Figure 4.

Interrelationship between left ventricular end-systolic volume (LVESV) change or composite cardiac resynchronization therapy benefit index and intrinsic (A,B), right ventricular (RV)-paced (C,D), and left ventricular (LV)-paced (E,F) electrical delays. Correlation parameters (R², P value) and the formula of the regression line are indicated. For intrinsic delay, regression was determined using absolute values of the conduction time, which converted negative values (sensing at LV1 occurring earlier than at RV) to positive values. The regression lines in the plots are therefore kinked at 0 ms. p = paced; s = sensed.