NBME Answers : missi19998's page

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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

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yotsubato This patient does not undergo a water deprivation test +12

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/ +7

missi19998 Just wondering why it in not resistance to ADH action of vasopressin +

amarousis because he would be hypernatremic with no ADH. can't resorb any water +1

minhphuongpnt07 low osm/urine, low os/plasma => psychogenic polydipsia +

benitezmena In this question the pt had a normal urine osm (80) a low urine osm would be <50mosmol/kg. +

euchromatin69 u world 212 +