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Medicine

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Endocrine

Question
4 out of 9
 

A 33 year old lady presents with polydipsia and polyuria. Her symptoms started soon after a road traffic accident 6 months ago. The blood pressure is 120/80 mm Hg with no postural drop. The daily urinary output is 6-8 liters. Investigation showed, Na 130 mEq/L, K.3.5 mEq/L, urea 15 mg/dL, sugar-65 mg/dL. The plasma osmolality is 268 mosmol/L and urine osmolality.45 mosmol/L. The most likely diagnosis is: (AIIMS Nov 2010)



A Central diabetes insipidus.

B Nephrogenic diabetes insipidus.

C Resolving acute tubular necrosis.

D Psychogenic polydipsia.

Ans. D

Psychogenic polydipsia.

In this case her BP is normal, there is mild hyponatremia (Na=130), serum potassium, blood sugar and blood urea are normal. Plasma osmolality is slightly reduce (268) but urine osmolality is highly reduced. So option D is the best answer.

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