Key result
Image-guided left ventricular lead implantation in cardiac resynchronization therapy did not show superiority over conventional implantation approaches in the majority of randomized controlled trials.
Why the study?
Most randomized controlled trials evaluating image-guided LV lead implantation have unexpectedly failed to demonstrate superiority over conventional approaches in CRT.
Does image-guided left ventricular lead implantation improve outcomes compared to conventional implantation in patients undergoing CRT?
Does image-guided left ventricular lead implantation improve outcomes compared to conventional implantation in patients undergoing CRT?
Despite theoretical benefits, image-guided LV lead placement in CRT has not shown superiority over conventional methods in most RCTs, likely due to anatomical limitations and patient selection factors.
Most RCTs show no superiority of image-guided LV lead placement; challenges routine adoption of image guidance in CRT.
The present article reviews the literature on image-guided cardiac resynchronization therapy (CRT) studies. Improved outcome to CRT has been associated with the placement of a left ventricular (LV) lead in the latest activated segment free from scar. The majority of randomized controlled trials investigating guided LV lead implantation did not show superiority over conventional implantation approaches. Several factors may contribute to this paradoxical observation, including inclusion criteria favoring patients with left bundle branch block who already respond well to conventional anatomical LV lead implantation, differences in activation wavefronts during simultaneous right ventricular and LV pacing, incorrect definition of target regions, and limitations in coronary venous anatomy that prevent access to target regions that are detected by imaging. It is imperative that exclusion of patients lacking access to target regions from these studies would lead to larger benefit of image-guided CRT.
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Nguyên et al. (2023) conducted a review in Cardiac resynchronization therapy. Image-guided left ventricular lead implantation vs. Conventional anatomical LV lead implantation was evaluated. Image-guided left ventricular lead implantation in cardiac resynchronization therapy did not show superiority over conventional implantation approaches in the majority of randomized controlled trials.
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