Circadian variations in cardiovascular disease: implications for treatment
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Updated: Oct 3, 2026
Hydra, a Computer-Based Platform for Aiding Clinicians in Cardiovascular Analysis and Diagnosis
Published on: September 26, 2018
1Cardiology Branch, National Institutes of Health, Bethesda, Maryland 20892.
Insights
Cardiovascular disease events like heart attacks peak in the morning. Medications such as beta-blockers, calcium antagonists, and aspirin can help prevent these morning cardiovascular events.
Area of Science:
- Cardiology
- Chronobiology
- Preventive Medicine
Background:
- Cardiovascular disease events, including myocardial infarction and sudden cardiac death, exhibit a distinct circadian pattern, with a notable increase in the early morning hours.
- This diurnal variation has prompted research into the physiological triggers and underlying causes of these events, particularly concerning silent and symptomatic myocardial ischemia.
Purpose of the Study:
- To review and analyze recent studies on circadian patterns in cardiovascular disease processes.
- To investigate the relationship between morning cardiovascular events and physiological triggers.
- To evaluate the efficacy of pharmacological interventions in mitigating morning cardiovascular risks.
Main Methods:
- Review of existing literature and analysis of findings from recent studies on circadian rhythms in cardiovascular disease.
- Examination of physiological triggers and underlying causes of morning myocardial infarction and sudden cardiac death.
- Assessment of the impact of beta-adrenergic blockers, calcium antagonists (e.g., amlodipine), and aspirin on cardiovascular event timing.
Main Results:
- Beta-adrenergic blockers effectively abolish the early morning peak incidence of myocardial infarction and reduce the morning peak of sudden cardiac death.
- Calcium antagonists, specifically amlodipine, demonstrate efficacy in controlling angina throughout a 24-hour period.
- Aspirin has been shown to be effective in preventing morning myocardial infarction.
Conclusions:
- Circadian patterns significantly influence cardiovascular disease processes, with a pronounced risk in the early morning.
- Pharmacological interventions, including beta-blockers, amlodipine, and aspirin, can effectively mitigate morning cardiovascular events.
- Further research should focus on extending treatment progress in cardiovascular disease to encompass preventive strategies targeting circadian variations.
Abstract:
This review describes circadian patterns in cardiovascular disease processes and analyses the findings of recent studies. The awareness of an increased incidence of myocardial infarction and sudden cardiac death in the early morning hours, shortly after waking, has stimulated an interest in the relationship of these events and the occurrence of both silent and symptomatic myocardial ischaemia. A number of studies have been reported that examine both the physiological triggers and the underlying causes of these events. Beta-adrenergic blockers have been shown to abolish the early morning peak of myocardial infarction and blunt the morning peak in sudden cardiac death. Newer calcium antagonists, such as amlodipine, have been demonstrated to control angina throughout a 24-hour period. Aspirin is effective in preventing morning infarction. It is a reasonable aim for investigators to extend progress in the treatment of cardiovascular disease to include prevention.
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