diabetes%20insipidus
DIABETES INSIPIDUS
Diabetes insipidus is a polyuric disease characterized by excretion of a large volume of hypotonic urine and hypernatremia. It is due to the absence of antidiuretic hormone.
Central (hypothalamic or neurohypophyseal) diabetes insipidus is the inability to secrete & produce vasopressin in the neurohypophyseal system. It is due to damage to the pituitary gland & hypothalamus, may be due to diseases, head injuries, neurosurgery, infection or genetic or autoimmune disorders.
In nephrogenic diabetes insipidus, there is inappropriate renal response to vasopressin. Kidney function may be impaired by drugs & by chronic disorders like polycystic kidney disease, sickle cell disease, kidney failure, partial ureteral block, hypokalemia, hypocalcemia, low protein diet & genetic disorders.
Primary polydipsia have abnormal increase in fluid intake.
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