Signs And Symptoms Of Hyponatremia

Signs and symptoms of hyponatremia. In evaluating hyponatremic patients, it is important to assess whether or not the patient is symptomatic, because symptoms are a better determinant of therapy than the absolute value itself. Most patients with serum sodium values above 125 mEq/L are asymptomatic. The rapidity with which hyponatremia develops is critical in the initial evaluation of such patients. In the range of 125 to 130 mEq/L, the predominant symptoms are gastrointestinal ones, including nausea and vomiting. Neuropsychiatric symptoms dominate the picture once the serum sodium level drops below 125 mEq/L, mostly because of cerebral edema secondary to hypotonicity. These include headache, lethargy, reversible ataxia, psychosis, seizures, and coma. Severe manifestations of cerebral edema include increased intracerebral pressure, tentorial herniation, respiratory depression and death. Hyponatremia-induced cerebral edema occurs principally with rapid development of hyponatremia, typically in patients managed with hypotonic fluids in the postoperative setting or those receiving diuretics, as discussed previously. The mortality rate can be as great as 50%. Fortunately, this rarely occurs. Nevertheless, neurologic symptoms in a hyponatremic patient call for prompt and immediate attention and treatment [16,17].

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Normonatremia

Acute hyponatremia

Chronic hyponatremia

Normonatremia

Acute hyponatremia

Chronic hyponatremia

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