Predictors of Initial Revascularization Versus Medical Therapy Alone in Patients With Non-ST-Segment-Elevation Acute Coronary Syndrome Undergoing an Invasive Strategy

Harindra C Wijeysundera; Mandeep S Sidhu; Maria C Bennell; Feng Qiu; Dennis T Ko; Merril L Knudtson; Jack V Tu; William E Boden

doi:10.1161/CIRCINTERVENTIONS.115.003592

Predictors of Initial Revascularization Versus Medical Therapy Alone in Patients With Non-ST-Segment-Elevation Acute Coronary Syndrome Undergoing an Invasive Strategy

Circ Cardiovasc Interv. 2016 Jul;9(7):e003592. doi: 10.1161/CIRCINTERVENTIONS.115.003592.

Authors

Harindra C Wijeysundera¹, Mandeep S Sidhu², Maria C Bennell², Feng Qiu², Dennis T Ko², Merril L Knudtson², Jack V Tu², William E Boden²

Affiliations

¹ From the Schulich Heart Centre, Division of Cardiology, Sunnybrook Health Sciences Centre (H.C.W., M.C.B., D.T.K., J.V.T.) and Institute of Health Policy, Management and Evaluation (H.C.W., D.T.K., J.V.T.), University of Toronto, Ontario, Canada; Institute for Clinical Evaluative Sciences, Ontario, Canada (H.C.W., F.Q., D.T.K., J.V.T.); Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada (H.C.W.); Samuel S. Stratton VA Medical Center, Albany Medical Center, Albany Medical College, New York (M.S.S., W.E.B.); and Foothills Hospital, University of Calgary, Alberta, Canada (M.L.K.). harindra.wijeysundera@sunnybrook.ca.
² From the Schulich Heart Centre, Division of Cardiology, Sunnybrook Health Sciences Centre (H.C.W., M.C.B., D.T.K., J.V.T.) and Institute of Health Policy, Management and Evaluation (H.C.W., D.T.K., J.V.T.), University of Toronto, Ontario, Canada; Institute for Clinical Evaluative Sciences, Ontario, Canada (H.C.W., F.Q., D.T.K., J.V.T.); Li Ka Shing Knowledge Institute of St. Michael's Hospital, Toronto, Ontario, Canada (H.C.W.); Samuel S. Stratton VA Medical Center, Albany Medical Center, Albany Medical College, New York (M.S.S., W.E.B.); and Foothills Hospital, University of Calgary, Alberta, Canada (M.L.K.).

PMID: 27418612
DOI: 10.1161/CIRCINTERVENTIONS.115.003592

Abstract

Background: Although an invasive strategy is a class I clinical practice guideline for non-ST-segment-elevation acute coronary syndromes, there is wide variation in the proportion of patients who undergo revascularization despite early angiography. We sought to identify the predictors of early revascularization versus medical therapy alone in patients with non-ST-segment-elevation acute coronary syndrome undergoing an invasive strategy and to assess their clinical outcomes.

Methods and results: We assessed revascularization status by percutaneous coronary intervention or coronary artery bypass grafting within 7 days of the index angiogram in all patients with non-ST-segment-elevation acute coronary syndrome who underwent an invasive strategy in Ontario, Canada, from October 1, 2008, to October 31, 2013, with follow-up through December 31, 2014. The primary outcome was mortality. Multivariable hierarchical logistic models identified predictors of revascularization, and multivariable Cox models with treatment strategy as a 3-level time-varying covariate assessed the relationship between revascularization status and clinical outcomes. We identified 50 302 patients of whom 34 288 (68.2%) underwent revascularization (percutaneous coronary intervention: 28 011 and coronary artery bypass grafting: 6277). There was a 2-fold variation in revascularization rates across hospitals. A higher risk presentation significantly predicted revascularization (odds ratio, 1.26; 95% confidence interval, 1.18-1.35), as did having the angiogram by an interventional cardiologist (odds ratio, 1.76; 95% confidence interval, 1.57-1.98). Revascularized patients with either percutaneous coronary intervention (hazard ratio, 0.64; 95% confidence interval, 0.60-0.69) or coronary artery bypass grafting (hazard ratio, 0.53; 95% confidence interval, 0.47-0.60) had improved survival compared with medically treated patients.

Conclusions: Although the majority of patients with non-ST-segment-elevation acute coronary syndrome who underwent an early invasive approach received revascularization, there was wide variation. Revascularization was associated with significantly improved survival.

Keywords: acute coronary syndrome; angiography; cardiovascular disease; coronary angiography; hospitalization.

Publication types

Comparative Study
Observational Study
Research Support, Non-U.S. Gov't

MeSH terms

Acute Coronary Syndrome / diagnostic imaging
Acute Coronary Syndrome / mortality
Acute Coronary Syndrome / therapy*
Aged
Cardiovascular Agents / adverse effects
Cardiovascular Agents / therapeutic use*
Coronary Artery Bypass* / adverse effects
Coronary Artery Bypass* / mortality
Female
Humans
Kaplan-Meier Estimate
Logistic Models
Male
Middle Aged
Multivariate Analysis
Non-ST Elevated Myocardial Infarction / diagnostic imaging
Non-ST Elevated Myocardial Infarction / mortality
Non-ST Elevated Myocardial Infarction / therapy*
Odds Ratio
Ontario
Percutaneous Coronary Intervention* / adverse effects
Percutaneous Coronary Intervention* / mortality
Proportional Hazards Models
Risk Factors
Time Factors
Treatment Outcome

Substances

Cardiovascular Agents

Grants and funding

CIHR/Canada