An alert older adult client with type 1 diabetes mellitus is admitted with a serum glucose of 420 mg/dL (23.31 mmol/L). As the nurse administers 10 units of regular insulin IV push (IVP), the client immediately begins to vomit. Which action should the nurse implement first? Reference Range: Blood Glucose [74 to 106 mg/dL (4.1 to 5.9 mmol/L)]