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Does cimetidine alter the cardiac response to exercise and propranolol?
Insights
Cimetidine, an H2-antagonist, does not appear to cause cardiac side-effects in healthy individuals during exercise. Combining cimetidine with propranolol (a beta-blocker) also showed no adverse cardiac effects in this group.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Histamine (H) receptors are present in the heart.
- Cimetidine is an H2-antagonist used for peptic ulcers.
- Potential cardiac side-effects of cimetidine, especially during exercise, are unknown.
Purpose of the Study:
- To investigate the cardiac side-effects of cimetidine.
- To assess the impact of cimetidine on the cardiac response to exercise.
- To evaluate potential interactions between cimetidine and propranolol.
Main Methods:
- 10 healthy subjects underwent treadmill exercise.
- Cardiovascular responses (heart rate, blood pressure) were monitored.
- Effects of cimetidine alone and in combination with propranolol were assessed.
Main Results:
- Cimetidine did not alter heart rate or blood pressure response to exercise.
- Cimetidine did not exaggerate the effects of propranolol (beta-blockade).
- No adverse cardiac events were observed in healthy subjects.
Conclusions:
- Cimetidine appears safe regarding cardiac function and exercise response in healthy individuals.
- Cimetidine and propranolol can likely be used concurrently in healthy patients.
- Further studies are needed in patients with ischemic heart disease to assess combined effects.
Abstract:
The recent discovery of histamine (H) receptors in the heart raises the possibility that the H2-antagonist drug, cimetidine, used in the therapy of peptic ulcer, might have cardiac side-effects and might impair the cardiac response to exercise. In 10 normal subjects, cimetidine did not alter the normal heart rate and blood pressure response to treadmill exercise, nor was the effect of beta-blockade by propranolol exaggerated. Thus it appears that the use of propranolol is not necessarily a contraindication to cimetidine therapy, or vice versa. However, further trials on patients with ischaemic heart disease are required to exclude any additive effects of cimetidine and propranolol on the diseased heart.