Fluid deprivation test no change in the water loss despite fluid deprivation, desmopressin may be administered to distinguish between the two types of diabetes insipidus which are central & nephrogenic diabetes insipidus. The time of deprivation may vary from 4 to 18 hours. The serum osmolality and urine osmolality are both measured in the test. The conditions can be distinguished in the following way: Fluid deprivation test A fluid or water deprivation test is a medical test which can be used to determine whether the patient has diabetes insipidus as opposed to other causes of polydipsia (a condition of excessive thirst that causes
Primary polydipsia attention and motor speed. Other areas with volume reductions (both white and grey matter) include: Signs and symptoms of psychogenic polydipsia include: The most common presenting symptom is tonic-clonic seizure, found in 80% of patients. Psychogenic polydipsia should be considered a life-threatening condition, since it has been known to cause severe hyponatraemia, leading to cardiac arrest, coma and cerebral oedema. It can also cause central pontine myelinolysis. Treatment for psychogenic polydipsia depends on severity and may involve behavioural and pharmacological modalities. If the patient presents with acute hyponatraemia (overhydration) caused by psychogenic polydipsia, treatment usually involves administration of intravenous hypertonic