Presentation of Case A 68-year-old woman was admitted to the hospital because of diarrhea. One year earlier she came to this hospital because of episodes of weakness and was found to have ventricular irritability with runs of ventricular tachycardia that required lidocaine, procainamide, phenytoin sodium, propranolol and potassium chloride infusions for control. The urea nitrogen was 10 mg, and the glucose 105 mg per 100 ml. The sodium was 145 meq, the potassium 1.4 meq, the chloride 94 meq, and the carbon dioxide 31 meq per liter. A specimen of arterial blood, drawn while the patient was breathing room air,.
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