To explore the clinical efficacy of Biantong Capsule in prevention of constipation and cardiovascular reaction of patients with acute myocardial infarction after percutaneous transluminal coronary angioplasty (PTCA).Methods:A total of 80 patients with acute myocardial infarction treated in Beijing Anzhen Hospital of Capital Medical University were selected and divided into control group and observation group according to the random number table method,with 40 cases in each group.The control group was given Qirong Runchang oral liquid while the observation group was given Biantong capsule for 4 week.The incidence of constipation,the constipation symptom scores,the postoperative defecation time for the first time,the length of hospital stay,the biggest addition of myocardial oxygen consumption and the adverse reactions were observed and compared.Results:The incidence of constipation and constipation symptom scores in the observation group were lower than that of the control group,and it was statistically significant (P<0.05).And the first time of postoperative defecation and hospitalization time in the observation group were lower than the control group,and the difference was statistically significant (P<0.05).The maximum myocardial oxygen consumption of the observation group was significantly lower than that of the control group,and the difference was statistically significant (P<0.05).There was no significant difference in the incidence of cardiovascular events and adverse drug reactions between the 2 groups (P>0.05).Conclusion:Biantong Capsule has effective clinical efficacy on patients with constipation after PTCA in acute myocardial infarction.It can reduce the maximum myocardial oxygen consumption during defecation and the incidence of cardiovascular events,which is safe and worthy of expanding the sample size for further observation.