduced by 15 +/- 3% of control values to the same level (77 mm Hg). The i.v. TNG dose of 10-200 micrograms/min yielded arterial plasma TNG levels of 1.2-65.3 ng/ml and estimated plasma (arterial) clearance of 106 +/- 55 ml/min/kg of body weight (mean +/- SD). In group B, the doses were 20-60 mg (oral ISDN) and 1/2-2 inches (NO) every 6 hours. Intravenous TNG reduced the number of spontaneous ischemic episodes from 3.3 +/- 0.8 per 24 hours during the control period to 1.0 +/- 0.3 per 24 hours during the treatment period (p less than 0.01), while the ISDN/NO combination reduced the number of episodes from 3.1 +/- 0.4 to 1.4 +/- 0.3 (p less than 0.01). Overall, the magnitude of the therapeutic effect of i.v. TNG was statistically indistinguishable from that o...Continue Reading

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