Long-term Reverse Remodeling and Clinical Improvement by MultiPoint
Pacing in a Randomized, International, Middle Eastern Heart Failure
Study
Abstract
Introduction: Cardiac resynchronization therapy (CRT) with multipoint
left ventricular (LV) pacing (MultiPoint™ Pacing, MPP) has been shown to
improve CRT response, although MPP response using automated pacing
vector programming has not been demonstrated in the Middle East.
Objective: Compare the impact of MPP to conventional biventricular
pacing (BiV) using echocardiographic and clinical changes at 6 months
post-implant. Methods: This prospective, randomized study was conducted
at 13 Middle Eastern centers. After de novo CRT-D implant (Abbott Unify
Quadra MP™ or Quadra Assura MP™) with quadripolar LV lead (Abbott
Quartet™), patients were randomized to either BiV or MPP therapy. In BiV
patients, the LV pacing vector was selected per standard practice; in
MPP patients, the two LV pacing vectors were selected automatically
using VectSelect. CRT response was defined at 6 months post-implant by a
reduction in LV end-systolic volume (ESV) ≥15%. Results: One-hundred
and forty-two patients (61 years old, 68% male, NYHA class II/III/IV
19%/75%/6%, 33% ischemic, 57% hypertension, 52% diabetes, 158 ms
QRS, 25.8% ejection fraction [EF]) were randomized to either BiV
(N=69) or MPP (N=73). After 6 months, MPP vs. BiV patients experienced
greater ESV reduction (25.0% vs. 15.3%, P=0.08), greater EF elevation
(11.9% vs. 8.6%, P=0.36), significantly greater ESV response rate
(68.5% vs. 50.7%, P=0.04), and significantly greater NYHA class
improvement rate (80.8% vs. 60.3%, P=0.01). Conclusions: With MPP and
automatic LV vector selection, more CRT patients in the Middle East
experienced reverse remodeling and clinical improvement relative to
conventional BiV pacing.