Technically relieve cardiac tamponade 同 Haemothorax就係搵野拮穿個membrane
依家乜都穿哂重點會有net positive pressure buildup causing obstruction
CO=HRxSV
當你massive bleeding 所有cardiac output 都流晒出嚟
就算HR 得60 同 SV得50
一分鐘都有3L blood loss
仲要未計一開始有sympathetic drive
CPR is for maintain cerebral perfusion
但冇血perfuse cpr都唔會幫到d咩
不過當場都真係得cpr可以做得