2.3 Observation indicators
(1) The hospital anxiety and depression scale (HAD) [8] was used to evaluate the negative emotions of the two groups of patients before and after intervention. D stood for depression and A stood for anxiety using the grade 5 scoring method (according to 4, 3, 2, 1, 0), 0~7 means there is no anxiety or depression, 8~10 means at the edge of anxiety or depression, and 11~20 means at the symptoms of anxiety or depression.(2) after the nursing intervention, Self-management behavior scale (CSMS) [9] was used to evaluate way of life and self-management behavior in both groups, the scale including 27 items namely, symptom management (4 items), emergency management (3 items), bad habits (4 items), emotion management (4 items), disease, knowledge management (5 items), life management (4 items), treatment compliance management (3 items). Level 5 scoring was used (4, 3, 2, 1, 0). The higher score means better self-management behavior. (3) Philips IE33 ultrasound was used to evaluate the cardiac function of the patients 30 days after the operation. Left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV) and left ventricular ejection fraction (LVEF) were recorded respectively. (4) In 6 months after the cardiovascular, patients life quality evaluation questionnaire (CQQC) [10] was used to assess the patient’s quality of rehabilitation, the scale contains 24 items in six dimensions, including physical strength (2 items), illness (6 items), medical conditions (2 items), general life (5 items), social psychology (7 items), working conditions (2 items), total score is 154 points. The higher score indicates that the better quality of rehabilitation.(5) The incidence of adverse cardiovascular events (MACE) was observed in the two groups within 6 months after surgery, MACE mainly included non-fatal recurrent AMI, cardiogenic shock, arrhythmia, heart failure, etc. On the day of the patient’s discharge from the hospital, the self-made satisfaction questionnaire was used to evaluate the patient’s satisfaction with the nursing work. The total score of the scale was 100 points, among which > 80 was satisfaction, 60 to 80 was general satisfaction and < 60 was dissatisfaction. Total satisfaction rate = (satisfaction + general satisfaction)/total number of cases ×100%.