Hypernatremia quiz

Following surgery to remove a pituitary adenoma, a patient develops increased urine output and his sodium starts to rise. The surgical team starts D5W and shortly afterwards the urine output falls and the serum sodium along with it. The team concludes that the D5W must have been nephrotoxic and stops the D5W. Soon after the urine output increases as does the serum sodium. You are asked to review their case report of D5W induced renal failure. Which of the following is likely not true about the preceding case report?

Choose one

The decrease in urine output was mediated by pre-made ADH being released by the injured posterior pituitary gland.

The increased urine output initially was due to central DI but the increased urine output at the end was due to nephrogenic DI.

The fall in sodium was ADH dependent.

The D5W was not the cause of the decrease in urine output.

This is an example of the triphasic response to pituitary surgery.

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