Lyme Carditis and Complete Heart Block: Can It Be Reversed?
Lyme carditis can disrupt heart rhythm
Heart block may become life threatening
Early treatment may reverse cardiac complications
Lyme carditis heart block is an uncommon but potentially serious complication of Lyme disease. In some cases, inflammation caused by infection affects the heart’s electrical conduction system and leads to dangerous rhythm abnormalities.
Patients and clinicians often ask whether Lyme carditis can cause complete heart block, whether it is reversible with antibiotics, and how quickly treatment must begin.
Cardiac symptoms may occur alongside other manifestations found in the Lyme disease symptoms guide, though some patients present primarily with cardiac complaints.
Can Lyme Carditis Cause Heart Block?
Yes. Lyme carditis can interfere with electrical conduction in the heart and lead to first-degree AV block, complete heart block, or dangerous rhythm disturbances.
These complications may develop rapidly and sometimes require hospitalization, telemetry monitoring, or temporary pacing.
Heart block due to Lyme disease may present with dizziness, presyncope, fainting, fatigue, palpitations, chest discomfort, or shortness of breath.
Is Lyme Carditis Reversible With Antibiotics?
Many cases of Lyme carditis improve with antibiotic treatment, particularly when recognized early.
Recovery time varies. Some patients recover within days to weeks, while severe cases may require temporary pacing support during recovery.
The following case illustrates how rapidly Lyme carditis may progress from conduction abnormalities to complete heart block.
A 26-Year-Old Man Develops Complete Heart Block
The patient was evaluated in the emergency room with presyncope (lightheadedness, muscle weakness) and worsening fatigue.
Telemetry monitoring demonstrated a “2:1 AV block alternating with complete heart block and a junctional escape rhythm in the range of 30 beats per minute,” according to Chaudhry and colleagues. [1]
Doctors suspected Lyme disease and started intravenous ceftriaxone, but within 24 hours the man’s condition had worsened.
“Twenty-four hours after admission, he had loss of junctional escape with underlying complete heart block and asystole with near syncope,” describes Chaudhry from the Department of Cardiology and Electrophysiology, Aultman Hospital, Ohio.
“Lyme carditis is a dreaded complication of disseminated Lyme disease and is caused by direct cardiac invasion by spirochetes,” he states.
The man required a pacemaker. “Emergent right subclavian access was obtained for temporary pacing and placement of an active fixation permanent pacemaker lead,” explains Chaudhry.
Serologic tests were positive by ELISA and confirmed with the Western Blot IgM.
How Lyme Carditis Affects the Heart
The authors summarize the underlying pathology.
“There is initially a transmural inflammation with macrophages and neutrophils followed by a band-like appearance of lymphocytes. Interstitial fibrosis, as well as small and large vessel vasculitis, pericarditis, myocarditis, acute coronary syndromes, and coronary artery aneurysms can potentially occur.”
Because Lyme carditis reflects disseminated infection, clinicians may also evaluate for other complications involving the nervous system or evidence of co-infections.
Temporary Pacing Allowed Recovery
The placement of an external pacemaker enabled the patient to be discharged home after 12 days while he continued to recover on IV antibiotics.
His pacemaker was removed at day 19.
This case highlights an important point: some patients with severe Lyme carditis require pacing support temporarily while antibiotics take effect.
Symptoms That May Suggest Lyme Carditis
Symptoms vary and may overlap with other cardiac or systemic illnesses.
- Dizziness or lightheadedness
- Presyncope or fainting
- Palpitations
- Chest discomfort
- Exercise intolerance
- Shortness of breath
- Fatigue
- Slow heart rate
Some symptoms may overlap with autonomic dysfunction, making evaluation more challenging.
Frequently Asked Questions
Can Lyme carditis cause complete heart block?
Yes. Lyme carditis can disrupt the electrical conduction system and lead to complete heart block in severe cases.
Can Lyme carditis be reversed?
Many patients improve with antibiotics, although severe cases may temporarily require pacing support.
What symptoms suggest Lyme carditis?
Dizziness, palpitations, fainting, chest discomfort, fatigue, shortness of breath, and exercise intolerance may occur.
How quickly can Lyme carditis progress?
Some cases progress rapidly over hours to days, making prompt evaluation important when cardiac symptoms develop.
Clinical Takeaway
Lyme carditis can lead to serious conduction abnormalities including complete heart block.
Recognition is critical because some patients deteriorate rapidly and may require hospitalization or temporary pacing support.
Early diagnosis and antibiotic treatment may improve outcomes and, in many cases, reverse cardiac complications.
Related Articles
Cardiac arrest due to Lyme disease in a child
Reversible complete heart block due to Lyme disease
Mechanisms of persistent illness
Lyme myocarditis in adolescents
References
- Chaudhry MA, Satti SD, Friedlander IR. Lyme carditis with complete heart block: management with an external pacemaker. Clin Case Rep. 2017;5(6):915-918.
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
I have the same thing…..pacemaker in for a moth now…..they called it AV node dysfunction
I had complained of palpitations for years, EKG, Echo, Holter all normal. Then thought I was having a heart attack but it was Supraventricular tachycardia, had an ablation and spent 6 days in the ICU. Because I didn’t have a fever they ignored the fact I said I had Lyme but wasn’t CDC positive anymore. Now I need another ablation my heart is fluttering and keeping me up at night……I need a real doctor!
There is not enough known about cardiac manifestations of Lyme disease. I would be reasonable to see a doctor with experience treating Lyme disease as part of your evaluation particularly given you apparently had Lyme disease in the past.
Hi dana, did you ever take antibiotics for Lyme prior to the palpitations?
After surviving 4 cardiac arrests due(back to back to back to back) to Lyme Carditis, I received an implant. Looking back at the day of the Cardiac arrests, I recall the symptoms being identical to heart attack patients. i.e. muscle weakness, headaches, neck pain, arm weakness, fatigue, etc. Warning to all: Do not ignore these symptoms even though it’s not recognizable. It will kill you if it goes unchecked.
Hello
My son had lyme carditis my concern is was he treated adequately? What would confirm that?
I typically have ask my patient to follow up. They may have other symptoms that he did not recogniz that have not resolved
I have patients with heart block, a type of Lyme carditis that resolved within days. I have more complex cases requiring ongoing work with a cardiologist. I do not have a blood test that helps determine if Lyme disease has resolved. I have to assess each of my patients