Acute effect of multipoint pacing and fused AV delay in patients receiving cardiac resynchronization therapy

FIGURE 1. Delta dp/dt and delta QRS duration in each pacing configuration. (A) Delta dp/dt between conventional cardiac resynchronization therapy (c‐CRT) and multipoint pacing (MPP), (B) Delta QRS duration between c‐CRT and MPP, (C) Delta dp/dt between short AV delay and fused AV delay, (D) Delta QRS duration between short AV delay and fused AV delay, (E) Delta dp/dt among four categories, (F) Delta QRS duration among four categories.

FIGURE 2. Delta dp/dt and delta QRS duration in each pacing configuration in patients with LBBB or non‐LBBB. (A) Delta dp/dt between conventional cardiac resynchronization therapy (c‐CRT) and multipoint pacing (MPP), (B) Delta QRS duration between c‐CRT and MPP, (C) Delta dp/dt between short AV delay and fused AV delay, (D) Delta QRS duration between short AV delay and fused AV delay.

FIGURE 3. Delta dp/dt and delta QRS duration between biventricular pacing and LV pacing with fused AV delay. (A) Delta dp/dt between biventricular (BiV) and LV pacing with fused AV delay and multipoint pacing (MPP). (B) Delta QRS duration between BiV and LV pacing with fused AV delay and MPP.

FIGURE 4. Correlation between delta dp/dt and delta QRS duration. The correlation coefficient between delta QRS duration and delta dp/dt was inversely correlated with biventricular and LV pacing.

FIGURE 5. Responder rate after CRT implantation. The response rate after 6 months in patients with pacing site optimization using the mounted auto‐fusion AV delay function in the device was evaluated by left ventricular end‐systolic volume (LVESV) change on ultrasound cardiography. The results showed that 66% of super‐responders and 15% of responders, making a total of 81%, had a good response.