Treatment of Lyme Disease in Lyme Carditis with or at Risk for Severe Cardiac Complications
Lyme carditis with significant cardiac involvement requires a distinct, structured management approach. Patients presenting with marked conduction abnormalities or evidence of myopericarditis represent a high-risk subgroup warranting hospitalisation and close monitoring.
Clinical Scenario
This protocol applies to patients with Lyme carditis who present with or are at risk for severe cardiac complications: significant PR prolongation (PR > 300 milliseconds), other arrhythmias, or clinical manifestations of myopericarditis. Hospital admission with continuous ECG monitoring is recommended for this population.
Treatment Goals
The primary goal is evidence of clinical improvement, with substantial improvement in cardiac conduction. Electrocardiographic monitoring is continued until conduction abnormalities have resolved.
Management Approach
Hospitalised patients with severe Lyme carditis are initially managed with intravenous antibiotic therapy. Once clinical improvement is evident, treatment is transitioned to an oral antibiotic regimen to complete the course.
Antibiotic selection, sequencing, and total duration are detailed in the full protocol.
References
- In patients with or at risk for severe cardiac complications of Lyme disease including those with significant PR prolongation (PR > 300 milliseconds), other arrhythmias, or clinical manifestations of myopericarditis, we recommend hospital admission with continuous ECG monitoring (strong recommendation, very low-quality evidence).
- In the hospitalized patient with Lyme carditis, we suggest initially using IV ceftriaxone over oral antibiotics until there is evidence of clinical improvement, then switching to oral antibiotics to complete treatment (weak recommendation, very low-quality evidence).
- For the treatment of Lyme carditis, we suggest 14–21 days of total antibiotic therapy over longer durations of treatment (weak recommendation, very low-quality evidence).
- Oral antibiotic choices for Lyme carditis are doxycycline, amoxicillin, cefuroxime axetil, and azithromycin.
- In the setting of AV block, electrocardiographic monitoring should be continued until there is substantial improvement in cardiac conduction.