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Antidiuretic hormone (ADH) is released from the posterior pituitary for a number of physiologic reasons. The majority of people with hyponatremia, other than those with excessive water intake or renal salt wasting, will have elevated ADH as the cause of their hyponatremia. However, not every person with hyponatremia and elevated ADH has SIADH.
In general, hyponatremia is usually asymptomatic until severe. [10] Typical laboratory findings for tea and toast syndrome include a low serum osmolality (hypotonicity) with normal urine osmolality since antidiuretic hormone levels are normal. A common laboratory finding for the tea and toast phenomenon is manifestation as hyponatremia.
The cornerstone of therapy for SIADH is reduction of water intake. If hyponatremia persists, then demeclocycline (an antibiotic with the side effect of inhibiting ADH) can be used. SIADH can also be treated with specific antagonists of the ADH receptors, such as conivaptan or tolvaptan. [citation needed] Another cause is psychogenic polydipsia. [3]
The causes of and treatments for hyponatremia can only be understood by having a grasp of the size of the body fluid compartments and subcompartments and their regulation; how under normal circumstances the body is able to maintain the sodium concentration within a narrow range (homeostasis of body fluid osmolality); conditions can cause that ...
Non-psychogenic – another non-psychological cause, including idiopathic (unknown cause) The terms primary polydipsia and psychogenic polydipsia are sometimes incorrectly used interchangeably – to be considered psychogenic, the patient needs to have some other psychiatric symptoms, such as delusions involving fluid intake or other unusual ...
In 1953, Leaf et al., demonstrated that exogenous administration of the antidiuretic hormone vasopressin resulted in hyponatremia and a natriuresis dependent on water retention and weight gain. This was not "salt wasting"; it was a physiologic response to an expanded intravascular volume.
The Mayo Clinic diet, a program that adheres to this notion, was developed by medical professionals based on scientific research, so you can trust that this program is based on science, and not ...
Hyponatremia is the most common electrolyte abnormality during acute attacks, occurring in 40% of patients and presenting as SIADH. [13] Hypomagnesemia is also common. There are no pathognomonic signs or symptoms. [citation needed] The most common identified triggers for acute attacks are medications, weight loss diets, and surgery. [14]