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Transcatheter aortic valve implantation (TAVI) has become the preferred treatment for patients with symptomatic severe aortic valve stenosis. Newer-generation devices, increased operator experience, and improved patient selection have contributed to a reduction in complication rates. However, the occurrence of new-onset left bundle branch block (LBBB) after TAVI remains high, and currently it is the most common complication associated with the procedure. This review discusses the current understanding of new-onset LBBB, including its causes, incidence, clinical outcomes, and management strategies.