EM Command Center / Cardiovascular Emergencies • 3 min read • 3 sections

Pericardial Disease, Tamponade & Pericardiocentesis

Comprehensive emergency protocol for pericardial syndromes and obstructive hemodynamic collapse. Covers ECG stages of acute pericarditis (diffuse PR depression, concave ST elevation, Spodick's sign), clinical and sonographic tamponade criteria (Beck's triad, chamber collapse, pulsus paradoxus), and step-by-step emergency ultrasound-guided pericardiocentesis.

Resuscitation Quick Ribbon (First 2 Minutes)

High-Acuity

Recognize Beck's Triad:Hypotension + Jugular Venous Distension + Muffled Heart Sounds (present in only 10-40% of cases).

Pulsus Paradoxus:> 10-12 mmHg drop in systolic blood pressure during normal quiet inspiration.

Bedside POCUS:Anechoic fluid stripe + early diastolic RV free wall collapse + late systolic RA collapse + non-collapsing dilated IVC.

Temporizing Resuscitation:IV crystalloid bolus (500-1000 mL) to increase right ventricular preload; avoid positive pressure ventilation (decreases venous return and causes arrest).

Emergency Pericardiocentesis:Indicated for cardiac arrest or refractory obstructive shock; ultrasound-guided subxiphoid or apical approach with 18G spinal needle.

Bottom-Line Clinical Pearl

Cardiac tamponade is a physiological diagnosis of elevated intrapericardial pressure impairing diastolic filling. In unstable patients, aspirating as little as 15 to 30 mL of pericardial fluid during pericardiocentesis brings intrapericardial pressure below intracardiac filling pressure, immediately restoring cardiac output and blood pressure.

1. Acute Pericarditis: Clinical Features & ECG Stages

Acute pericarditis diagnosis requires at least 2 of 4 criteria: (1) Typical pleuritic chest pain (improved sitting up/leaning forward); (2) Pericardial friction rub; (3) Typical ECG changes; (4) New or worsening pericardial effusion:

ECG Stage	Timing	Electrophysiologic Hallmark	Distinguishing from STEMI
Stage 1	Hours to days	Diffuse concave-upward ST segment elevation across almost all leads (except aVR and V1) PLUS PR segment depression (most specific early sign). PR elevation in aVR. Spodick's sign (downsloping TP segment).	STEMI shows convex/tombstone ST elevation in anatomic vascular territory with reciprocal ST depression (except in aVR/V1) and dynamic evolution.
Stage 2	Days 2 to 7	ST segments and PR segments return toward baseline; T waves flatten.	Isoelectric baseline without Q-wave formation.
Stage 3	Weeks 2 to 3	Diffuse, symmetric T-wave inversions without Q waves.	T-wave inversion without loss of R-wave amplitude.
Stage 4	Weeks to months	ECG normalizes completely (or permanent chronic T-wave flattening).	Persistent deep Q waves in STEMI.

2. High-Yield Pericarditis Pharmacotherapy

Medication	Dosing Protocol	Mechanism & Duration	Clinical Caveats
Ibuprofen / Indomethacin	Ibuprofen 600-800 mg PO TID (or Indomethacin 50 mg PO TID) with meals	First-line anti-inflammatory. Continue 1-2 weeks until asymptomatic, then taper.	Add PPI for gastric mucosal protection. AVOID in post-MI pericarditis (Dressler's) -> use high-dose Aspirin.
Colchicine	0.6 mg PO BID (0.6 mg PO daily if weight < 70 kg or eGFR 30-50)	Inhibits microtubule assembly and neutrophil chemotaxis; cuts recurrence by 50%	MANDATORY adjunct to NSAIDs for 3 months. Reduce dose in renal disease; causes GI upset.
Aspirin	750 - 1000 mg PO q8h for 1-2 weeks, then taper	Agent of choice for post-myocardial infarction pericarditis	NSAIDs impair myocardial scar healing in acute MI.
Systemic Corticosteroids (Prednisone)	0.25 - 0.5 mg/kg/day PO only for refractory/autoimmune cases	Second-line fallback	STRONG RISK FACTOR FOR RECURRENT PERICARDITIS; avoid as initial routine therapy.

3. Step-by-Step Ultrasound-Guided Pericardiocentesis

Pericardiocentesis in cardiac tamponade is an emergent decompressive procedure:

Positioning: Patient in semi-Fowler position (30-45 degrees elevation) if hemodynamically tolerated, bringing fluid anteriorly and inferiorly.
Ultrasound Guidance: Use phased-array cardiac probe to identify largest fluid pocket closest to skin surface with no intervening lung tissue (subxiphoid or apical/parasternal window).
Subxiphoid Approach: Insert 18G spinal needle or pericardiocentesis needle 1 cm inferior to xiphoid and 1 cm left of midline. Angle 30-45 degrees toward left shoulder under continuous dynamic ultrasound visualization and continuous aspiration.
Apical / Parasternal Approach: Probe placed at apex (5th ICS midclavicular). Insert needle perpendicular to chest wall over upper border of rib directly into fluid pocket (shorter distance to effusion, lower complication rate under direct visualization).
Confirm Chamber Avoidance: Agitated saline ('bubble test') injected under ultrasound visualization confirms microbubbles within pericardial space, NOT right ventricular cavity.
Aspiration & Catheter Insertion: Aspirate 20-50 mL of fluid until hemodynamic recovery occurs (blood pressure rises, HR normalizes). Advance guidewire, dilate, and place pigtail catheter to gravity drainage.

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