SODIUM HOMEOSTASIS
Hyponatremia
95-98% of total body Na is extracellular; Na accounts for
90% of extracellular osmolality
Requirements: 75 mEq or 3-4mEq/kg/d
For every increase of 100mg/dl in serum [glu] beyond
100mg/dl, serum [Na] falls about 1.6mEq/l