Clinical factors associated with pain in acute myocardial infarction.

In an unselected population of 921 consecutive patients with acute myocardial infarction admitted to one single hospital, regardless of age and whether they were admitted to the coronary care unit or not, we describe the course of pain during hospitalization. Patients with a history of angina pectoris, patients with a particularly long delay time, and patients not transported by ambulance had the longest duration of pain.