The left atrial appendage (LAA) is a small muscular extension that grows from the anterolateral wall of the left atrium, in the proximity of the left pulmonary veins. The presence of a membrane in the LAA is a rare clinical entity whose origin is not known. Its clinical implication in the genesis of atrial arrhythmias and thromboembolic risk remains unknown. We report a case of an obstructive membrane located at the base of the LAA, found incidentally in a young patient who was initially undergoing a transesophageal echocardiogram prior to an invasive treatment for atrial fibrillation.

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Introduction and objectives: Cocaine is an illegal psychoactive substance that meets the criteria for substance dependence and abuse. In 2012, the estimated annual global prevalence of cocaine use remained stable, with around 0.3% and 0.5% of the adult population

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