Overview
Diphtheritic myocarditis is an inflammatory condition affecting the myocardium, often complicating diphtheria infections, leading to conduction abnormalities and potentially severe cardiac dysfunction 12.Diagnosis
Clinical signs of myocarditis with history of diphtheria infection
Electrocardiographic abnormalities indicative of conduction defects
Elevated cardiac biomarkers (e.g., troponin)
Echocardiography showing ventricular dysfunction or structural abnormalities
Cardiac MRI may reveal myocardial edema or necrosis 1Management
First-line treatments: Supportive care including hemodynamic monitoring and management of heart failure symptoms
Adjunctive therapies:
- Temporary insertion of a cardiac pacemaker for severe conduction abnormalities 1
- Consideration of L-carnitine supplementation to potentially improve myocardial function by enhancing fatty acid oxidation 2Special Populations
Pediatrics: Temporary cardiac pacing may improve outcomes in children and adolescents with severe conduction defects 1Key Recommendations
Consider temporary insertion of a cardiac pacemaker in pediatric patients with diphtheritic myocarditis and severe conduction abnormalities to potentially improve survival and outcomes (Evidence: Moderate) 1
Evaluate the role of L-carnitine supplementation in diphtheritic myocarditis to support myocardial fatty acid oxidation, based on experimental evidence suggesting potential therapeutic benefit (Evidence: Weak) 2References
1 Dung NM, Kneen R, Kiem N, Bethell DB, Phu NH, Solomon T et al.. Treatment of severe diphtheritic myocarditis by temporary insertion of a cardiac pacemaker. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2002. link
2 Challoner DR, Prols HG. Free fatty acid oxidation and carnitine levels in diphtheritic guinea pig myocardium. The Journal of clinical investigation 1972. link