A charge nurse agrees to cover another nurse's assignment during a lunch break. Based on the status report provided by the nurse who is leaving for lunch, which client should be checked first by the charge nurse?

B The client admitted yesterday with diabetic ketoacidosis whose blood glucose level is now 195 mg/dL (10.8 mmol/L). A The client post triple coronary bypass four days ago who has serosanguinous drainage in one chest tube. C The client with an ileal conduit created two days ago with a scant amount of blood in the drainage pouch. D The client with a pneumothorax secondary to a gunshot wound with a current pulse oximeter reading of 90%.