USMLE Prep - Medical Reference Library

Acute Pericarditis — Diagnosis and Treatment

System: Cardiology • Reviewed: Aug 31, 2025 • Step 1Step 2Step 3

Synopsis:

Sharp pleuritic chest pain relieved by sitting forward with pericardial friction rub; diffuse ST elevation and PR depression on ECG; treat with NSAID and colchicine after excluding high risk causes and tamponade.

Key Points

  • Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
  • Use system-specific risk tools to guide testing and disposition.
  • Order high-yield tests first; escalate imaging when indicated.
  • Start evidence-based initial therapy and reassess frequently.

Algorithm

  1. Primary survey and vitals; IV access and monitors.
  2. Focused history/physical; identify red flags and likely etiologies.
  3. Order system-appropriate labs and imaging (see Investigations).
  4. Initiate guideline-based empiric therapy (see Pharmacology).
  5. Reassess response; arrange consultation and definitive management.

Clinical Synopsis & Reasoning

For Acute Pericarditis Dx Treatment, frame the differential by acuity and pathophysiology, then align diagnostics to the leading hypotheses. Prioritize stabilization while obtaining high‑yield studies such as EKG (Rhythm/ischemia), Troponin (Myocardial injury), CXR (Pulmonary edema/size), BMP/Mg2+ (Electrolytes/renal). Incorporate bedside imaging and targeted labs to define severity and identify complications; synthesize results with clinical trajectory to refine the working diagnosis and disposition needs.


Treatment Strategy & Disposition

Initiate disease‑directed therapy alongside supportive care, titrating to objective response. Pharmacologic options commonly include Aspirin, P2Y12 inhibitor, Heparin/LMWH, Beta-blocker. Use validated frameworks (e.g., Therapeutic Snapshot) to guide escalation and site of care. Address precipitating factors, de‑escalate empiric therapies with data, and arrange follow‑up for monitoring and risk‑factor modification; admit patients with instability, high risk of deterioration, or needs for close monitoring.


Epidemiology / Risk Factors

  • Atherosclerotic risk (HTN, DM, HLD, smoking)
  • Age/family history of premature CAD

Investigations

TestRole / RationaleTypical FindingsNotes
EKGRhythm/ischemiaST-T changes/arrhythmiaSerial
TroponinMyocardial injuryDynamic rise/fallTrend
CXRPulmonary edema/sizeCardiomegaly/edema
BMP/Mg2+Electrolytes/renalDerangements
CBC/CoagsBleeding riskAbnormal/INR

Therapeutic Snapshot

MedicationExample
NSAIDIbuprofen 600–800 mg TID
Colchicine0.5–0.6 mg once or twice daily
PPIFor gastroprotection when needed

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
NSAID (ibuprofen)COX inhibitionHoursFirst-line pain/inflammationGI/renal risk
ColchicineMicrotubule inhibitionDaysReduce recurrenceDiarrhea

Prognosis / Complications

  • Prognosis by ischemic burden/LV function
  • Arrhythmias and HF are complications

Patient Education / Counseling

  • Explain red flags and when to seek emergent care.
  • Reinforce medication adherence and follow-up plan.

Notes

Consider autoimmune, uremic, and post pericardiotomy etiologies. Steroids increase recurrence and are reserved for select cases.


References

  1. ESC Pericardial Disease Guideline — Link
  2. AHA Pericardial Disease Statements — Link