Current considerations in syndrome of inappropriate secretion of antidiuretic hormone/syndrome of inappropriate antidiuresis

• Published in: Endocrinologia y nutricion Vol. 57 Suppl 2; p. 22
• Main Authors: Velasco Cano, M V, Runkle de la Vega, Isabelle
• Format: Journal Article
• Language: Spanish
• Published: Spain 01.05.2010
• Subjects: Aging - physiology; Aquaporin 2 - genetics; Arginine Vasopressin - physiology; Blood Volume; Brain Edema - etiology; Brain Edema - prevention & control; Combined Modality Therapy; Diagnosis, Differential; Digestive System Diseases - complications; Digestive System Diseases - physiopathology; Furosemide - therapeutic use; Hospitalization; Humans; Hyponatremia - drug therapy; Hyponatremia - etiology; Hyponatremia - therapy; Iatrogenic Disease; Inappropriate ADH Syndrome - classification; Inappropriate ADH Syndrome - diagnosis; Inappropriate ADH Syndrome - drug therapy; Inappropriate ADH Syndrome - epidemiology; Inappropriate ADH Syndrome - etiology; Inappropriate ADH Syndrome - physiopathology; Inappropriate ADH Syndrome - therapy; Mutation; Natriuresis; Neoplasms - complications; Neoplasms - physiopathology; Osmolar Concentration; Postoperative Complications - physiopathology; Receptors, Vasopressin - genetics; Saline Solution, Hypertonic - adverse effects; Saline Solution, Hypertonic - therapeutic use
• ISSN: 1579-2021
• DOI: 10.1016/S1575-0922(10)70019-X

The syndrome of inappropriate secretion of antidiuretic hormone (SIADH)/syndrome of inappropriate antidiuresis is characterized by a hypotonic hyponatremia, with an insufficiently diluted urine given the plasmatic hypoosmolality, in the absence of hypovolemia (with or without a third space), hypotension, renal or heart failure, cirrhosis of the liver, hypothyroidism, adrenal insufficiency, vomiting, or other non-osmotic stimuli of ADH secretion. The response of ADH to the infusion of hypertonic saline divides SIADH into 4 different types. In type D, there is no alteration in ADH secretion. Rather, the defect is the maintained permeability of kidney aquaporin-2 channels to water. Activating mutations of the V2 receptor have been identified. The most frequent cause of SIADH is the use of drugs that induce secretion of the hormone. Old age is per se a risk factor for its development. SIADH is underdiagnosed, and hospitalization often worsens the clinical situation, due to an iatrogenic excess in the use of oral and i.v. liquids, often hypotonic, together with a reduction in salt intake. Treatment is directed towards normalization of natremia when possible, together with the avoidance of both hyponatremic encephalopathy as well as the osmotic demyelinization syndrome. Cases of "appropriate" secretion of ADH with normovolemic hyponatremia and high mortality rates should be treated with the same urgency as SIADH--such is the case of post-surgical hyponatremia.