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The American Diabetes Association defines the following criteria for the diagnosis of diabetes: a HbA1c of 6.5%, an 8-hour fasting blood glucose of 7.0 mmol/L (126 mg/dL), a 2-hour oral glucose tolerance test (OGTT) of ≥ 11.1 mmol/L (200 mg/dL), or in patients exhibiting hyperglycemic symptoms, a random plasma glucose of ≥ 11.1 mmol/L (200 mg/dL).
As a diagnosis of exclusion, a diagnosis of primary polydipsia may be the result of elimination of the possibility of diseases causing similar signs and symptoms, such as diabetes insipidus. [ 12 ] Diagnosis may be complicated by the fact that chronic and extreme compulsive drinking may impair the response of the kidneys to vasopressin , thus ...
Application of this name to DI arose from the fact that diabetes insipidus does not cause glycosuria (excretion of glucose into the urine). In a large survey conducted amongst patients with central diabetes insipidus, the majority were in favor of changing the disease's name to "vasopressin deficiency" to avoid confusion with diabetes mellitus. [6]
Polydipsia can be characteristic of diabetes mellitus, often as an initial symptom. It is observed in cases of poorly controlled diabetes, which is sometimes the result of low patient adherence to anti-diabetic medication. [1] Diabetes insipidus ("tasteless" diabetes, as opposed to diabetes mellitus) can also cause polydipsia. [1]
Wolfram syndrome, also called DIDMOAD (diabetes insipidus, diabetes mellitus, optic atrophy, and deafness), is a rare autosomal-recessive genetic disorder that causes childhood-onset diabetes mellitus, optic atrophy, and deafness as well as various other possible disorders including neurodegeneration.
In the absence of diabetes mellitus, the most common causes are the decreased secretion of aldosterone due to adrenal cortical tumor, primary polydipsia (excessive fluid drinking), central diabetes insipidus, and nephrogenic diabetes insipidus. [6] Polyuria may also be due to various chemical substances, such as diuretics, caffeine, and ethanol.
Central diabetes insipidus can be caused by various congenital or acquired lesions, and when the cause is unknown, it is classified as idiopathic. 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.
The causes of SIADH are commonly grouped into categories including: central nervous system diseases that directly stimulate the hypothalamus to release ADH, various cancers that synthesize and secrete ectopic ADH, various lung diseases, numerous drugs (carbamazepine, cyclophosphamide, SSRIs) that may stimulate the release of ADH, vasopressin ...