]> 2026-07-31T09:41:41+00:00 WBR0214 0 en Inappropriate ADH secretion '''Incorrect'''-Polyuria and polydipsia are not features of SIADH although it results in hyponatremia. Besides low serum osmolality, they have inappropriately high urine osmolality. Medication side effect Osmotic diuresis Psychogenic polydipsia '''Correct'''-Self-induced water intoxication should always be considered in the differential diagnosis of confusional states and seizures in schizophrenic patients. As many as 20% of patients with a diagnosis of schizophrenia drink excessive amounts of water. At least 4% of these patients suffer from chronic hyponatremia and recurrent acute water intoxication. They typically have low plasma and urine osmolality. Central diabetes insipidus '''Incorrect'''-Diabetes insipidus will present with excretion of dilute urine and elevated serum osmolality. Community Medical Health Center Primary Care Office Vendhan Ramanujam A 58 year old man who was diagnosed with schizophrenia in his early twenties is found wandering around his halfway house confused and disoriented. He is rushed to a local emergency room, where his serum sodium concentration is found to be 123 meq/L (Normal 135 mEq/L to 145 mEq/L). His urine sodium concentration is 5 meq/L (Normal >20 mEq/L). The patient was being treated with risperidone 4 mg per day for the past 3 years. He had been compliant with the medication and had good control over his symptoms. His roommate reports that the patient makes many trips to the nearby water cooler and often complains of being thirsty. What is the most likely cause of this patient’s metabolic disturbance? D Endocrine Electrolytes 2020-10-27T23:47:35Z 2459150.4913773 WBR0214