Circadian rhythm and cardiovascular disease

Area of Science:

• Cardiovascular Physiology
• Chronobiology
• Internal Medicine

Background:

• Cardiovascular diseases (CVD) like myocardial infarction (MI), sudden cardiac death (SCD), and stroke exhibit a notable variation in their frequency of onset.
• Understanding the mechanisms underlying the transition from chronic stable disease to acute, unstable manifestations is crucial for effective management and prevention.

Purpose of the Study:

• To investigate the role of circadian variations in the onset of acute cardiovascular events.
• To explore the physiological mechanisms contributing to the morning peak in CVD events.
• To identify potential triggers for disease onset, including external stressors.

Main Methods:

• Analysis of the temporal patterns of myocardial infarction, sudden cardiac death, and stroke onset.
• Correlation of event frequency with daily physiological fluctuations.
• Examination of factors such as arterial pressure, heart rate, vascular tone, platelet reactivity, and fibrinolytic activity.

Main Results:

• Demonstrated a significant circadian variation in the frequency of onset for myocardial infarction, sudden cardiac death, and stroke.
• Identified a morning peak in physiological factors including arterial pressure, heart rate, and vascular tone.
• Observed increased platelet reactivity and reduced fibrinolytic activity in the morning, potentially promoting plaque rupture.

Conclusions:

• Circadian variations play a critical role in the acute manifestation of cardiovascular disease.
• Physiological changes peaking in the morning contribute to increased risk of plaque rupture and thrombotic events.
• Further research into circadian rhythms may reveal novel strategies for preventing cardiovascular disease onset.