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ABO blood group system, age, sex, risk factors and cardiac infarction
Insights
This study found that blood group A is significantly linked to a higher risk of cardiac infarction in both older and younger adults. This association appears to be independent of common cardiovascular risk factors, suggesting a genetic component.
Area of Science:
- Cardiology
- Genetics
- Epidemiology
Background:
- Cardiac infarction (heart attack) is a leading cause of mortality worldwide.
- Established risk factors include hypertension, diabetes mellitus, hyperlipemia, and smoking.
- The role of genetic factors, such as blood groups, in cardiac infarction risk requires further investigation.
Purpose of the Study:
- To investigate the relationship between ABO blood group and cardiac infarction.
- To determine if this association is independent of traditional cardiovascular risk factors.
- To assess the influence of age on the blood group-cardiac infarction link.
Main Methods:
- Retrospective study of 450 patients with cardiac infarction, divided into two age groups (≥65 years and <65 years).
- Analysis of blood group distribution in patients with and without cardiac infarction.
- Statistical analysis (Chi-square test) to assess significance, including analysis after excluding patients with major risk factors (hypertension, hyperuricemia, diabetes mellitus, smoking, hyperlipemia).
Main Results:
- Blood group A showed a highly significant predominance in patients with cardiac infarction across both age groups (P < 0.005).
- After excluding patients with major risk factors, the association of blood group A with cardiac infarction remained significant, and even stronger in the elderly (P < 0.001).
- A lower, but still significant, association was observed in younger patients (P < 0.05).
Conclusions:
- Blood group A is a significant independent risk factor for cardiac infarction.
- A genetic factor associated with blood group A contributes to a greater incidence of cardiac infarction.
- The findings highlight the importance of considering genetic predisposition in cardiac infarction risk assessment.
Abstract:
In a retrospective study in 3100 patients of different ages the relationship between blood group and cardiac infarction was investigated in 450 patients. The patients were divided in two age groups: those who were 65 yr old and older and younger patients (age less than 65 yr). The predominance of blood group A in patients with cardiac infarction was highly significant in both age groups (P less than 0.005, two-tailed Chi-square test). Step-wise excluding all patients with at least one of the risk factors, hypertension, hyperuricemia, diabetes mellitus, smoking, and hyperlipemia similar results were found: the predominance of blood group A in the elderly patients with cardiac infarction was even higher than before excluding the risk factors (P less than 0.001). The predominance of blood group A was also demonstrated at a lower level in younger patients with cardiac infarction (P less than 0.05). Our investigation strongly suggests the existence of a genetic factor associated with blood group A and independent of the other risk factors which is also responsible for a greater incidence of cardiac infarction.