Increased Incidence of Deep Vein Thrombosis after Myocardial Infarction in Non-smokers

Out of 102 patients with cardiac infarction admitted to the coronary care unit at this hospital and not treated with anticoagulants 30 (29%) developed isotopic evidence of deep vein thrombosis. Of the 65 smokers only 7 (11%) developed a deep vein thrombosis, whereas of the 37 non-smokers 23 (62%) developed a deep vein thrombosis. This difference is highly significant (P < 0·00001).