In a patient with acute chest pain, diffuse ST‑segment elevation and PR‑segment depression on ECG, no pericardial effusion on bedside echo, left‑arm and bilateral‑hand numbness, and reproducible chest wall tenderness, should I manage them as an outpatient case of acute pericarditis or treat as costochondritis?

Manage as Acute Pericarditis, Not Costochondritis

This patient meets diagnostic criteria for acute pericarditis and requires treatment as such—the presence of chest wall tenderness does not exclude pericarditis and should not redirect diagnosis to costochondritis. 1

Diagnostic Reasoning

Your patient fulfills at least 2 of the 4 required criteria for acute pericarditis per 2015 ESC Guidelines 1:

1. ✓ ECG changes: Diffuse ST-segment elevation AND PR-segment depression (classic Stage I pericarditis pattern)
2. ✓ Pericarditic chest pain (implied by presentation)
3. ✗ No pericardial effusion on bedside echo
4. ? Pericardial rub not documented

The ECG findings alone are highly specific—diffuse ST elevation with PR depression is pathognomonic for pericarditis, not costochondritis, which produces no ECG changes 1. While early repolarization can mimic some features, it does not produce PR depression 2.

Critical Pitfall: Don't Be Misled by Chest Wall Tenderness

Reproducible chest wall tenderness does NOT exclude pericarditis. The pericardium itself is electrically inert, but inflammation involves the epicardium and can cause localized chest wall sensitivity 1. Many clinicians incorrectly assume tenderness = costochondritis, but this overlooks that:

• Pericarditis causes pleuritic pain that worsens with inspiration/movement
• Patients may guard and develop secondary musculoskeletal tenderness
• The two conditions can coexist

The ECG is the decisive factor here—costochondritis never causes ST-segment or PR-segment changes 3.

Address the Neurological Symptoms

The left-arm and bilateral-hand numbness requires brief consideration but should not delay pericarditis treatment:

• Rule out ACS with troponin (already part of pericarditis workup) 1
• Consider cervical radiculopathy or thoracic outlet syndrome as separate issues
• These symptoms are atypical for pericarditis but don't negate the diagnosis

Risk Stratification for Outpatient Management

Outpatient management is appropriate ONLY if this patient lacks high-risk features 1:

Major Risk Factors Requiring Hospitalization:

• High fever >38°C (>100.4°F)
• Subacute course (symptoms over several days)
• Large pericardial effusion (>20mm diastolic echo-free space)
• Cardiac tamponade
• Failure to respond to NSAIDs within 7 days

Minor Risk Factors Also Warranting Admission:

• Myopericarditis (check troponin)
• Immunosuppression
• Trauma history
• Oral anticoagulant therapy

If your patient has ANY of these risk factors, hospital admission is mandatory 1. The guidelines are explicit: only low-risk patients without predictors of poor prognosis can be managed outpatient 1.

Recommended Outpatient Management (If Low-Risk)

If no high-risk features are present:

1. Initial workup 1:

   • CRP and ESR (baseline inflammatory markers)
   • Troponin (rule out myopericarditis)
   • Chest X-ray (rule out pleuro-pulmonary disease)
   • Complete the echo if not already done

2. First-line therapy 1, 4:

   • NSAIDs: Ibuprofen 600-800mg TID or aspirin 750-1000mg TID for 1-2 weeks
   • Colchicine: 0.5-0.6mg BID (reduce recurrence risk from 30% to 10%)
   • Gastroprotection: PPI with NSAIDs

3. Activity restriction: No exercise or strenuous activity until symptoms resolve and CRP normalizes 5

4. Mandatory follow-up at 1 week to assess response to therapy 1

When to Hospitalize Instead

Admit immediately if:

• Any major or minor risk factors present
• Diagnostic uncertainty remains after workup
• Patient cannot reliably follow up in 1 week
• Social situation precludes safe outpatient monitoring

The 2015 ESC Guidelines emphasize that any clinical presentation suggesting an underlying etiology or with at least one predictor of poor prognosis warrants hospital admission 1.

Avoid These Common Errors

• Don't use corticosteroids first-line—they increase recurrence rates and should be reserved for specific indications (connective tissue disease, uremia, pregnancy) 6, 5, 4
• Don't dismiss the ECG findings—they trump physical exam findings in this scenario
• Don't treat as costochondritis and miss pericarditis—this risks complications including tamponade, recurrence, and constrictive pericarditis
• Don't skip colchicine—it's essential for preventing recurrence 4