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Whole blood impedance platelet aggregometry and ischemic heart disease. The Caerphilly Collaborative Heart Disease
P C Elwood1, A D Beswick, D S Sharp
1MRC Epidemiology Unit, Cardiff, South Wales, UK.
Insights
Increased platelet sensitivity is strongly linked to a higher risk of ischemic heart disease (IHD) in middle-aged men. This finding suggests platelet aggregation may be a significant indicator for heart disease risk.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Epidemiology
Background:
- The Caerphilly Collaborative Heart Disease Study investigated risk factors for heart disease in men aged 49-64.
- Platelet aggregation is a key factor in blood clot formation and cardiovascular events.
Purpose of the Study:
- To examine the association between platelet aggregation sensitivity and prevalent ischemic heart disease (IHD) in a cohort of men.
- To compare the strength of this association with traditional cardiovascular risk factors.
Main Methods:
- Studied a subsample of 308 men from the Caerphilly Collaborative Heart Disease Study cohort.
- Measured platelet aggregation sensitivity using adenosine diphosphate (ADP) and an aggregometer.
- Assessed prevalent IHD, including angina, myocardial infarction (MI), and electrocardiogram (ECG) evidence of ischemia.
Main Results:
- A marked association was found between higher platelet aggregation sensitivity and prevalent IHD.
- Odds ratios for IHD were significantly elevated in men with more sensitive platelets compared to those with less sensitive platelets (e.g., 7.3 for MI).
- These associations remained significant after accounting for potential confounding factors and were stronger than those for traditional risk factors like cholesterol, blood pressure, and smoking.
Conclusions:
- Platelet aggregation sensitivity is a significant independent risk factor for ischemic heart disease.
- The findings suggest that platelet function could be a valuable biomarker for identifying men at increased risk of IHD.
- Further research with larger sample sizes may refine the understanding of this relationship.
Abstract:
The Caerphilly Collaborative Heart Disease Study is based on a large cohort of men who were ages 49 to 64 years at the time of the study. We report the results for platelet aggregation measured in whole blood from a subsample of 308 men. The index of sensitivity used was the minimum concentration of adenosine diphosphate that produced a defined degree of impedance change in the Chronolog 560 aggregometer. There was a marked association between aggregation and prevalent ischemic heart disease (IHD). The odds ratios and 95% confidence intervals (CI) for prevalent IHD in men with the most sensitive platelets compared with those with the least sensitive platelets were 3.6 (95% Cl: 1.1 to 12.2) for angina; 7.3 (95% Cl: 2.0 to 24.3) for previous myocardial infarction (MI); and 2.7 (95% Cl: 1.0 to 7.6) for electrocardiogram evidence of ischemia. The confidence limits for these odds ratios are large because of the small sample size, but the estimates of odds ratio are relatively large compared to similar relationships between the traditional risk factors of serum cholesterol, blood pressure, smoking, and prevalent IHD (1.5 to 2.5). A number of factors that might confound the relationships between platelets and IHD were examined, but the associations remained statistically significant when these were taken into account.