Outcomes after coronary artery bypass grafting and percutaneous coronary intervention in diabetic and non-diabetic patients

AIMS: To assess the prognosis of patients with coronary heart disease (CHD) after first myocardial revascularisation procedure in real-world practice and to compare the differences in outcomes of coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI) among diabetic and non-diabetic patients. METHODS AND RESULTS: A database was compiled from the national hospital discharge register to collect data on all cardiac revascularisations performed in Finland in 2000–2015. The outcomes (all-cause deaths, cardiovascular (CV) deaths, major CV events and need for repeat revascularisation) after the first revascularisation were identified from the national registers at 28 day, 1 year, and 3 year time points. A total of 139 242 first-time revascularisations (89 493 PCI and 49 749 CABG) were performed during the study period. Of all the revascularised patients, 24% had diabetes, and 76% were non-diabetic patients. At day 28, the risk of fatal outcomes was lower after PCI than after CABG among non-diabetic patients, whereas no difference was seen among diabetic patients. In long-term follow-up the situation was reversed with PCI showing higher risk compared with CABG for most of the outcomes. In particular, at 3 year follow-up the risk of all-cause deaths was elevated among diabetic patients [HR 1.30 (95% CI 1.22–1.38) comparing PCI with CABG] more than among non-diabetic patients [HR 1.09 (1.04–1.15)]. The same was true for CV deaths [HR 1.29 (1.20–1.38) among diabetic patients, and HR 1.03 (0.98–1.08) among non-diabetic patients]. CONCLUSION: Although PCI was associated with better 28 day prognosis, CABG seemed to produce better long-term prognosis especially among diabetic patients.