The nurse is caring for a patient who suffered a head trauma following a fall. The patient's heart rate is 112 beats/min and blood pressure is 88/50 mm Hg. The patient has poor skin turgor and dry mucous membranes
The patient is confused and restless. The following laboratory values are reported: serum sodium is 115 mEq/L; blood urea nitrogen (BUN) 50 mg/dL; and creatinine 1.8 mg/dL. The findings are consistent with which disorder? a. Cerebral salt wasting
b. Diabetes insipidus
c. Syndrome of inappropriate secretion of antidiuretic hormone
d. Thyroid storm
A
Cerebral salt wasting may occur after head trauma and is characterized by low sodium in the face of classic physical and laboratory signs of fluid volume deficit or dehydration, including tachycardia, hypotension, dry mucous membranes, weight loss, and poor skin turgor. The patient also may experience the classic signs of hyponatremia, including a serum sodium less than 135 mg/dL, confusion, lethargy, seizures, and coma. Diabetes insipidus is characterized by clinical signs of dehydration with elevated serum sodium. SIADH is characterized by hyponatremia and fluid volume overload. Thyroid storm would not directly affect sodium levels.
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