Hyponatremia in Alcoholism

Prevalence and Pathophysiology

Hyponatremia is common in patients with advanced cirrhosis from alcoholism, typically defined as serum sodium concentration lower than 130 mmol/L, though reductions below 135 mmol/L should also be considered clinically significant 1, 2
Characterized by expansion of extracellular fluid volume with ascites and edema, driven by non-osmotic hypersecretion of vasopressin (antidiuretic hormone) and enhanced proximal nephron sodium reabsorption 1, 2, 3, 4

Hyponatremia in alcoholics is associated with increased mortality and morbidity, neurological complications, reduced survival after liver transplantation, and increased risk of complications like spontaneous bacterial peritonitis, hepatorenal syndrome, and hepatic encephalopathy 1, 2, 4

For Hypovolemic Hyponatremia, plasma volume expansion with saline solution and correction of causative factors (e.g., discontinuation of diuretics) are recommended 1, 2, 6
For Hypervolemic Hyponatremia, attainment of negative water balance, fluid restriction (1-1.5 L/day) for serum sodium <125 mmol/L with neurologic symptoms, and caution with hypertonic sodium chloride are recommended 1, 2, 3, 7
Vaptans (V2-receptor antagonists) can improve serum sodium in 45-82% of cases but should only be used short-term, and albumin infusion may improve serum sodium concentration but requires further study 1, 5, 6

The American Association for the Study of Liver Diseases recommends treating hyponatremia when serum sodium is <130 mmol/L, with careful correction to avoid osmotic demyelination syndrome 1, 4