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Diabetes insipidus (DI) Internal medicine
Diabetes insipidus (DI) is a condition related to water balance and fluid regulation in the body. It is not to be confused with diabetes mellitus (the more common form of diabetes), which is related to blood sugar regulation. Diabetes insipidus is a disorder of the posterior pituitary gland or the hypothalamus, both of which play a crucial role in maintaining the body's water balance.
There are two main types of diabetes insipidus: central diabetes insipidus and nephrogenic diabetes insipidus.
Central Diabetes Insipidus (Neurogenic DI):
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This type is caused by a deficiency of the hormone vasopressin (also known as antidiuretic hormone or ADH) produced by the hypothalamus or released from the posterior pituitary gland. Vasopressin helps regulate the body's water balance by controlling the reabsorption of water in the kidneys.
A problem in the production, release, or function of vasopressin leads to excessive urination and an inability to concentrate urine, resulting in the excretion of large amounts of diluted urine.
Central DI can be caused by various factors, including head injuries, tumors, infections, autoimmune diseases affecting the hypothalamus or pituitary, and sometimes it can be idiopathic (unknown cause).
Nephrogenic Diabetes Insipidus:
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This type is characterized by the kidneys' inability to respond to normal levels of vasopressin, even when the hormone is present in adequate amounts.
The kidney tubules do not properly reabsorb water, leading to the excretion of large volumes of dilute urine.
Nephrogenic DI can be caused by genetic factors, certain medications (e.g., lithium), kidney diseases, and electrolyte imbalances.
Diagnosis and management of diabetes insipidus are typically handled by internal medicine specialists or endocrinologists. The diagnosis involves a series of tests to measure urine output, concentration, and blood levels of vasopressin and other related hormones. Imaging studies like MRI may be used to identify structural issues in the brain or pituitary gland.
The treatment of diabetes insipidus depends on the type and underlying cause. For central DI, synthetic vasopressin or desmopressin (a synthetic ADH analogue) can be prescribed to replace the deficient hormone. In nephrogenic DI, treatment focuses on addressing the underlying cause and managing symptoms, often with dietary adjustments and certain medications to enhance kidney responsiveness to vasopressin.
Diabetes insipidus (DI) is a disorder in which polyuria due to decreased collecting tubule water reabsorption is induced by either decreased secretion of antidiuretic hormone (ADH) (central DI) or resistance to its renal effects (nephrogenic DI). In most patients, the degree of polyuria is primarily determined by the degree of ADH deficiency or resistance . Thus, the urine output may range from 2 L/day with mild partial DI to over 10 to 15 L/day in patients with severe disease.
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