title: Berberine behind the thriller of marked symptomatic bradycardia.
abstract: Patients with chronic aortic dissections are at high risk of catheter-induced complications. We report a Berberine is used in traditional Chinese medicine for the treatment of congestive heart failure, hypertension, diabetes, and dyslipidaemia and has a good safety profile. We report a case of a 53-year-old sportsman referred to our hospital for the onset of fatigue and dyspnoea upon exertion after he started berberine to treat hypercholesterolaemia. An electrocardiogram showed sinus bradycardia (45 bpm), first-degree atrioventricular block, and competitive junctional rhythm. An ergometric stress test showed slightly reduced chronotropic competence and the presence of runs of competitive junctional rhythm, atrial tachycardia, and sinus pauses in the recovery. After 10 d of wash-out from berberine, the patient experienced a complete resolution of symptoms, and an ergometric stress test showed good chronotropic competence. An electrocardiogram Holter showed a latent hypervagotonic state. This is the first case report that shows that berberine could present certain side effects in hypervagotonic people, even in the absence of a situation that could cause drug accumulation. Therefore, berberine's use should be carefully weighed in hypervagotonic people due to the drug's bradycardic and antiarrhythmic properties, which could became proarrhythmic, exposing patients to potential health risks.
authors.affiliation: Margherita Cannillo, Simone Frea, Cristina Fornengo, Elisabetta Toso, Fiorenzo Gaita, Division of Cardiology, Cardiovascular Department, AOU S. Giovanni Battista di Torino and University of Torino, 10100 Torino, Italy.
authors.forename: Margherita
authors.initials: M
authors.lastname: Cannillo
authors.forename: Simone
authors.initials: S
authors.lastname: Frea
authors.forename: Cristina
authors.initials: C
authors.lastname: Fornengo
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Toso
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Mercurio
authors.forename: Stefania
authors.initials: S
authors.lastname: Battista
authors.forename: Fiorenzo
authors.initials: F
authors.lastname: Gaita
keywords: Berberine; Bradyarrhythmia; Electrocardiogram; Hypercholesterolaemia; Hypervagotonia; Side effect