Electrolyte Correction

Electrolyte correction carries significant iatrogenic risk when performed incorrectly. The NP must understand the pharmacokinetics of electrolyte replacement, safe correction rates, monitoring parameters, and complications of overcorrection or undercorrection. Hyponatremia correction safety: chronic hyponatremia (>48 hours) allows brain cells time to adapt by extruding organic osmolytes (glutamate, taurine, myo-inositol) to prevent cerebral edema; rapid correction removes water faster than osmolytes can be reaccumulated, causing osmotic stress that strips myelin from pontine and extrapontine neurons -- osmotic demyelination syndrome (ODS). The safe correction rate is ≤8-10 mEq/L per 24 hours; patients at highest ODS risk (alcoholism, malnutrition, hypokalemia, liver disease, Na <105) should be corrected at ≤6 mEq/L per 24 hours. If overcorrection occurs, desmopressin (DDAVP) 2 mcg IV can re-lower sodium by inducing water retention. Potassium replacement safety: IV potassium must never be administered as a bolus -- rapid infusion creates a transient hyperkalemic 'wave' at the cardiac conduction system that can cause fatal arrhythmia. Maximum peripheral IV rate is 10 mEq/hr in a maximum concentration of 40 mEq/L; higher rates (20-40 mEq/hr) require central venous access, ICU setting, and...