Data Collection
The data for this study was obtained by a retrospective chart review of
a prospectively maintained database for Medtronic devices. Data
collected in this retrospective chart review included baseline
demographics, relevant clinical characteristics, echocardiographic data
(pre-implantation and post-implantation visual LVEF, biplane LVEF, and
tricuspid valve regurgitation severity), LP septal implantation location
based on post-procedure chest x rays, and QRS duration based on
12-lead electrocardiogram pre-implantation and while paced.