disorders of thirst Flashcards
What controls thirst?
hypothalamas
What stimulates thirst
cellular dehydration or decrease in overall ECF
What is hypodipsia?
decrease in the ability to sense thirst
What is polydipsia?
increase in thirst; abnormal if it results in excessive water intake
Where is the Antidiuretic Hormones secreted?
the posterior pituitary
What does the Antidiuretic Hormone control?
the reabsorption of water by the kidneys by acting on vasopresin receptor in kidneys
Prouction of ADH is affected by ___ volume and ____
ECF volume and osmolality
What is Diabetes Insipidus?
the deficiency of ADH or reduced response of kidneys to ADH
Diabetic Insipidus results in inability to ____ ____
concentrate urine
What are the manifestations of Diabetes Insipidus?
- polyuria
- polydipsia
- possible FVD if cannot
access enough fluids
What is the treatment for Diabetes Insipidus?
vasopressin
What is the possible complication of Diabetes Insipidus?
acute renal failure
What happens during Syndrome of Inappropriate ADH?
ADH is released even though serum osmolality is reduced
What is the result of SIADH?
water retention and dilutional hyponatremia
Explain the two complications of SIADH
- Fluid overload (can be from surgery, trauma, usually from hospital)
- Heart failure
