Related Experiment Video
Updated: May 14, 2026
Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
Association between QRS duration and outcome with cardiac resynchronization therapy: a systematic review and
Adam R Bryant1, Stephen B Wilton, Michael P Lai
1Libin Cardiovascular Institute of Alberta, University of Calgary, Canada.
Purpose:
We conducted a systematic review and meta-analysis of randomized and observational studies to evaluate the associations between QRS duration (QRSd) at baseline or in follow-up and outcomes with cardiac resynchronization therapy (CRT).
Methods:
We searched online databases to December 2010 and included 6 randomized controlled trials (RCTs) and 38 observational studies. Outcomes included clinical/functional response, left ventricular (LV) remodeling, hospitalizations and mortality.
Results:
In RCTs, a benefit of CRT was evident only in patients with QRSd >150ms. In observational studies, those meeting either clinical or remodeling CRT response definitions had both wider pooled baseline QRSd and significantly more QRS narrowing with CRT than non-responders.
Conclusions:
RCTs demonstrate that benefit with CRT appears restricted to those with baseline QRSd wider than 150ms. Both wider baseline QRS and more QRS narrowing are associated with CRT response in observational studies. Electrocardiographic QRSd plays an important role in CRT patient selection and follow-up.
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