Hyponatremia Management

Introduction to Hyponatremia

The European Society of Gastroenterology recommends discontinuation of diuretics and expansion of plasma volume with normal saline in hypovolemic hyponatremia, and fluid restriction for hypervolemic hyponatremia with severe sodium levels (<125 mmol/L) 1
The European Association for the Study of the Liver recommends hypertonic sodium chloride (3%) administration reserved for severely symptomatic acute hyponatremia, and careful correction of serum sodium to avoid central pontine myelinolysis (no more than 8 mmol/L per day) 1, 2

Diuretics, particularly thiazides, are responsible for 94% of severe diuretic-induced hyponatremia, according to the American Heart Association 1, 3, 4
Psychotropic drugs, including antidepressants, have been associated with hyponatremia, as noted by the American Psychiatric Association 1
Anticonvulsants, such as carbamazepine, have been linked to hyponatremia, with a moderate level of evidence supporting this association, according to the American Academy of Neurology 1
Proton pump inhibitors, certain antibiotics, ACE inhibitors, and hypoglycemic agents may be potential causes of hyponatremia, although the strength of evidence is low, as recommended by the European Society of Gastroenterology 1

The National Kidney Foundation recommends measurement of serum sodium, serum osmolality, and urine osmolality when evaluating hyponatremia, with a high level of evidence supporting the importance of these measurements 5
A thorough medication review, focusing on known culprits, and assessment for underlying conditions such as heart failure, liver disease, and SIADH are suggested by the European Society of Cardiology, with a moderate level of evidence due to the complexity of these conditions 1, 2, 5, 6
Hyponatremia is commonly associated with diuretic therapy, heart failure, and liver cirrhosis, with up to one-third of heart failure patients experiencing hyponatremia due to neurohormonal activation, decreased effective circulating volume, comorbidities, and medication effects 3, 4

Treatment options for hyponatremia include water restriction, correction of underlying causes, and in severe cases with cognitive symptoms, vasopressin antagonists may be considered 6
The European Society of Gastroenterology and the European Association for the Study of the Liver recommend careful correction of serum sodium to avoid central pontine myelinolysis (no more than 8 mmol/L per day) 1, 2
When prescribing medications that may be associated with hyponatremia, such as dutasteride, monitor for known side effects and consider periodic assessment of metabolic parameters (glucose, lipids, liver enzymes) 7
If hyponatremia develops in a patient taking dutasteride, investigate other more likely causes such as diuretic use or underlying medical conditions 6