All of the following are causes of hypovolemic hyponatremia lead to urine sodium > 20 except?: (A) Renal losses, (B) Vomiting, (C) Cerebral salt wasting syndrome, (D) Mineralocoicoid deficiency
Answer is B. OPTION B - Vomiting It will induce dehydration and lead to renal conservation of salt and water . OPTION A - Renal Losses Tubular damage explains salt wasting and high urine sodium. OPTION C - Cerebral salt wasting syndrome Release of BNP will promote natriuresis and salt wasting . OPTION D - Mineralocoicoid deficiency Aldosterone deficiency will also cause salt wasting .