[Lyme carditis].

BACKGROUND

Lyme carditis is a rare manifestation of systemic Lyme disease, typically occurring one to two months after infection. The most common feature is conduction system disturbance, often involving the atrioventricular (AV) node.

CASE PRESENTATION: A young woman was admitted to the emergency department after experiencing palpitations. She was haemodynamically stable and had no respiratory distress. An ECG revealed an atrioventricular block with a PR interval of 380 ms. Her medical history included a recent tick bite. Potential causes of conduction disturbances were ruled out and blood cultures were negative, while Borrelia serology showed positive IgG and borderline IgM. The patient received intravenous ceftriaxone for 21 days. Follow-up ECG revealed no abnormalities.

CONCLUSION

Lyme carditis should be considered in conduction disorders, particularly in younger patients without a cardiovascular history. The condition generally has a good prognosis, and early recognition and appropriate treatment can prevent unnecessary pacemaker implantation.