Abstract: Objective To explore the effect of a new cardiac rehabilitation model on cardiac systolic function in the elderly patients with acute myocardial infarction (AMI) after percutaneous coronary intervention (PCI). Methods A prospective research was carried out, and 160 elderly patients with AMI receiving PCI admitted to our hospital from May 2017 to May 2019 were enrolled.The patients were divided into observation group and control group by random number table, with 80 cases in each group.The control group received routine rehabilitation training, while the observation group received new cardiac rehabilitation training. The changes of cardiac function in the two groups were measured before intervention and 3 months after intervention, including left atrial diameter (LAD), left ventricular ejection fraction (LVEF), left ventricular end-diastolic diameter (LVEDD), left ventricular end-systolic volume (LVESV), wall motion score index (WMSI), and left ventricular end-diastolic volume (LVEDV).The symptoms of angina pectoris was evaluated by Seattle Angina Questionnaire (SAQ) before and after intervention, and the adverse events were recorded in both groups. Results After intervention, the level of LVEF of the two groups was higher and the levels of LVESV, WMSI and LVEDV were lower than those before intervention(P<0.05), especially in the observation group (P<0.05).After intervention, the frequency of angina attack, the degree of angina stability, the satisfaction of treatment, the limitation of physical activity and the score of disease recognition in the two groups were higher than those before intervention, especially in the observation group (P<0.05 or P＜0.01).There was no difference in the incidence rate of heart failure, shock, arrhythmia and mortality between the two groups (P>0.05). Conclusions The new cardiac rehabilitation model can promote the improvement of cardiac function in the elderly patients with AMI and further alleviate the symptoms of angina pectoris, which is worthy of popularization and application.

Key words: acute myocardial infarction, percutaneous coronary intervention, new heart rehabilitation model, cardiac systolic function