Which of the Following Is a Potential Complication of Untreated SIADH

Mr. Santos, a 55-year-old Male, Was Admitted to the Hospital with Complaints of Confusion, Headache and Nausea. Laboratory Results Revealed Hyponatremia and Low Serum Osmolality. Further Assessment Revealed Decreased Urine Output and Concentrated Urine. Mr. Santos Was Diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH)