Targeted left ventricular lead placement to guide cardiac resynchronization therapy: the TARGET study: a randomized,...

Area of Science:

• Cardiology
• Medical Imaging
• Electrophysiology

Background:

• Optimal cardiac resynchronization therapy (CRT) response depends on left ventricular (LV) lead placement at the latest contracting site, avoiding scar tissue.
• A randomized controlled trial was designed to compare a novel targeted LV lead placement strategy against standard CRT care.

Purpose of the Study:

• To evaluate the impact of a targeted approach to left ventricular (LV) lead placement on patient outcomes following cardiac resynchronization therapy (CRT).
• To determine if guided LV lead positioning improves CRT efficacy compared to conventional methods.

Main Methods:

• 220 patients undergoing CRT were randomized into two groups: TARGET (guided LV lead placement) and control (standard unguided CRT).
• The TARGET group's LV lead was positioned using speckle-tracking echocardiography at the latest peak contraction site (>10% amplitude) to ensure scar-free placement.
• Primary endpoint was a ≥15% reduction in LV end-systolic volume at 6 months; secondary endpoints included clinical response, mortality, and heart failure hospitalizations.

Main Results:

• The TARGET group showed a significantly higher response rate (70% vs. 55%, p=0.031) for the primary endpoint.
• TARGET patients experienced improved clinical response (83% vs. 65%, p=0.003) and a lower rate of combined mortality and heart failure hospitalization (p=0.031) compared to controls.
• LV lead placement concordant with the optimal site was more frequent in the TARGET group.

Conclusions:

• Utilizing speckle-tracking echocardiography for targeted LV lead placement in CRT significantly enhances treatment response and clinical outcomes.
• This strategy leads to improved patient status and reduced combined risks of death and heart failure hospitalization compared to standard CRT.
• The TARGET study demonstrates the clinical utility of image-guided lead placement for optimizing CRT.