Click on image to view larger version.

Figure 3 Acute hemodynamic effects of temporary biventricular DDD pacing in a class III patient with ischemic cardiomyopathy. Switching from AAI to biventricular DDD pacing at the same pacing rate produces an instantaneous decrease in pulmonary capillary wedge pressure (PCWP) (mean and systolic peak) and a 32% increase in cardiac output, while the QRS duration is decreased by 35% (200 to 130 ms).