A spontaneously breathing patient with an exacerbation of co…

A spontaneously breathing patient with an exacerbation of congestive heart failure is receiving an FIO2 of 0.40 and has the following arterial blood gas results:pH             7.46PCO2         33 torrPO2            48 torrHCO3-       23 mEq/LBE                 0 mEq/L