Variation in coronary revascularization practices explored in CMAJ paper
A study led by Dr. Jack Tu, for the Cardiac Care Network (CCN) of Ontario’s Variations in Revascularization Practice in Ontario (VRPO) Working Group explores what drives the variation observed in the ratio of percutaneous coronary interventions to coronary artery bypass graft surgeries (PCI:CABG ratio) across Ontario hospitals. The study also involved several other CCORT investigators--see reference below.
This retrospective cohort study involved a population-based sample of 8,972 patients who underwent an index cardiac catheterization between April 2006 and March 2007 at any of Ontario’s 17 cardiac centres. The study's objective was to identify clinical and nonclinical factors associated with the considerable degree of variation observed in the ratio across centres.
The study revealed a threefold variation in the ratios across the four hospital ratio groups (low [< 2.0], low–medium [2.0–2.7], medium–high [2.8–3.2] and high [> 3.2]). The overall mean PCI:CABG ratio was 2.7. However, ratios ranged from a mean of 1.6 in the lowest ratio group to a mean of 4.6 in the highest ratio group. Most of the variation in ratios was driven by the variation in how patients with non-emergent multivessel disease were managed.
The strongest independent predictors of the mode of revascularization were i) the physician performing the diagnostic catheterization; and ii) the treating hospital. These findings, as discussed in the accompanying commentary, indicate that the transparency and consistency of the decision making process for revascularization can be improved. For further details please see the article here. The commentary is available here.
Tu JV, Ko DT, Guo H, Richards JA, Walton N, Natarajan MK, Wijeysundera HC, So D, Latter DA, Feindel CM, Kingsbury K, Cohen EA, for the Cardiac Care Network of Ontario’s Variations in Revascularization Practice in Ontario Working Group. Determinants of variations in coronary revascularization Practices. CMAJ. December 12, 2011.