An ABG was obtained from a patient on CMV with continuous ca…

An ABG was obtained from a patient on CMV with continuous capnometer connected to the ventilatory circuit. The following ABG results and capnometer reading are as follows: pH – 7.35 PaCO2 – 50 mmHg PaO2 – 65 mmHg HCO3 – 25 mEq/L PETCO2 – 45 mmHg Four hours later the capnometer is reading at 60 mmHg. what is the actual PaCO2?