Third-Degree Atrioventricular Block Secondary to Lyme Disease: A Case Report

Lyme carditis is a disseminated infection caused by the bite of an Ixodes tick with the transfer of Borrelia burgdorferi. It is characterized by flu-like symptoms, syncope, palpitations, and at times, erythema migrans. It is a rare systemic complication of Lyme disease that occurs when the initial infection is not promptly and completely treated. It is usually seen in patients who spend time outdoors and are thus more likely to get bitten by a tick, though anyone could be affected. This manuscript reports a case of Lyme carditis in a 26-year-old Caucasian male who suffered from flu-like symptoms, syncope, erythema migrans, and third-degree atrioventricular block after a known tick bite. The patient recovered with temporary pacing, doxycycline, and ceftriaxone. Having clinical suspicion of Lyme disease allows for early diagnosis and treatment, thus preventing more serious and systemic complications.