ArticleEuropean heart journal. Case reports2026
Left ventricular outflow tract obstruction following left bundle branch area pacing: a case report.
Article in European heart journal. Case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Left bundle branch area pacing (LBBAP) is a physiological pacing strategy considered safe in non-obstructive hypertrophic cardiomyopathy (HCM). Its effect on left ventricular outflow tract (LVOT) obstruction in anatomically predisposed patients remains unclear. Case summary: A 76-year-old woman underwent LBBAP for atrioventricular nodal dysfunction. One week later, she developed chest pain and elevated troponin, despite unobstructed coronaries. Echocardiography revealed a resting LVOT gradient of 112.6 mmHg. Bipolar low-voltage pacing worsened the gradient, while unipolar high-voltage pacing reduced it to 15 mmHg, with symptom relief and improved global longitudinal strain. Discussion: This case illustrates a rare interaction between pacing configuration and LVOT dynamics. It emphasizes the need to recognize pacing-induced obstruction, particularly in patients with septal hypertrophy or mitral anomalies, and to adjust programming accordingly.
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