cardiac resynchronization

late sodium current

left bundle branch

lv lead

resynchronization therapy crt

septal defect

subaortic stenosis

ventricular fibrillation

chest pain

Circulation-arrhythmia and Electrophysiology

Left bundle branch block may be due to conduction system degeneration or a reflection of myocardial pathology. Left bundle branch block may also develop following aortic valve disease or cardiac procedures. Patients with heart failure with reduced ejection fraction and left bundle branch block may respond positively to cardiac resynchronization therapy. Lead placement via the coronary sinus is the mainstay approach of cardiac resynchronization therapy. However, other options, including physiological pacing, are being explored. In this review, we summarize the salient pathophysiologic and clinical aspects of left bundle branch block, as well as current and future strategies for management.

Left Bundle Branch Block