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Desmopressin (1-deamino-8-D-arginine vasopressin) is a synthetic form of the normal human hormone arginine vasopressin (the antidiuretic hormone, or ADH), a peptide containing nine amino acids. Compared to vasopressin, desmopressin's first amino acid has been deaminated , and the arginine at the eighth position is in the dextro rather than the ...
Vasopressin agonists are used therapeutically in various conditions, and its long-acting synthetic analogue desmopressin is used in conditions featuring low vasopressin secretion, as well as for control of bleeding (in some forms of von Willebrand disease and in mild haemophilia A) and in extreme cases of bedwetting by children.
The water deprivation test (WDT) is a commonly used test for diabetes insipidus, a two-step process involving parenteral desmopressin administration after an initial 8-hour water fast. It differentiates primary polydipsia from diabetes insipidus and central diabetes insipidus from nephrogenic diabetes insipidus .
Sometimes measuring blood levels of ADH (a synonym for vasopressin) during this test is also necessary. [citation needed] If there is 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.
Diagnostic tests for primary polydipsia usually involves the fluid deprivation test to exclude ADH problems. The desmopressin test is also used, in which the synthetic hormone is used as a diagnostic workup to test for inappropriate secretion of vasopressin, as seen in DI and SIADH.
Sometimes measuring blood levels of ADH toward the end of this test is also necessary, but is more time-consuming to perform. [18] To distinguish between the main forms, desmopressin stimulation is also used; desmopressin can be taken by injection, a nasal spray, or a tablet. While taking desmopressin, a person should drink fluids or water only ...
Vasopressin analogues are synthetic peptides structurally and functionally similar to arginine vasopressin (AVP), a naturally occurring hormone in mammals. These compounds have been developed to target specific vasopressin receptors (V1, V2, and V3) with varying affinities, allowing for more tailored therapeutic applications. These analogues ...
Desmopressin can also be used; if the patient is able to concentrate urine following administration of desmopressin, then the cause of the diabetes insipidus is neurogenic diabetes insipidus; if no response occurs to desmopressin, then the cause is likely to be nephrogenic.
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