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[Calcium antagonists in severe stable post-infarct angina pectoris]
Insights
Nifedipine significantly reduced angina episodes and improved exercise capacity in patients with severe post-myocardial infarction angina. This calcium antagonist demonstrated beneficial effects on myocardial circulation.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Severe stable angina post-myocardial infarction (MI) significantly impacts patient quality of life.
- NYHA class III and IV angina indicates a substantial limitation of physical activity.
Purpose of the Study:
- To evaluate the efficacy of nifedipine in managing severe stable angina following myocardial infarction.
- To assess the impact of nifedipine on anginal episodes and exercise tolerance.
Main Methods:
- A double-blind, placebo-controlled, crossover study involving 50 patients with severe stable post-MI angina.
- Patient outcomes were assessed using angina bout frequency, nitroglycerin consumption, and the Bruce exercise test.
Main Results:
- Nifedipine treatment resulted in a significant reduction in anginal crises (p=0.0062).
- A statistically significant improvement in exercise capacity was observed compared to baseline (p<0.001).
- Favorable outcomes were noted in 36 out of 50 patients.
Conclusions:
- Nifedipine demonstrates a beneficial effect in patients suffering from severe stable post-MI angina.
- The drug may exert preferential actions on myocardial circulation, contributing to symptom relief and improved functional capacity.
Abstract:
In 50 patients with severe stable post-myocardial infarction angina grade III and IV of the N. Y. Heart Association, a calcium antagonist (niphedipine) was used in a double blind study with intercrossing. For the experimental design the same patient was his own control. The following criteria were used: number of bouts of angina, consumption of nitroglycerin pearls to control the angina, excercise test (Bruce technic), at the beginning and at the end of each treatment., Favourable results were observed in 36 of the 50 patients, in relation to the number of anginal crisis with a "p" value equal to 0.0062. In the effort capacity an improvement in relation to the basal conditions was observed with a "p" value less than 0.001. This shows a beneficial action of the drug with possible preferent actions on myocardial circulation.