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riley.hively riley.hively
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6 years ago
The nurse caring for a lung cancer patient with metastasis to the brain suspects the patient has developed a paraneoplastic syndrome known as syndrome of inappropriate antidiuretic hormone (SIADH) secretion.
 
  Which laboratory result in this patient who has gained 3 lb in a day would alert the nurse to the possibility of SIADH?
  A)
  Serum potassium of 5.0 mmol/L
  B)
  Serum sodium of 115 mmol/L
  C)
  BUN of 8 mg/dL
  D)
  Hematocrit of 40
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#1
6 years ago
Ans:
B

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SIADH is the principal cause of hyponatremia in malignant disease. It may be caused by oat cell carcinoma of the lung and certain other malignant tumors or be due to the tumor producing vasopressin. The other lab values, K+, BUN, and hematocrit are all within normal adult ranges.
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