Abstract
Background: Lyme disease is a tick-borne bacterial disease caused by spirochetes within the Borreliaceae family. Lyme carditis is a manifestation of the early disseminated stage of Lyme disease and typically arises one to two months after the initial infection. Case presentation: We present the case of a previously healthy 31-year-old man admitted to the emergency department with a thirddegree atrioventricular block. Lyme carditis was diagnosed based on positive serology and Western immunoblot assay results, despite the absence of the characteristic erythema chronicum migrans skin lesion. Following initiation of appropriate antibiotic treatment with doxycycline, there was a complete reversal of the atrioventricular block. Conclusion: Lyme carditis, a manifestation of the early disseminated stage of Lyme disease, should be considered in patients presenting with conduction abnormalities. Prompt antibiotic therapy offers a favorable prognosis, allowing for the avoidance of unnecessary permanent pacemaker implantation.
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