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However, if portion sizes are inadequate, a person may not be consuming enough protein and salt. When combined with excessive water intake, this results in insufficient solute concentration. Patients with poor kidney function, or low glomerular filtration rate, are at even higher risk of hyponatremia due to increased water retention. [2]
Some patients with hyponatremia have normal or slightly elevated blood volume. In those patients, the increased ADH activity and subsequent water retention may be due to "physiologic" causes of ADH release such as pain or nausea. [citation needed] Alternatively, they may have the Syndrome of Inappropriate ADH .
Hyponatremia or hyponatraemia is a low concentration of sodium in the blood. [4] It is generally defined as a sodium concentration of less than 135 mmol/L (135 mEq/L), with severe hyponatremia being below 120 mEq/L. [3] [8] Symptoms can be absent, mild or severe.
A fluid restriction diet is generally medically advised for patients with "heart problems, renal disease, liver damage including cirrhosis, endocrine and adrenal gland issues, elevated stress hormones and hyponatremia". [1] Patients with heart failure are recommended to restrict fluid intake down to 2 quarts per day. [2]
Patients with extra-renal salt losses complicated by hyponatremia were found to be common-place, and consistent with McCance's description, they excreted urine virtually free of sodium. [22] In 1950, Sims et al, published their work that suggest observed relation between hyponatremia and pulmonary tuberculosis.
Tobacco smoking is an often overlooked factor linked to hyponatremia, due to the ADH-releasing effect of nicotine, although this is usually limited to heavy smokers. [21] One study suggested that around 70% of patients with self-induced polydipsia were tobacco smokers. [22]
It is generally defined as a concentration lower than 135 mEq/L. [3] This relatively common electrolyte disorder can indicate the presence of a disease process, but in the hospital setting is more often due to administration of Hypotonic fluids. [14] [3] The majority of hospitalized patients only experience mild hyponatremia, with levels above ...
Because this could be a chronic condition, low sodium may be normal for the patient, so an especially careful correction is warranted. It is also very important to note that due to the normal kidney function, and lack of other intrinsic or toxic cause of the electrolyte disturbance, restoration of dietary solutes will correct the electrolytes ...