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To assess the contribution of coronary artery ectasia, either isolated or in association with obstructive coronary artery disease, to morbidity and mortality from ischaemic heart disease. A retrospective study of patients undergoing coronary arteriography at a tertiary cardiac centre. The epidemiological, clinical, arteriographic, and follow up characteristics of three groups of patients were examined: group A, 172 patients with coronary artery ectasia and coexisting significant coronary artery disease; group B, 31 patients with coronary artery ectasia only; group C, 165 patients with significant coronary artery disease but without ectasia, matched for sex and age with group A. Group A patients had a similar incidence of a previous myocardial infarction to group C patients (61.6% v 64.2%), exercise performance, severity of obstructive lesions (CASS score 2.19 v 2 …