Acute myocardial infarction (AMI) patients may suffer from constipation for various reasons. Constipation may lead to flatulence in enteric cavity, raised diaphragm, reflex affected heart rate and coronary blood flow. Meanwhile, venous thrombus is suctioned during forced defecation to easily cause pulmonary embolism. The pressure in right atrium is increased and the blood flow rate during diastole is decreased, resulting in relative coronary ischemia in narrow lumen and increased anaerobic metabolism of heart muscle. All these induce severe arrhythmia and paroxysmal dyspnea, and even result in death [1]. Hence, keeping bowels open is significant to the treatment and rehabilitation of AMI patients. This paper presents the study.