Pericarditis

Background

Etiology

1. Idiopathic (25-85%)
2. Infection (up to 20%, including viral, bacterial, TB)
3. Malignancy: heme, lung, breast
4. Uremia
5. Post radiation
6. Connective tissue dz
7. Drugs: procainamide, hydralaine, methyldopa, anticoagulants
8. Cardiac injury (can see up to weeks later): post MI, trauma, aortic dissection

Diagnosis

Clinical Features

1. Pleuritic chest pain
   1. Radiates to chest, back, left trapezius
   2. Diminishes w/ sitting up/leaning forward
2. SOB
   1. Esp if concommitant pleural effusion
3. Hypotension/extremis if tamponade
4. Fever
5. Friction rub

ECG

• ECG
  • Less reliable in post-MI pts and those w/ baseline ECG abnormalities
  • May see low voltage/alternans if effusion present
  • If early repol confounding interpretation check ST:T ratio
    • If (ST elev)/(T height) in V6 or I >0.25 likely pericarditis
  • Progression:
    • 1. Global concave up ST elev (esp V4-6, I, II) +/- PR depression (II, AVF, V4-6)
    • 2. ST to baseline, big T's, PR dep
    • 3. T wave flatten then inversion
    • 4. Return to baseline

Work-Up

1. ECG
2. Labs
   1. WBC, ESR, trop
3. CXR
   1. If increased cardiac silhouette seen consider effusion

DDX

MI	Pericarditis
no fever	fever pain varies w/motion
focal ST chgs	diffuse ST elev
reciprocal chgs	no reciprocal chgs
Q waves	no Q wave
+/- pulm edema	clear lungs
wall motion abn	nl wall motion

• CHF
• PE
• PTX
• Aortic dissection
• Pneumomediastinum
• pleuritis

Treatment

1. NSAIDS for viral/idiopathic
2. Recurrent - colchicine
3. Uremic - dialysis
4. Tamponade --> Pericardiocentesis

Disposition

1. Hospitalization is not necessary in most cases
2. Consider admission for:
   1. Subacute onset over weeks
   2. Fever >100.4
   3. Large effusion (echo-free space>20mm)
   4. Immunosupressed
   5. Anticoagulant use
   6. Failure to respond to NSAID Rx (>7dy)

Complications

1. Pericardial Effusion and Tamponade
2. Recurence
   1. Usually weeks to months after initial episode
   2. Management is same
3. Contrictive Pericarditis
   1. Restrictive picture with pericardial calcifications on CXR, thickened on TTE
   2. Rx with pericardial window

Source

Tintinalli, UpToDate