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[Consequences of circadian variability for the treatment of ischemic heart disease]
T Herren1, P Urban, W Rutishauser
1Centre de cardiologie, Hôpital cantonal universitaire, Genève Medizinische Universitätsklinik, Inselspital, Bern.
Insights
Optimal timing for cardiac event therapy is crucial. Nitrates should be taken in the morning after a nightly break, while aspirin can be taken anytime for managing ischemic cardiac events.
Area of Science:
- Cardiology
- Chronobiology
Context:
- Ischemic cardiac events, including myocardial infarction and sudden death, exhibit a circadian rhythm, peaking in the early morning hours.
- While the highest incidence occurs in the morning, the majority of events happen throughout the day, necessitating sustained therapeutic efficacy.
Purpose:
- To evaluate the optimal timing and formulation of medications for managing ischemic cardiac events based on their circadian patterns.
- To provide recommendations for nitrate, beta-blocker, and aspirin therapy in relation to circadian rhythms.
Summary:
- Nitrate therapy should commence early in the morning following an overnight dose-free interval to align with peak event incidence.
- Beta-blocker therapy does not appear to be influenced by circadian rhythms in ischemic cardiac events.
- Long-acting formulations are recommended for improved patient compliance, and aspirin can be administered at any time due to its prolonged action.
Impact:
- Individualized therapy tailored to patient needs and medication pharmacokinetics is essential for effective management of circadian-related cardiac events.
- Further research is needed to determine the influence of calcium blockers on the circadian rhythm of ischemic cardiac events.
Abstract:
The incidence of ischemic cardiac events is highest in the early morning hours (symptomatic and asymptomatic cardiac ischemia, myocardial infarction, and sudden death). Quantitatively, however, most of them occur during the rest of the day; therefore, an ideal therapy should be established in the early morning hours and be efficient all day long. We recommend that nitrates should be taken as early as possible after a dose-is-free interval during the night. Patients taking beta-blockers do not show a circadian rhythm of the incidence of ischemic cardiac events. Compliance can be improved with the never long-acting agents. Therapy should be tailored individually for each patient. It is not yet known whether calcium blockers influence the circadian rhythm. The efficacy of the never preparations is comparable to the older ones. Aspirin can be taken at any time of the day because of its long duration of action.
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