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# Normal Saline (0.9% Sodium Chloride) ## Overview Normal Saline (NS) is an isotonic crystalloid solution containing 154 mEq/L each of sodium and chloride. It is the most commonly used intravenous fluid for volume resuscitation and maintenance. ## Primary Indications * Hypovolemia and shock (resuscitation). * Maintenance fluid therapy. * Hypercalcemia (to promote calciuresis). * Metabolic alkalosis. * Vehicle for medication administration (IV piggyback). * Wound/device irrigation. ## Adult Dosing * **Resuscitation:** Typically 500 mL to 1,000 mL boluses, titrated to clinical response (blood pressure, heart rate, urine output). * **Maintenance:** Generally 75–125 mL/hour; however, "maintenance" dosing is highly dependent on institutional protocol, patient weight, and ongoing losses. * **Hypercalcemia:** Often 200–500 mL/hour depending on cardiovascular status. ## Pediatric Dosing * **Resuscitation:** 20 mL/kg bolus administered rapidly (over 5–20 minutes). May repeat as needed based on clinical status (e.g., hemodynamic stability, perfusion). * **Maintenance (Holliday-Segar Method):** * 100 mL/kg/day for the first 10 kg. * 50 mL/kg/day for the next 10 kg. * 20 mL/kg/day for weight >20 kg. * *Note: Maintenance rates are adjusted based on serum electrolytes and urine output.* ## Dose Adjustments Requires caution and individualized titration in: * Renal impairment (risk of fluid overload). * Heart failure (risk of pulmonary edema). * Severe hepatic impairment (risk of ascites/edema). * Elderly patients (reduced renal/cardiac reserve). ## Contraindications * Hypernatremia. * Hyperchloremic metabolic acidosis (high volumes may exacerbate acidosis due to strong ion difference reduction). * Conditions where sodium or chloride retention is hazardous (e.g., severe edema, severe hypertension). ## Adverse Effects * Hyperchloremic metabolic acidosis (with large volume administration). * Fluid overload/pulmonary edema. * Peripheral edema. * Dilutional coagulopathy (associated with massive resuscitation). * Electrolyte disturbances (e.g., hypernatremia). ## Key Drug Interactions * **Incompatibility:** Physically incompatible with certain drugs (e.g., phenytoin, diazepam). Always check compatibility charts before y-site administration. * **Corticosteroids/NSAIDS:** May promote sodium retention when administered concurrently. ## Monitoring * **Volume status:** Assess heart rate, blood pressure, peripheral edema, lung sounds (crackles), and urine output. * **Laboratory:** Serum electrolytes (Na, Cl, K), arterial blood gases (pH, bicarbonate), and serum creatinine/BUN. * **In pediatric patients:** Monitor weights, intake/output, and signs of cerebral edema if correcting sodium abnormalities. ## Clinical Pearls * **Hyperchloremic Acidosis:** Rapid infusion of large volumes of NS can cause a drop in pH due to the high chloride content (154 mEq/L vs. plasma ~100 mEq/L). Consider balanced salt solutions (e.g., Lactated Ringer’s or Plasma-Lyte) for large volume resuscitation. * **Not a Buffer:** NS does not contain lactate or acetate and has no buffering capacity. * **Institutional Variation:** Always refer to your specific hospital’s fluid resuscitation protocol for patient-specific titration guidelines. *** *Disclaimer: This information is for educational purposes only. Clinical practice varies by institution and patient status. Always verify drug compatibility, current prescribing information, and local protocols before administration.*