Question: Which client would a nurse consider the greatest risk for developing hypernatremia? Want Online Help? - A 52-year-old who is receiving 0.45% NaCl intravenously - A 76-year-old who developed the syndrome of inappropriate antidiuretic hormone secretion (SIADH) as a result of head trauma - A 63-year-old who has had watery diarrhea since traveling abroad - A 48-year-old who is admitted with a diagnosis of Addison disease