Analysis of the survival of patients with cardiac conditions after angioplasty operation and factors affecting it

Cardiovascular conditions have been known to be the most important causes of mortality and disability in most countries. Official statistics show that mortality rate from such a phenomenon is on the rise in Iran. The present study was aimed to measure survival rate and factors affecting it in patients with heart conditions after angioplasty operation. This study focused on medical histories of 1188 patients who experienced angioplasty operation in Imam Ali medical-educational cardiovascular-condition-based institute in Kermanshah, from 2006 to 2013. Patients were monitored till the end of 2013 in order to incorporate main conditions (death, myocardial infarction, and brain stroke). In order to analyze the survival of these patients, non-parametric method (Kaplan Meier) and semiparametric method (Cox regression) were used. All calculations were done using STATA software – version 12 – and significance of 0.05 was obtained. In this study, from the 1188 patients who received angioplasty surgery, 819 patients were male and 369 patients were female. 98 patients had major clinical conditions (MACE), 6 patients died, one patient had a brain stroke, and 91 patents had myocardial infarction. Using Kaplan Meier method, one, three, five, and seven-year survival levels of patients after angioplasty operation were calculated to be 99/8, 97, 91/8, 69/7, respectively. In addition, average survival period was 82.253 ± 1.283 months, and mean survival period was 82.5 months. Factors influencing survival period, based on Cox regression model are: dyslipidemia, angioplasty history, and number of embedded stents. Over time, the likelihood of vascular blockage rises in patients with angioplasty, and their survival period decreases after 52 months. Additionally, hazard rate for these patients is very high after the 52 months.