The nurse admitted a client with Pneumonia. The client is on…

The nurse admitted a client with Pneumonia. The client is on a nasal cannula at 4L/min.  The client is rapidly declining into Acute Respiratory Distress Syndrome (ARDS).   The client’s respirations were at 40 breaths per minute and now are at 8 breaths per minute. The client appears fatigue and pale. SpO2 82%.  Which arterial blood gas alteration is expected with the client’s current respirations?