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The circadian rhythm of angina pectoris

C R Taylor1, E M Hodge, D A White

  • 1Pfizer International Inc., 235 East 42nd Street, New York, NY 10017, USA.

Journal of Cardiovascular Pharmacology
|January 1, 1991
PubMed

Insights

Angina attacks exhibit a morning peak, similar to heart attacks. This circadian pattern, more pronounced with exertion, persisted despite beta-blocker treatment in chronic stable angina patients.

Area of Science:

  • Cardiology
  • Circadian Biology
  • Epidemiology

Background:

  • Chronic stable angina affects numerous patients worldwide.
  • Understanding the temporal patterns of angina is crucial for patient management.
  • Previous studies noted circadian patterns in cardiovascular events like myocardial infarction.

Purpose of the Study:

  • To analyze the circadian pattern of angina attacks in patients with chronic stable angina.
  • To investigate the influence of physical exertion on this pattern.
  • To assess the effect of beta-blocker therapy on the morning peak of angina.

Main Methods:

  • Diary card data from 33,999 angina attacks were analyzed.
  • Data were collected from 1,022 patients diagnosed with chronic stable angina.
  • Statistical analysis was performed to identify circadian patterns and influencing factors.

Main Results:

  • A distinct circadian pattern in angina frequency was observed, peaking in the morning.
  • The majority of angina episodes were linked to physical exertion.
  • The morning peak was more significant in exertional angina compared to nonexertional angina.
  • Beta-blocker treatment did not abolish the morning peak of angina attacks.

Conclusions:

  • Angina attacks in chronic stable angina patients follow a circadian rhythm with a morning predominance.
  • Physical exertion exacerbates this morning pattern.
  • Current beta-blocker therapy may not fully mitigate the risk of morning angina episodes.

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