Arq. Bras. Cardiol. 2024; 121(1): e20230228
An Unusual Presentation of Lyme Carditis and Adenosine-Sensitive Atrioventricular Block
André Alexandre
, Diana Ribeiro
, Maria João Sousa, Hipólito Reis, João Silveira, Severo Torres
Introduction
Lyme carditis (LC) is a relatively rare manifestation of the early disseminated stage of LC. , The most frequent presentation of LC is atrioventricular (AV) block characterized by rapid fluctuations in the grade and that occurs in approximately 80-90% of patients. , Other possible clinical manifestations of LC are myocarditis, pericarditis, dilated cardiomyopathy, and heart failure. , The clinical course is usually mild, short-term, and in most cases completely reversible after adequate antibiotic treatment. Indeed, high-grade AV block associated with Lyme disease typically resolves within the first ten days of antibiotic therapy. The authors present a case of a young female diagnosed with early disseminated Lyme disease and cardiac manifestations, in whom AV conduction disturbances persisted after four weeks of appropriate antibiotic treatment and led to an alternative diagnosis.
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Keywords: Adenosine; Atrioventricular Block; Cardiomyopathy; Lyme Disease
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