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Heart 2000;84:41-45; doi:10.1136/heart.84.1.41
Copyright © 2000 BMJ Publishing Group Ltd & British Cardiovascular Society
Heart 2000;84:41-45 ( July )

Cardiovascular medicine

Influence of previous aspirin treatment and smoking on the electrocardiographic manifestations of injury in acute myocardial infarction S Kennonc, K Barakata, A Sulimanc, P K MacCallumb, K Ranjadayalanc, P Wilkinsond, A D Timmisa

a Department of Cardiology, Royal Hospitals Trust, London E1, UK, b Department of Haematology, Royal Hospitals Trust, c Department of Cardiology, Newham Healthcare Trust, London E13, UK, d Department of Environmental Epidemiology, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1, UK

Correspondence to: Dr Simon Kennon, Heart and Chest Clinic, Southend Hospital, Westcliffe-on-Sea, Essex SS0 0RY, UK email: srok{at}dircon.co.uk

Accepted 23 March 2000

OBJECTIVE---To examine demographic and clinical characteristics of patients with acute myocardial infarction in order to identify factors affecting the electrocardiographic evolution of injury.
METHODS---Prospective cohort study of 1399 consecutive patients with a first myocardial infarction. Baseline clinical data associated with ST elevation and Q wave development were identified and 12 month survival was estimated.
RESULTS---Smoking had complex effects on the evolution of injury, increasing the odds of ST elevation (odds ratio (OR) 1.61; 95% confidence interval (CI) 1.08 to 2.36), but reducing the odds of Q wave development (OR 0.69, 95% CI 0.49 to 0.96). The effects of previous aspirin treatment were more consistent with reductions in the odds of ST elevation (OR 0.57, 95% CI 0.35 to 0.94) and Q wave development (OR 0.53, 95% CI 0.34 to 0.84). ST elevation and Q wave development were both associated with an adverse prognosis, with estimated 12 month survival rates of 80.6% (95% CI 78.2% to 83.1%) and 80.0% (95% CI 77.5% to 82.5%), respectively, compared with 86.5% (95% CI 81.2% to 91.9%) and 89.9% (95% CI 86.2% to 93.7%) for patients without these ECG changes.
CONCLUSIONS---The thrombogenicity of the blood may be a major determinant of infarct severity. Smoking increases thrombogenicity and the likelihood of ST elevation, but because coronary occlusion is relatively more thrombotic in smokers, responses to both endogenous and exogenous thrombolysis are better, reducing the risk of Q wave development. Previous aspirin treatment reduces thrombogenicity, protecting against ST elevation and Q wave development.


Keywords: myocardial infarction; smoking; aspirin

© 2000 by Heart
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