Sinoatrial Blocks in Hyperthyroidism Treated with Beta-Blockers: A Case of Paradoxical Treatment

We describe an interesting case of a 52 year-old patient affected by thyrotoxicosis crisis, in whom sinoatrial blocks were associated with syncope and treated effi ciently with beta-blockers. We hypothesized the Bezold-Jarisch refl ex as the mechanism which leads to bradycardia and hypotension with syncope related to prolonged tachycardia. This hypothesis has not been, to our knowledge, considered in previous studies and offers therapeutic methods, as the patient was not treated with permanent pacing. Case Report Sinoatrial Blocks in Hyperthyroidism Treated with Beta-Blockers: A Case of Paradoxical Treatment Caterina Chiara De Carlini1*, Ester Meles1, Roberto Galbiati1, Marco Di Sabato1, Gaetano Gentile1, Andrea Farina2 and Stefano Maggiolini1 1Division of Cardiology, Ospedale S. Leopoldo Mandic, Merate (LC), Italy 2Division of Cardiology, Ospedale A. Manzoni, Lecco, Italy Dates: Received: 22 February, 2017; Accepted: 15 March, 2017; Published: 16 March, 2017 *Corresponding author: De Carlini Caterina Chiara, Cardiology Unit, SL Mandic Hospital, Largo Mandic 1, Merate (Lecco), Italy, Tel: 039-039-5916521; Fax: 039039-5916471; E-mail: