Myocardial infarction and the intrinsic calibre of coronary arteries.

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Abstract
Measurements of intrinsic coronary artery caliber, at sites free from plaques, are reported for representative series of control and infarction cases, using radiographs of postmortem coronary angiograms. As measured under these conditions, the caliber isolatedwith age in both groups. At each individual age the arteries of the infarction group were smaller than those of control subjects. Analysis in relation to physical activity of occupation in men showed that among active and heavy workers the cross-sectional area for infarction-free subjects was 75% greater than in the corresponding infarction groups, this difference being highly significant. Among light workers there was little difference. There was some suggestion that in control subjects active work tends to be associated with larger arteries.