PericardialEffusion

Pericardial effusion + cardiac tamponade · complete reference · pericardiocentesis technique + fluid analysis · Full Card

Symptoms / Associated Sx

• Small effusions (<100 mL): usually asymptomatic; incidental on echo; may have dull chest discomfort

• Moderate-large effusions (>200–300 mL): dyspnea; positional chest heaviness; cough (bronchial compression); hiccups (phrenic nerve); dysphagia (esophageal compression)

• Cardiac tamponade: Beck triad (JVD + hypotension + muffled heart sounds) — present in only 30–40% of cases; absence does NOT exclude tamponade; pulsus paradoxus >10 mmHg (SBP drops >10 mmHg with normal inspiration) — best bedside test; tachycardia (compensatory); diaphoresis; AMS; cool extremities (↓CO)

• Pulsus paradoxus measurement: inflate BP cuff above systolic; deflate slowly; first Korotkoff sound heard only during expiration = systolic during expiration; continue deflating until Korotkoff sounds heard throughout cycle = systolic during inspiration; difference >10 mmHg = pulsus paradoxus; >25 mmHg = severe tamponade

Neg

• Pt denies JVP rising with inspiration (Kussmaul sign) + audible early diastolic pericardial knock + diastolic pressure equalization on RHC — argues against constrictive pericarditis (constriction: Kussmaul sign pathognomonic; tamponade has pulsus paradoxus but no Kussmaul; constrictive pericarditis requires pericardiectomy, not pericardiocentesis; CT pericardial thickening/calcification helps confirm)

• Pt denies RV dilation + McConnell sign + CT-PA-confirmed PE as cause of RV compression — argues against massive PE as source of shock (PE: RV dilation from ↑pulmonary afterload, not pericardial compression; treatment is anticoag + tPA, not pericardiocentesis; echo distinguishes: PE = RV dilation without circumferential effusion; tamponade = effusion + RV diastolic collapse)

• Pt denies tearing chest/back pain + BP differential between arms + widened mediastinum suggesting Type A aortic dissection as cause of hemopericardium — argues against performing pericardiocentesis (Type A dissection + hemopericardium: pericardiocentesis removes tamponade effect on the aortic tear → acute decompression → massive aortic hemorrhage → death; CTA first; cardiac surgery is the treatment)

• Pt denies B-lines on lung US + S3 + orthopnea + displaced PMI without circumferential pericardial effusion — argues against cardiogenic pulmonary edema being confused with tamponade (HF: pulmonary edema present; tamponade: clear lung fields; echo distinguishes)

Social History (SHx)

• Known malignancy (type, stage, prior chemotherapy/radiation — lung, breast, lymphoma, mesothelioma most common; malignant effusions often bloody; cytology on fluid confirms); prior pericarditis (inflammatory effusion — treat underlying pericarditis); CKD/dialysis status (uremic pericarditis — BUN >60)

• Autoimmune disease (SLE — most common cause in young women; serositis; ANA + anti-dsDNA); thyroid history (hypothyroidism — myxedema pericardial effusion; TSH >10; slow resolution with levothyroxine [Synthroid]); prior cardiac surgery (post-pericardiotomy syndrome — serosanguineous effusion weeks to months post-op); anticoagulation (hemorrhagic effusion; ↓threshold for drainage)

Main Etiology

• Malignancy (most common large effusion in hospital setting): lung cancer (pleural extension), breast cancer, lymphoma (often very large), mesothelioma, leukemia; bloody fluid; cytology diagnostic (sensitivity 80–95%); treatment of underlying malignancy; pericardial window or sclerotherapy for recurrence

• Inflammatory/infectious: viral pericarditis (Coxsackievirus/echovirus); bacterial (purulent — S. aureus); TB (worldwide most common cause of large chronic effusion; adenosine deaminase [ADA] >40 U/L on fluid = TB; RIPE + steroids ↓constrictive risk)

• Uremic pericarditis: BUN >60 mg/dL; fibrinous exudate; intensify hemodialysis → resolves in 1–2 weeks; NSAIDs less effective; recurrence indicates inadequate dialysis

• Hypothyroid myxedema: typically large but slowly accumulating (no tamponade despite large size — pericardium adapts slowly); TSH >10; levothyroxine (Synthroid) → gradual resolution over weeks to months

• Hemopericardium: Type A aortic dissection (hemorrhagic — DO NOT drain; cardiac surgery); post-MI free wall rupture (PEA arrest); iatrogenic post-cardiac procedure; trauma; anticoagulation-related

• Post-cardiac surgery/post-pericardiotomy syndrome: develops weeks to months post-operatively; serosanguineous; treat as inflammatory; may be loculated (surgical window if pericardiocentesis not feasible)

RF

• Known malignancy (lung/breast/lymphoma/mesothelioma — highest risk); prior pericarditis; CKD (BUN >60 = uremic threshold); SLE/autoimmune disease; hypothyroidism; TB exposure; prior cardiac surgery or radiation to chest; anticoagulation (↑hemorrhagic effusion rate); Type A aortic dissection (hemopericardium)

Data

• Echo TTE — bedside immediately if tamponade suspected (gold standard for diagnosis and drainage guidance; effusion size classification: trivial [echo-free space <10 mm]; small [10–20 mm]; moderate [20–25 mm]; large [>25 mm]; tamponade echo findings: RV free wall diastolic collapse [most specific — RV collapses inward during diastole when intrapericardial pressure exceeds RV diastolic pressure]; RA systolic collapse [>1/3 of systole = specific]; IVC plethora [>21 mm with <50% respiratory variation]; mitral E-wave inspiratory variation >25%; tricuspid E-wave inspiratory variation >40%; swinging heart [large effusion with cardiac motion swinging freely])

• ECG (low voltage in all leads [amplitude <5 mm limb leads; <10 mm precordial] = large pericardial effusion; electrical alternans [beat-to-beat alternation in QRS amplitude — caused by swinging motion of heart in large effusion] = highly specific for tamponade when present; sinus tachycardia — compensatory; PR depression if pericarditis component)

• CXR portable (water-bottle/flask-shaped cardiomegaly with effusion >200–250 mL; clear lung fields [distinguishes from HF where pulmonary edema present]; rapid enlargement of cardiac silhouette from prior CXR = effusion until proven otherwise; sensitivity low for small effusions)

• Pericardial fluid analysis (after drainage) (send immediately: Light criteria [exudate vs transudate: fluid protein/serum protein >0.5 OR fluid LDH/serum LDH >0.6 OR fluid LDH > 2/3 upper limit normal = exudate; transudate = HF/hypothyroid/uremic]; cell count + differential [neutrophils = bacterial; lymphocytes = viral/TB/malignant]; glucose; protein; LDH; Gram stain + culture; cytology [malignancy — sensitivity 80–95%; send maximum volume]; AFB smear + culture + PCR; adenosine deaminase [ADA] >40 U/L = TB; flow cytometry if lymphoma suspected; hematocrit if hemorrhagic — hemopericardium if hematocrit similar to blood)

• BMP (BUN/Cr — uremic pericarditis threshold BUN >60; K+ — CKD management; electrolytes)

• TSH + free T4 (hypothyroidism — myxedema effusion; TSH >10 in moderate-severe hypothyroidism; typically very large painless effusion)

• ANA + anti-dsDNA + C3/C4 + RF + anti-CCP (autoimmune screen); CBC (leukocytosis = bacterial; anemia = malignancy/hemolysis); coagulation studies (anticoagulation status); blood cultures if purulent suspected; HIV serology if risk factors

DDx

Constrictive pericarditis (Kussmaul sign + pericardial knock + diastolic pressure equalization on RHC — pericardiectomy; no circumferential effusion; pulsus paradoxus absent or mild) · RHF/massive PE (RV dilation from ↑pulm pressure without circumferential effusion — anticoag + tPA; NOT pericardiocentesis) · Type A aortic dissection with hemopericardium (tearing pain + BP differential — CTA first; cardiac surgery; pericardiocentesis alone is fatal) · HF causing small effusion (pulmonary edema + S3 + displaced PMI — treat HF; effusion is secondary; echo distinguishes: small posterior effusion in HF vs circumferential large effusion in tamponade) · Pleural effusion (posterior on echo behind descending aorta; meniscus sign on CXR; thoracentesis)

Home Meds

• Hold anticoagulants (warfarin [Coumadin]/DOACs/heparin) — ↑hemorrhagic conversion of inflammatory effusion; ↑tamponade risk; restart only after effusion resolves and drainage catheter removed

• Treat underlying cause: levothyroxine (Synthroid) 12.5–25 mcg PO daily for hypothyroid (start low — cardiac risk); aspirin (Bayer) + colchicine (Colcrys) if pericarditis component; intensify hemodialysis for uremic; chemotherapy/immunotherapy for malignant

• Hold NSAIDs in large effusions (↑hemorrhagic risk); aspirin (Bayer) preferred if anti-inflammatory needed

Plan

• Hemodynamic assessment and echo classification:

  • No tamponade physiology on echo + hemodynamically stable → observe; treat underlying cause; repeat echo in 24–48h (or sooner if symptoms change)

  • Tamponade physiology on echo (RV diastolic collapse + IVC plethora) + hemodynamically stable → close monitoring + cardiology; pericardiocentesis if worsening; elective drainage if large effusion with tamponade physiology

  • Hemodynamic tamponade (SBP <90 + pulsus paradoxus >10 + RV collapse) → pericardiocentesis immediately

• Pericardiocentesis — echo-guided technique:

  • Positioning: supine with HOB 30–45° (pools fluid anteriorly/inferiorly); bilateral arm IVs; continuous ECG + echo monitoring; atropine 0.5 mg IV on bedside (vagal reaction during procedure)

  • Subxiphoid approach (preferred — safest): insert 18G needle 1–2 cm below and left of xiphoid at 45° angle pointing toward left shoulder; advance slowly under echo guidance watching for needle tip in pericardium; aspirate — bloody fluid (check hematocrit — if similar to serum = cardiac puncture; if dark non-clotting = old hemopericardium/malignant)

  • Seldinger technique: guidewire through needle → serial dilators → 7–8 Fr pigtail drain catheter left in pericardial space; aspirate minimum volume for hemodynamic stability; close drainage catheter after initial aspiration; complete drainage over 24–48h

  • If bloody return + hemodynamic improvement = tamponade confirmed; if bloody return + no improvement = cardiac chamber puncture → withdraw needle; do NOT drain cardiac chambers

  • ECG injury current (STE in monitoring lead) = myocardial contact → withdraw needle slightly

  • Drain until output <25–50 mL/24h; send ALL fluid as above; echo before drain removal

• Fluid resuscitation (bridge only): NS 500 mL IV bolus (↑preload temporarily); vasopressors: norepinephrine (Levophed) 0.1–0.5 mcg/kg/min if SBP <80 (bridge to drainage only); avoid diuretics (↓preload → ↓CO in tamponade); avoid positive pressure ventilation if possible (↓venous return → ↓CO)

• Treat underlying etiology:

  • Malignant effusion: systemic oncology treatment; intrapericardial sclerotherapy (bleomycin or cisplatin) for recurrent malignant effusion; pericardial window (surgical) for recurrence or loculated effusion

  • Uremic pericarditis: intensify hemodialysis (daily sessions ×1–2 weeks); effusion typically resolves; if not → pericardiocentesis

  • Inflammatory/pericarditis: aspirin (Bayer) 750–1000 mg PO TID + colchicine (Colcrys) 0.5 mg PO BID ×3 months

  • Hypothyroid myxedema: levothyroxine (Synthroid) 12.5–25 mcg PO daily (start low in cardiac disease; titrate q4–6 weeks; effusion resolves over weeks to months)

  • TB pericarditis: RIPE therapy (rifampin [Rifadin] + isoniazid [INH] + pyrazinamide [PZA] + ethambutol [Myambutol]) + prednisolone (Deltasone) 1 mg/kg/day PO ×6 weeks → taper (↓constrictive pericarditis risk); ADA >40 U/L = TB highly likely

  • Hemopericardium (Type A dissection/post-MI rupture): cardiac surgery immediately; do NOT drain alone

• Pericardial window (surgical): recurrent effusion after ≥2 pericardiocenteses; loculated effusion not accessible percutaneously; purulent pericarditis (surgical drainage superior to aspiration); malignant effusion with short prognosis (pleurapericardial window into pleural space for continuous drainage)

• PT/OT eval and treat — bed rest until hemodynamically stable; mobilize once effusion draining and hemodynamics stable; activity restriction per pericarditis guidelines if inflammatory etiology

• Trend daily: echo (effusion size q24–48h; RV diastolic collapse; IVC plethora); pericardial drain output (remove if <25–50 mL/24h); bilateral arm BP + pulsus paradoxus q4–8h if tamponade physiology; BMP (Cr/K+ — uremic management; Na+); troponin if iatrogenic cardiac puncture suspected; cytology result at 48–72h; fever curve (bacterial/TB)

• Escalation triggers: hemodynamic tamponade (SBP <90 + pulsus >10 + RV collapse) → pericardiocentesis immediately · PEA arrest + effusion → emergency subxiphoid pericardiocentesis without echo (50 mL relief may restore output) · hemopericardium from Type A dissection → cardiac surgery now; pericardiocentesis contraindicated · post-pericardiocentesis reaccumulation → repeat drainage vs surgical window · purulent pericarditis → surgical drainage urgently · constrictive pericarditis developing → pericardiectomy evaluation

• Discharge: treat underlying etiology at effective doses; colchicine (Colcrys) 0.5 mg PO BID ×3 months if inflammatory; aspirin (Bayer) + taper if pericarditis component; levothyroxine (Synthroid) if hypothyroid; hold anticoagulants until effusion fully resolved on echo (then restart); echo at 4 weeks post-drainage (confirm resolution); cardiology f/u 2–4 weeks; if malignant → oncology f/u urgently; activity restriction per pericarditis guidelines if inflammatory; return immediately: dyspnea + lightheadedness + neck vein distension → ED (tamponade recurrence)

⚠ Red Flags

• Pericardiocentesis in Type A aortic dissection with hemopericardium → removes tamponade effect on aortic tear → acute massive hemorrhage → death; CTA first; cardiac surgery is the only treatment; clinical clue: tearing chest/back pain + wide mediastinum + hemopericardium on echo = dissection until proven otherwise

• Beck triad present in only 30–40% of tamponade cases — absence of full triad does NOT exclude tamponade; diagnose tamponade by echo + hemodynamic criteria (pulsus paradoxus >10 mmHg + RV diastolic collapse on echo + tachycardia) in any hemodynamically compromised patient with effusion

• Bloody pericardial fluid during pericardiocentesis → check hematocrit: if similar to serum = cardiac chamber puncture → withdraw immediately; do not drain; if dark non-clotting = old hemopericardium (malignant/post-MI) = continue drainage

• Diuretics in cardiac tamponade → ↓preload → ↓CO → hemodynamic collapse; tamponade requires drainage, not diuresis; mistaking tamponade for cardiogenic pulmonary edema and giving furosemide (Lasix) = dangerous

• Constrictive pericarditis mistaken for tamponade → pericardiocentesis performed unnecessarily; constriction = Kussmaul sign + diastolic pressure equalization on RHC + pericardial thickening on CT; treatment = pericardiectomy, not pericardiocentesis

Senior IM Resident Pearls

• Tamponade is a clinical + echo diagnosis — not echo alone: echo shows tamponade physiology (RV diastolic collapse + IVC plethora); hemodynamic tamponade requires both echo findings AND clinical compromise (pulsus paradoxus >10 mmHg + tachycardia + hypotension); small effusions can cause tamponade if rapid accumulation; large effusions may not cause tamponade if slow accumulation allows pericardial stretch

• Pulsus paradoxus — how to measure: inflate BP cuff above systolic; deflate slowly; note SBP when Korotkoff sounds heard only during expiration (A); continue deflating until heard throughout respiratory cycle (B); difference A–B = pulsus paradoxus; >10 mmHg = tamponade physiology; >25 mmHg = severe; also present in: massive PE, severe COPD/asthma, tension pneumothorax (but echo distinguishes)

• Electrical alternans — highly specific for tamponade: beat-to-beat alternation in QRS amplitude and axis caused by swinging motion of heart in large effusion; when present with tachycardia = very high probability of tamponade physiology; do not wait for Beck triad if electrical alternans + tachycardia on ECG → echo immediately

• Myxedema effusion — large but no tamponade: hypothyroid effusions accumulate slowly over weeks to months; pericardium adapts by stretching → very large effusion without tamponade physiology despite large size; diagnose with TSH >10; treat with levothyroxine (Synthroid) — effusion resolves over weeks to months; pericardiocentesis usually not needed unless rapid accumulation occurs

• Pericardial fluid ADA >40 U/L = TB until proven otherwise: adenosine deaminase >40 U/L in pericardial fluid has sensitivity 87% and specificity 89% for TB pericarditis; always send ADA on pericardial fluid in any patient with risk factors (endemic country, HIV, immigrant); TB pericarditis → RIPE therapy + prednisolone (Deltasone) 60 mg PO daily ×6 weeks (↓constrictive pericarditis risk which develops in up to 50% without steroids)

• Common mistake — not leaving a drain after pericardiocentesis: aspirating and removing needle without leaving a drain → reaccumulation within hours (especially malignant and inflammatory effusions); always place a pigtail catheter and leave until output <25–50 mL/24h; drain placement is standard of care for all therapeutic pericardiocentesis