Cardiac ResynchronizatiOn and arrhythmiaS Sensing Via the LEFT Bundle.

Cardiac ResynchronizatiOn and arrhythmiaS Sensing Via the LEFT Bundle. The CROSS LEFT Study.

Evaluation of ventricular arrhythmias sensing via a left bundle branch area pacing lead.

Inclusion Criteria:

• Ischemic or non-ischemic cardiomyopathy
• Left ventricular ejection fraction ≤35% despite optimal medical therapy
• Left bundle branch block with QRS ≥130 milliseconds

Exclusion Criteria:

• Previously implanted intra-cardiac material