Affects approximately 10 to 20% of treated patients
Pathophysiology uncertain
May reflect immune dysregulation
Post-infectious mechanism
Not active persistent infection
Management approach
Symptom-directed therapy
Exclude reinfection or alternative diagnoses
Prolonged antibiotics contraindicated
Patient Discharge Instructions
copy discharge instructions
Lyme disease home care
Take all antibiotics exactly as prescribed until finished
Do not stop early even if feeling better
Doxycycline take with food and full glass of water
Remain upright for 30 minutes after doxycycline dose to prevent esophageal ulceration
Sun protection with doxycycline
Sunscreen and protective clothing while outdoors
Risk of severe sunburn photosensitivity reaction
Activity guidance
Rest as tolerated during antibiotic course
Resume gradual activity as symptoms improve
Avoid strenuous activity if cardiac symptoms present until cleared by physician
Warning signs to return to ER
Cardiac symptoms
Fainting or near-fainting episodes
Palpitations or irregular heartbeat
Shortness of breath with minimal activity
Chest pain or pressure
Neurologic symptoms
Facial drooping on one or both sides
Severe headache with neck stiffness
Confusion or unusual behavior
Weakness or numbness in arms or legs
Severe joint swelling
Hot swollen joint with high fever
Inability to bear weight on joint
Allergic reaction to antibiotics
Hives rash or swelling
Difficulty breathing
Fever with rash after starting medication
Worsening overall symptoms after 48 to 72 hours of antibiotics
High fever not improving
Inability to keep medications down
Follow-up instructions
Primary care physician within 2 to 3 days
Return for repeat ECG if PR prolongation noted at discharge
Notify physician if symptoms not improving within 3 to 5 days of starting antibiotics
Tick prevention education
Check skin thoroughly after outdoor activity
Pay attention to scalp armpits and groin
Shower within 2 hours of outdoor activity
Remove attached ticks promptly
Use fine-tipped tweezers close to skin surface
Pull upward with steady even pressure
Do not crush twist or burn tick
Permethrin-treated clothing for outdoor activities
DEET-based repellent on exposed skin
References
Guidelines and key sources
IDSA AAN ACR guidelines
2020 IDSA AAN ACR Clinical Practice Guidelines for Prevention Diagnosis and Treatment of Lyme Disease
Comprehensive evidence-based recommendations for all disease stages
Strong recommendation against prolonged antibiotic therapy for post-treatment syndrome
IDSA Level of Evidence framework used for antibiotic duration and selection
Cardiac Lyme disease references
Suspicious Index in Lyme Carditis SILC score validation studies
Risk stratification for AV block in suspected Lyme carditis
Emergency medicine application
American Heart Association guidance on Lyme carditis and pacing indications
Neuroborreliosis references
Rule of 7s validation studies in pediatric Lyme meningitis
Distinguishes Lyme from aseptic meningitis in endemic areas
European Federation of Neurological Societies guidance on neuroborreliosis
Coding standards
ICD-10 A69.20 Lyme disease unspecified
ICD-10 A69.21 Meningitis due to Lyme disease
ICD-10 A69.22 Other neurologic disorders in Lyme disease
ICD-10 A69.23 Arthritis due to Lyme disease
ICD-10 I44.2 AV block complete when Lyme carditis presenting feature
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.