Abstract 122: Characteristics of Patients with Multivessel Coronary Disease Treated with Percutaneous Intervention Versus Bypass Surgery and Preliminary Mortality Outcomes: A Province-wide Field Evaluation

Introduction: Wide variation in choice of revascularization treatment for patients with multivessel coronary disease has been observed and outcomes of percutaneous coronary intervention (PCI) versus coronary artery bypass surgery (CABG) are increasingly examined. Our publicly funded cardiology evaluation unit was mandated by the Quebec Ministry of Health to evaluate the practice of multivessel revascularization and its outcomes across Quebec’s 8 tertiary cardiac centers offering both PCI and CABG. Methods: Hospital records were used to identify all multivessel (≥2 myocardial territories) interventions by PCI and isolated CABG in each center in 2010-12. Primary PCI patients were excluded. A maximum of 300 patients treated with CABG and 300 patients treated with PCI in each center were randomly selected for chart review by our evaluation unit. Results: The study cohort included 2018 PCI patients and 2274 isolated CABG patients. Median age was 66 years for both PCI (interquartile range, IQR: 59-76) and CABG (IQR: 59-72) and prevalence of most risk factors and comorbidities was very similar. However, compared to CABG patients, there were more females in the PCI group (27% vs 17%), more cardiogenic shock (2.2% vs 0.6%), more patients with previous PCI (27% vs 16%) and previous valve surgery (1.2% vs 0.1%), and more patients with interventions in only 2 myocardial territories (89% vs 31%). The PCI group was more likely than the CABG group to have acute myocardial infarction (AMI) (32% vs 18%) but less likely to have heart failure on admission (9% vs 18%). Almost 1 in 5 (19%) PCI patients were treated for left main disease. Diabetes was present in 29% of PCI patients vs 37% of CABG patients. Compared to CABG, PCI patients had a shorter median delay between admission and intervention (0 vs 2 days) as well as between intervention and discharge (1 vs 6 days) and were more likely to be transferred out to another hospital (37% vs 14%). However, mortality before discharge or transfer from tertiary cardiac centers was higher for PCI than CABG patients both with AMI (3.1% vs 0.7%) and without AMI (1.0% vs 0.5%). The differences of all reported comparisons were statistically significant (p< 0.001) except for in-hospital mortality without AMI (p=0.25). Conclusions: Patients with multivessel disease who were treated with PCI were more likely to present with acute symptoms, have more cardiogenic shock and more previous valve surgery but have less extensive coronary disease, less diabetes and less heart failure. Age and other risk factors and comorbidities were very similar in the 2 groups. Crude mortality during the index surgical hospital admission was higher for PCI despite a shorter length of stay. To gain more insight into these results, it will be important to link to medico-administrative data to examine 30-day and 1-year mortality and to adjust appropriately for potential confounders.

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