White blood cell count and haematocrit as predictors of coronary recurrence after myocardial infarction

Area of Science:

• Cardiology
• Hematology
• Epidemiology

Background:

• Myocardial infarction survivors face risks of recurrent coronary events and mortality.
• Prognostic markers are crucial for identifying high-risk individuals post-myocardial infarction.
• Previous studies have explored various biomarkers, but the role of baseline white blood cell count (WCC) requires further elucidation.

Purpose of the Study:

• To investigate the relationship between baseline white blood cell count (WCC) and haematocrit with recurrent coronary events and all-cause mortality.
• To determine if WCC is a valuable prognostic variable in survivors of myocardial infarction.
• To explore potential mechanisms by which WCC might influence myocardial ischemia.

Main Methods:

• Analysis of baseline WCC and haematocrit in 2026 patients from the Persantin-Aspirin Reinfarction Study (PARIS-1).
• Follow-up for recurrent coronary events and all-cause mortality over 2-60 months post-myocardial infarction.
• Statistical analysis including multiple linear and logistic regression, controlling for confounding variables and treatment group.

Main Results:

• Baseline WCC was strongly associated with increased risk of coronary recurrence (relative risk 3.5) and total mortality (relative risk 2.6).
• No significant relationship was found between haematocrit and these outcomes.
• The association of WCC with adverse outcomes persisted after adjusting for smoking, diuretic use, serum cholesterol, uric acid, and treatment group (p < 0.001).

Conclusions:

• Baseline white blood cell count (WCC) is a significant and easily measurable prognostic variable for survivors of myocardial infarction.
• Elevated WCC may indicate increased risk for recurrent coronary events and mortality.
• Potential mechanisms involve white blood cells promoting myocardial ischemia through capillary plugging or release of toxic oxygen metabolites.