Figure 4.

(A) Effect of map directed pacing on cardiac output at fixed optimal atrioventicular delay. Increases in cardiac output with endocardial pacing in regions of normal activation in patients where the left ventricular epicardial leads were located in regions of slow conduction (*p < 0.05 v DDDRV mode). “Rove” refers to the locator catheter pacing outside these regions of slow conduction. (B) Percentage change in dP/dt_maxv DDDRV pacing (†p < 0.01 v DDDRV mode). DDDRV, right ventricular pacing in DDD mode.