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Kaplan Qbank USMLE



Author5 Posts
  #1

A 57-year-old woman is receiving total parenteral nutrition and pre-operative radiotherapy for obstructive esophageal carcinoma. She becomes lethargic and demonstrates bizarre behavior. Urine output is 3400 mL/24 hours. To determine the cause, the most useful test would be <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />



1) lumbar puncture.

2) computed tomography scan of brain.

3) urine/serum creatinine ratio.

4) liver enzymes.

5) blood glucose.


  #2

blood glucose.

  #3

blood glucose

  #4

could you pls explain?

thanks


  #5

Let's dissect this question and ask WHY ????? WHY ????????

An esophegeal carcinoma patient= must be starving, nothing to eat

pre-radiation= ready for syrgery and poor intake

TPN= high solute, hyperglycemia TPN means a lot of highly concentrated nutients

3400 ml/24 hour urine output= a lot of water get out along with some solutes

patient is pouring out large amount of urine (3400 ml of water with a lot of sodium)

Electrolytesimbalance which one?

A sudden shift of electrolyes and water causes what ? hahahh Think

Hyperglycemia cause pseudohyponatremia

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