Avoid positive pressure ventilation b/c it can further impair cardiac filling (Circ 2006;113:1622)
Pericardiocentesis (except if due to aortic/myocardial rupture, for which emergent surgery is treatment of choice; if too unstable, consider small pericardiocentesis to prevent PEA)
Surgical drainage considered if fluid rapidly reaccumulates, loculated, or hemorrhagic