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This patient does not undergo a water deprivation test
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.
Just wondering why it in not resistance to ADH action of vasopressin
because he would be hypernatremic with no ADH. can't resorb any water
low osm/urine, low os/plasma => psychogenic polydipsia