Antidiuretic hormone (ADH), or vasopressin, is a substance produced naturally by the hypothalamus and released by the pituitary gland. The hormone controls the amount of water your body removes.
Ectopic ADH secretion is the release of ADH from an abnormal location within the body. Ectopic means "out of place."
Alternative NamesSIADH; Syndrome of inappropriate antidiuretic hormone secretion
Causes, incidence, and risk factorsThe most common cause of ectopic ADH secretion is cancer. Certain lung cancers, as well as some head and neck tumors, are the most common cancers that cause this problem. In rare cases, many other tumors may cause ectopic ADH secretion.
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SymptomsThe abnormal release of ADH makes it harder for the body to remove water. Fluid builds up in the body. Low blood sodium levels (hyponatremia) can occur.
Often, there are no symptoms from low sodium levels. However, changes in mental status and even seizures may occur.
TreatmentTreatment is aimed at removing the cause of the problem (for example, surgery to remove a tumor producing ADH).
Limiting fluid intake is another common treatment. This helps prevent excess water from building up in the body.
Patients in the hospital with ectopic ADH that does not respond to other treatments may be given tolvaptan by mouth (orally) and conivaptan through a vein (intravenous). These treatments block the effects of ADH.
ReferencesLin M, Liu SJ, Lim IT. Disorders of water imbalance. Emerg Med Clin North Am. 2005;23(3):749-770.
Gagel RF. Endocrine manifestations of tumors: "ectopic" hormone production. In: Goldman L, Ausiello D, eds. Cecil Medicine. Philadelphia, PA: Saunders; 2007:chap 188.
Alcohol can inhibit the secretion of antidiuretic hormone (ADH), also known as vasopressin. ADH is produced in the hypothalamus and helps regulate the balance of water and electrolytes in the body by controlling water reabsorption in the kidneys.
Diabetes insipidus
Diabetes insipidus
ADH secretion is stimulated by factors such as dehydration, high blood osmolality, low blood pressure, and stress. These conditions trigger the hypothalamus to release ADH from the posterior pituitary gland to help regulate water balance in the body.
Changes in blood osmotic pressure would most affect the secretion of antidiuretic hormone (ADH) by the pituitary gland. ADH helps regulate the concentration of urine by increasing water reabsorption in the kidneys, and its secretion is influenced by blood osmotic pressure to maintain water balance in the body.
The neurohypophyseal secretion of ADH (antidiuretic hormone) promotes water reabsorption in the kidneys, leading to the formation of concentrated urine. ADH acts on the collecting ducts of the nephrons in the kidneys to increase their permeability to water, allowing the body to conserve water and produce concentrated urine.
Alcohol (ethanol) acts on the hypothalamus to inhibit ADH secretion. This leads to diuresis and the typical repeated trips to the bathroom while at the bar drinking.
ADH (antidiuretic hormone) is a hormone released by the pituitary gland that helps regulate water balance in the body by controlling the reabsorption of water in the kidneys. Its secretion is controlled by negative feedback, where rising blood osmolarity or a decrease in blood volume triggers release of ADH to help conserve water and decrease urine output, while decreasing blood osmolarity or an increase in blood volume suppresses ADH secretion.
Hypo-secretion of antidiuretic hormone (ADH) can be caused by conditions such as diabetes insipidus, which may be due to damage to the hypothalamus or pituitary gland, leading to decreased production or release of ADH. Other causes could include tumors, head injuries, or certain medications affecting the function of the pituitary gland.
Factors that increase the secretion of antidiuretic hormone (ADH) include dehydration, pain, stress, certain medications, and low blood pressure. ADH helps the body conserve water by reducing urine output when these factors are present.
The secretion of antidiuretic hormone is inhibited by both alcohol and caffeine. I'm trying to learn at what level (pituitary, where the actual secretion occurs) or the hypothalamus where ADH (vasopressin) is produced.
An increase in in blood alcohol level will, if high enough, reduce the secretion of anti diuretic hormone (ADH), witch will in turn effect the kidneys ability to reasorb water in the tubules.