VHOSPITAL.CLINIC · Differential Diagnosis
Myocarditis vs Pericarditis
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Myocarditis
Myocarditis is inflammation of the heart muscle, most commonly caused by viral infections (particularly enteroviruses). It can present with chest pain, shortness of breath, palpitations, and in severe cases, heart failure or sudden death.
Condition B
Pericarditis
Pericarditis is inflammation of the pericardium (the sac surrounding the heart), causing sharp, pleuritic chest pain that improves when leaning forward. Viral infections are the most common cause; NSAIDs are the primary treatment.
Shared Symptoms — Why They're Confused
Both conditions present with 4 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Myocarditis
- Pleuritic chest pain
- Fever and fatigue
- Follows viral illness (often)
- Elevated inflammatory markers
Pericarditis
- Sharp positional pain relieved by leaning forward
- Pericardial friction rub on auscultation
- Concave ST elevation in all leads ('saddle-shaped')
- Rarely causes significant troponin rise unless myopericarditis
Distinguishing Diagnostic Tests
| Test | Myocarditis | Pericarditis |
|---|---|---|
| Troponin | Significantly elevated — myocardial cell necrosis | Mildly elevated or normal — no primary myocardial injury |
| Cardiac MRI | Myocardial oedema and LGE in non-ischaemic pattern (subepicardial) | Pericardial enhancement and thickening |
| ECG | New ST changes, bundle branch blocks, arrhythmia | Diffuse saddle-shaped ST elevation, PR depression in aVR |
Treatment Approaches
Myocarditis
- •Supportive care; restrict exercise
- •NSAIDs + colchicine if no LV dysfunction
- •Immunosuppression for giant cell myocarditis
- •ACEi + BB if LV dysfunction develops
Pericarditis
- •NSAIDs (ibuprofen or aspirin) + colchicine ×3 months
- •Activity restriction for 3 months
- •Treat underlying cause (viral, bacterial, autoimmune)
When Doctors Consider Each Diagnosis
🔵 Consider Myocarditis when:
- →Significantly elevated troponin, new LV dysfunction, arrhythmia on ECG
🟢 Consider Pericarditis when:
- →Sharp positional chest pain, pericardial rub, saddle-shaped ST elevation, minimal troponin rise
Explore Each Condition in Detail
Related Clinical Pages
Myocarditis
Medical References
Content on this page is informed by evidence-based clinical sources including:
- World Health Organization (WHO)Global health guidance and disease classification
- National Health Service (NHS)UK clinical guidelines and patient information
- National Institute for Health and Care Excellence (NICE)Evidence-based clinical practice guidelines
- Centers for Disease Control and Prevention (CDC)US public health data and clinical recommendations
- PubMed – NCBIPeer-reviewed biomedical literature and clinical studies
- Cochrane LibrarySystematic reviews and meta-analyses in evidence-based medicine
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