In-Hospital and One-Year Clinical Outcome of Percutaneous Coronary Intervention in a Tertiary Hospital in Oman: Oman PCI Registry

Abstract

Objectives: The aim of the study was to investigate the in-hospital and one-year clinical outcome of patients treated with percutaneous coronary intervention (PCI) in a tertiary hospital in Oman.

Methods: We conducted a retrospective, single-center, observational study looking at patients > 18 years old who underwent a PCI from 1 January to 31 December 2013. The primary end point was the occurrence of a major adverse cardiovascular event (MACE), defined as death, any myocardial infarction (MI), cerebrovascular accident (CVA), and target vessel revascularization (TVR) with either repeat PCI or coronary artery bypass surgery (CABG). Secondary end-points included procedural success rate, angina status, stent thrombosis, and the rate of redo-PCI/CABG for in-stent restenosis.

Results: A total of 1 045 consecutive patients were analyzed. The mean age of the cohort was 58.2±11.2 years. Hyperlipidemia (66.8%), hypertension (55.1%), and diabetes mellitus (45.9%) were the predominant risk factors. Stable angina, ST-elevation MI, non-ST-elevation MI, and post-acute coronary syndrome (ACS) were common indications (approximately 20.0% each). The angiographic and procedural success rate was 95.0%. Forty-six percent of patients had single-vessel disease, 34.4% had double vessel disease, and triple vessel disease was seen in 19.1% of patients. Ninety-eight percent had balloon angioplasty with stenting, and only 1.9% of patients had balloon angioplasty without stenting. The majority of patients had single-vessel stenting (81.3%). A drug-eluting stent was used in 88.4% of patients, and a bare-metal stent in 11.6%. In-hospital MACE was 3.6%. There were 19 in-hospital deaths (1.8%), and four patients (0.4%) had CVA/MI. Out of 1 026 patients discharged, 100 patients were lost to follow-up. Among the 926 patients followed-up, 673 patients (72.7%) were asymptomatic. One-year MACE was 17.0%, including 5.0% death and 6.0% MI. Repeat revascularization was performed in 53 patients (5.7%) for documented in-stent restenosis. Definite stent thrombosis was documented in 10 (1.1%) patients. At discharge, the majority of patients were on post-ACS evidence-based medications, aspirin (100%), clopidogrel (99.6%), statin (97.6%), beta-blocker (88.7%), and angiotensin-converting-enzyme inhibitors (83.9%).

Conclusions: Omani patients treated with PCI were much younger than Western patients with a high prevalence of risk factors. Successful PCI was achieved in a large percentage of patients with a low incidence of in-hospital complications and mortality. At one-year follow-up, the majority patients had a good clinical outcome.

Keywords: Myocardial Infarction; Percutaneous Coronary Intervention; Stents.