Six-minute walk distance after coronary artery bypass grafting compared with medical therapy in ischaemic cardiomyopathy.
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In patients with ischaemic left ventricular dysfunction, coronary artery bypass surgery (CABG) may decrease mortality, but it is not known whether CABG improves functional capacity.To determine whether CABG compared with medical therapy alone (MED) increases 6 min walk distance in patients with ischaemic left ventricular dysfunction and coronary artery disease amenable to revascularisation.The Surgical Treatment in Ischemic Heart disease trial randomised 1212 patients with ischaemic left ventricular dysfunction to CABG or MED. A 6 min walk distance test was performed both at baseline and at least one follow-up assessment at 4, 12, 24 and/or 36 months in 409 patients randomised to CABG and 466 to MED. Change in 6 min walk distance between baseline and follow-up were compared by treatment allocation.6 min walk distance at baseline for CABG was mean 340±117 m and for MED 339±118 m. Change in walk distance from baseline was similar for CABG and MED groups at 4 months (mean +38 vs +28 m), 12 months (+47 vs +36 m), 24 months (+31 vs +34 m) and 36 months (-7 vs +7 m), P>0.10 for all. Change in walk distance between CABG and MED groups over all assessments was also similar after adjusting for covariates and imputation for missing values (+8 m, 95% CI -7 to 23 m, P=0.29). Results were consistent for subgroups defined by angina, New York Heart Association class ≥3, left ventricular ejection fraction, baseline walk distance and geographic region.In patients with ischaemic left ventricular dysfunction CABG compared with MED alone is known to reduce mortality but is unlikely to result in a clinically significant improvement in functional capacity.NCT00023595.
coronary artery bypass grafting
six-minute walk distance
Published Version (Please cite this version)10.1136/openhrt-2017-000752
Publication InfoAl-Khalidi, Hussein; Cleland, John GH; Desvigne-Nickens, Patrice; Drazner, Mark H; Jasinski, Marek; Kosevic, Dragana; ... White, Harvey D (2018). Six-minute walk distance after coronary artery bypass grafting compared with medical therapy in ischaemic cardiomyopathy. Open heart, 5(1). 10.1136/openhrt-2017-000752. Retrieved from https://hdl.handle.net/10161/16485.
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Associate Professor of Biostatistics and Bioinformatics
My research interest includes design and analysis of cardiovascular clinical trials, medical devices, survival analysis, group-sequential analysis, time-to-recurrent or multiple events, continuous-time Markov models, stochastic process, linear model, dose-response modeling, design of experiments and adaptive designs.
Adjunct Professor in the Department of Medicine
LeadershipEric J. Velazquez, MD, is a Professor of Medicine with tenure at Duke University. As section chief for Cardiovascular Imaging in the Division of Cardiology and director of the Cardiac Diagnostic Unit and Echocardiography Laboratories for Duke University Health System, he coordinates a high-volume enterprise and an outstanding group of clinician-investigators and clinical staff who make important contributions across patient care, research and educational
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