Going to be a nurse? Then one important part of your nursing responsibilities involves doing a daily check of the code blue cart or crash cart. The crash cart is checked every shift for emergency items and function. In this how-to video we review the nurse's responsibility to test the defibrillator oxygen tank, most hospitals change tanks at 500 or 1000 psi. Follow along an see how simple it is to do a daily check of the code blue cart.