Electrically vs. imaging-guided left ventricular lead placement in cardiac resynchronization therapy: a randomized...

Area of Science:

• Cardiology
• Medical Devices
• Electrophysiology

Background:

• Cardiac resynchronization therapy (CRT) improves outcomes in heart failure patients.
• Optimal left ventricular (LV) lead placement is crucial for CRT efficacy.
• Current lead placement strategies may not consistently target the latest activated myocardium.

Purpose of the Study:

• To compare electrically guided LV lead placement with imaging-guided placement in CRT recipients.
• To assess the impact on left ventricular ejection fraction (LVEF) increase.
• To evaluate secondary clinical outcomes and device-related complications.

Main Methods:

• A double-blinded, randomized trial involving 122 patients with ischaemic heart disease.
• Intervention group: electrically guided LV lead placement and VVd optimization.
• Control group: imaging-guided LV lead placement (CT venography, Rubidium imaging, speckle tracking echocardiography).

Main Results:

• The intervention group showed a numerically larger increase in LVEF (11% vs. 7%), though not statistically significant after adjustment (P=0.09).
• No significant differences were observed in clinical response, LV reverse remodelling, or complication rates between groups.
• The primary endpoint of absolute LVEF increase did not reach statistical significance in the adjusted analysis.

Conclusions:

• Electrically guided CRT implantation is non-inferior to imaging-guided strategies regarding LVEF change, LV reverse remodelling, and clinical response.
• Larger, long-term studies are needed to confirm the benefits of an electrically guided CRT approach.
• Further research should explore the long-term efficacy and impact of electrical mapping in CRT.