Abstract: To investigate the clinical features of acute myocardial infarction(AMI)in patients with cor pulmonale. Manifestations of AMI in 20 patients with cor pulmonale(observation group)was compared to that of 168 patients with AMI only(control group).The incidence of acute left ventricular failure and cardiogenic shock in observation group(75.0% and 45.0%)was significantly higher than those in the control group(20.8% and 20.8%).All the patients in the observation group were accompanied with serious lung infection.The incidence of chest pain in observation group(35.0%)was significantly lower than that in the control group(83.3%).The mortality in observation group(40.0%)was significantly higher than that in control group(12.5%). Infection is an important precipitating factor in acute myocardial infarction characteristic of painlessness in patients with cor pulmonale.Acute left ventricular failure and cardiogenic shock etc,can be the initial symptoms of AMI.Because of its high mortality and poor prognosis,more attention should be paid to these symptoms.

Key words: cor pulmonale, myocardial infarction, clinical feature