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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.
If the levels of an electrolyte are too low, a common response to electrolyte imbalance may be to prescribe supplementation. However, if the electrolyte involved is sodium, the issue is often water excess rather than sodium deficiency. Supplementation for these people may correct the electrolyte imbalance but at the expense of volume overload.
High sodium consumption (5 g or more of salt per day) and insufficient potassium intake (less than 3.5 grams (0.12 oz) per day) have been linked to high blood pressure and increased risk of heart disease, stroke, and kidney disease. [6] [7] As an essential nutrient, sodium is involved in numerous cellular and organ functions. Several national ...
Low levels of sodium in your blood can lead to sodium deficiency called hyponatremia, which is very rare. Symptoms of low sodium levels include nausea, vomiting, cramps, headaches, confusion, and ...
“A normal blood sodium level is between 135 and 145 milliequivalents per liter (mEq/L). ... Symptoms of hyponatremia include nausea and vomiting, confusion, restlessness, headache, seizures, and ...
Hypoaldosteronism causes low sodium (hyponatremia), high potassium (hyperkalemia), and metabolic acidosis, a condition in which the body produces excess acid.These conditions are responsible for the symptoms of hypoaldosteronism, which include muscle weakness, nausea, palpitations, irregular heartbeat, and abnormal blood pressure.
Sodium is also important in regulating the amount of water that passes through the blood–brain barrier. Decreased sodium blood levels result in increased permeability of water across the blood–brain barrier. [8] This increased influx of water causes brain swelling which leads to severe neurological symptoms. [8]
The neuromuscular symptoms of hypocalcemia are caused by a positive bathmotropic effect (i.e. increased responsiveness) due to the decreased interaction of calcium with sodium channels. Since calcium blocks sodium channels and inhibits depolarization of nerve and muscle fibers, reduced calcium lowers the threshold for depolarization. [7]