c917523a_y_Results___ClinicalTrials_gov__Description
[0] Unsuccessful Implants [Description] 
Subjects who underwent an implant attempt of a CRT-P or CRT-D device but were not successfully implanted
Biventricular Versus Right Ventricular Pacing in Heart Failure Patients With Atrioventricular Block (BLOCK HF) - Study Results - ClinicalTrials.gov