What would you do?

So imagine this clinical situation…

You just came on shift in the emergency department.  Your partner has just finished telling you about the COPD patient he had to intubate when the nurse for the patient  comes rushing out and says “somethings wrong doctor, come quick!”  Your partner quickly says “I’m out!”

You enter the room and find the “new” respiratory therapist at the bedside.  He tells you that the patient is increasingly hard to ventilate and the plateau pressures are very high.  What would be your immediate first step?