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Circadian variation in circulating platelet aggregates
1Department of Internal Medicine, Cumhuriyet University, School of Medicine, Sivas, Turkey.
Insights
Circulating platelet aggregates show significant daily variations, peaking in the early morning. This finding suggests optimizing the timing of anti-aggregating medications may improve treatment efficacy for cardiovascular events.
Area of Science:
- Cardiology
- Chronobiology
- Hematology
Background:
- Acute coronary events exhibit a circadian pattern, with increased incidence in the morning.
- Platelet aggregability is known to increase during morning hours.
Purpose of the Study:
- To investigate the presence and pattern of circadian variation in circulating platelet aggregates.
- To determine if in vivo platelet aggregation follows a daily rhythm in patients with atherosclerosis and healthy individuals.
Main Methods:
- In vivo platelet aggregation was measured at 3-hour intervals over a 24-hour period.
- Study included patients with atherosclerosis and healthy control subjects.
Main Results:
- A significant circadian variation in circulating platelet aggregates was observed.
- Peak levels of platelet aggregation occurred around 6 a.m., with the lowest levels around 9 a.m.
Conclusions:
- Circulating platelet aggregates display a distinct circadian rhythm.
- Timing of anti-aggregating drug administration should consider these daily variations in platelet activity for potentially enhanced therapeutic outcomes.
Abstract:
Acute coronary events are more likely to occur in the morning and it has recently been shown that platelet aggregability increases significantly then. To determine whether circulating platelet aggregates show such a circadian variation, we measured in vivo platelet aggregation in atherosclerotic patients and healthy subjects at three-hour intervals throughout a 24-hour period. We found a significant variation in circulating platelet aggregates, the highest being at 6 a.m. and the lowest at 9 a.m. We suggest that it may be important to consider the duration of action of anti-aggregating drugs and timing their administration with respect to circadian variation in circulating platelet aggregates.