2.1 Research objects
This study is a retrospective study, selected patients with coronary heart disease who underwent PCI in the National Key Specialty Cardiology Department of a tertiary and first-class hospital in Zhenjiang from January 2015 to November 2015 as the research subjects. Inclusion criteria: (1) Meet the diagnostic criteria of coronary heart disease [5]; (2) Successfully received PCI (surgical success criteria: residual vascular stenosis after PCI is less than 20%, TIMI blood flow > grade II) [6]. Exclusion criteria: (1) patients with severe hepatic and renal insufficiency; (2) patients with tumor and cachexia; (3) patients with a history of revascularization; (4) patients who were readmitted for treatment due to the fractional PCI strategy. Sample size calculation: In Logistic regression analysis, the recommended sample size is 10–15 times the number of variables. A total of 18 observation variables were included in this study, and 10% of the invalid questionnaires were considered, so the sample estimated size was 198–297. A total of 301 patients were included in this study.
2.2Data Collection
A retrospective analysis method was used to collect the gender, age, activities of daily living, white blood cell count, platelet count, blood urea, D-dimer, fibrinogen, creatine kinase,lactate dehydrogenase, myoglobin, troponinI,brain natriuretic peptide,coronary heart disease specific index, Killip cardiac function class, left ventricular ejection fraction, hyperlipidemia, multivessel disease.Among them, daily life behaviors mainly include ① dinner satiety: eat dinner every day until you feel full;②Smoking: more than 10 cigarettes per day;③ Heavy drinking: At least 3 times a week, the amount of drinking (white wine) is more than 250g or the daily drinking amount (white wine) is more than 750g;④ Fitness: The amount of exercise has not reached at least 3 days a week, at least 1 hour each time [7].Patients who have any one or more of the above bad behaviors are identified as poor behaviors in daily life. The coronary heart disease specific index is a model specially used to evaluate the comorbidities of patients with coronary heart disease. Its risk factors include smoking 1 point, hypertension 1 point, stroke/TIA history 1 point, diabetes 2 points, diabetic complications 3 points, Chronic obstructive pulmonary disease 2 points, peripheral vascular disease 2 points, tumor/lymphoma/leukemia 2 points, moderate to severe renal insufficiency 7 points,metastatic cancer 5 points, with a total score of 26 points, ≥ 4 points are considered high-risk patients [8]. The reasons for readmission, coronary angiography, PCI data, and stent placement were recorded, and the subjects were divided into revascularization group and non-revascularization group according to whether PCI was performed or not.
The data used to support the findings of this study are available from the corresponding author upon request.We would like to acknowledge and are grateful to Dr. Songmei Cao for providing additional data from their studies. We would also like to acknowledge the Jiangsu University Library for facilitating this work.All research methods used in this study were conducted in accordance with relevant guidelines and regulations.All protocols in this study were approved by the Ethics Committee of the Affiliated Hospital of Jiangsu University with the informed consent of all subjects.
2.3Statistical methods
Statistical analysis was performed using SPSS19.0 software. Enumeration data are expressed as percentages. Univariate analysis was performed using the chi-square test or the exact probability method. The variables with statistical significance in univariate analysis were used as independent variables, and whether revascularization was repeated as the dependent variable, multivariate Logistic regression analysis was performed. The Nomo graph model was established by using R software. Plot ROC curves to internally validate model prediction performance. P < 0.05 was considered to be statistically significant.