Delay optimization of multipoint pacing increases the cardiac index and narrows the QRS width.

Introduction: The benefits of MPP delay optimization on hemodynamics and ventricular contraction synchronicity can be quantified with cardiac index (CI) and QRS width. A delay with the maximum CI and minimum QRS width may be the optimized settings for multipoint pacing (MPP).

Methods: Twelve patients with advanced heart failure who received cardiac resynchronization therapy defibrillation with MPP at the Third People's Hospital of Chengdu from March 2016 to April 2019 were included.

[Safety and efficiency of pacing at right ventricular outflow versus at ventricular cardiac apex].

Objective: To compare the safety and efficiency of pacing at right ventricular outflow versus right ventricular apex.

Method: Patients were divided into two groups: pacing at ventricular cardiac apex (common pacing group, n = 22) and pacing at right ventricular outflow tract (uncommon pacing group, n = 18).

Results: Impedance and amplitude of R-wave were similar during implantation between the two groups (all P > 0.