Pericardiocentesis is a procedure in which a syringe and needle are passed through the chest wall and into the pericardial space in order to aspirate fluid. Pericardiocentesis has the potential to save someone's life, particularly in a situation of cardiovascular extremis resulting from tamponade. It also has the ability to kill, and therefore should not be undertaken lightly or without undue thought to the potential risks and harms associated with it. Indeed, blind pericardiocentesis (i.e. without ultrasound or CT guidance) carries a 10% mortality rate and a 50% morbidity rate.