Cardiac Manifestations of Lyme Disease.

Lyme carditis is an uncommon manifestation of Lyme disease. Most cases present with heart block of varying degrees, but the spectrum of disease includes other transient arrhythmias and structural manifestations, such as myopericarditis or cardiomyopathy. Antibiotics hasten the resolution of Lyme carditis, and cardiac pacing can be an adjunctive therapy. Outcomes are generally good, but there are rare fatalities associated with Lyme carditis. The latter underscores the continued need for improved modes of prevention of Lyme disease and the importance of its early recognition and treatment.

Lyme Carditis in Hospitalized Children and Adults, a Case Series.

BACKGROUND: Lyme carditis is an uncommon manifestation of Lyme disease. This report compares Lyme carditis presentation, management, and outcomes in pediatric and adult populations. METHODS: Charts of pediatric and adult patients with heart block (PR interval >300 ms) and positive Lyme serologies hospitalized in Portland, Maine, between January 2010 and December 2018 were analyzed. Data on medical history, presentation, treatment, and outcomes are described. RESULTS: Ten children and 20 adults were admitted for Lyme carditis between June and October. Ninety percent were male, and 87% had no prior cardiac history. Seventeen had outpatient evaluation before admission. Of these, a minority (41%) had Lyme disease suspected in the outpatient setting, and fewer (12%) were initiated on Lyme disease treatment. The most common alternate diagnoses were viral illness and erythema multiforme. More children than adults had disseminated erythema migrans and fever. First-degree heart block was more prevalent in children, and Mobitz type 2 heart block was more prevalent in adults. Ten patients presented with syncope. Proportionately more adults needed temporary pacing. Children had shorter antibiotic durations compared with adults. Of the 30 cases, 27 had improved heart block, while 3 adults required a pacemaker at discharge. Nine children and 14 adults were discharged with a PR 200-300 ms. There was a single death in this series. CONCLUSIONS: Cases tended to be younger males. Most patients had some heart block on discharge. Of patients evaluated as outpatients, Lyme disease was suspected in 41%. Improved early recognition and treatment of Lyme disease may decrease Lyme carditis.