Left ventricular dysfunction is related to the presence and extent of a septal flash in patients with right ventricular pacing.

Aims: Septal flash (SF), a marker of left ventricular (LV) dyssynchrony in the presence of a left bundle branch block (LBBB), has been shown to predict improved ventricular function and outcome when corrected with cardiac resynchronization therapy. We hypothesized that a SF is present in patients receiving right ventricular (RV) pacing and its presence and extent could predict the development of LV dysfunction and remodelling.

Methods And Results: Seventy-four consecutive patients receiving conventional RV pacing (>6 months, >85% paced) were studied with two-dimensional (2D) echocardiography.

Improvement in hemodynamic response using a quadripolar LV lead.

Background: The Quartet quadripolar lead (St. Jude Medical Inc., St.