Acute Biventricular Hemodynamic Effects of Cardiac Resynchronization Therapy in Right Bundle Branch Block.

These findings demonstrate a complex relationship between pacing configuration, AV delay and hemodynamic responses. The biventricular hemodynamic response among HF patients with RBBB might be improved by optimizing pacing modalities and AV delays. This may be particularly important among patients with diseases in which RV failure predominates, such as pulmonary hypertension and after left ventricular assist device.