Effect of Enhanced External Counterpulsation

Inclusion Criteria: * patients with AMI diagnosed based on the universal definition of myocardial infarction criteria * a single vessel infarcted, and Syntax score ≤22 * patients treated using DCB * patients without EECP contraindications * patients aged 18-75 years * patients who had signed informed consent and were able to cooperate in completing the study Exclusion Criteria: * patients with lower limb deep venous thrombosis and active thrombophlebitis * patients with moderate to severe valvular heart disease, especially those with aortic insufficiency and/or stenosis * patients with moderate to severe pulmonary arterial hypertension (mean pulmonary arterial pressure \>50 mmHg) * patients with aortic, cerebral or dissecting aneurysms * patients with uncontrolled hypertension (\>180/110 mmHg) * patients with decompensated heart failure (cardiac function of grade IV) * patients with arrhythmia that might interfere with the electrocardiographic gating function of the EECP device * patients with haemorrhagic diseases or obvious bleeding tendencies * patients with infected lesions in their limbs that may affect EECP * pregnant women * patients with ventricular aneurysm and mural thrombus detected through echocardiography