A56-year-old man was admitted with shortness of breath and a painful and pulseless cold left leg. A successful surgical embolectomy from the left femoral artery was performed. A ventilation-perfusion lung scan was consistent with multiple pulmonary emboli. Two months previously, the patient had an anterolateral non–Q-wave myocardial infarction. At coronary arteriography, the coronaries were normal apart from mild (40%) plaque disease in the proximal left anterior descending artery. He had deep venous thrombosis of the left leg …