nbme20/Block 3/Question#38
A 23-year-old man with a 3-year history of ...
Psychogenic polydipsia
yotsubato
This patient does not undergo a water deprivation test
+3 2019-06-10T11:08:20Z
niboonsh
Compulsive water drinking or psychogenic polydipsia is now increasingly seen in psychiatric populations. Effects of increased water intake can lead to hyponatremia causing symptoms of nausea, vomiting, seizures, delirium and can even be life threatening if not recognized and managed early.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5579464/
+ 2019-06-16T15:51:03Z
submitted by masonkingcobra(25), 2019-05-23T22:44:19Z
In psychogenic polydipsia, serum sodium is low, and after water deprivation test, urine osmolality is increased. Urine osmolality does not increase with vasopressin injection
In nephrogenic diabetes insipidus, serum sodium is high and there is no change/mild increase in urine osmolality after water deprivation