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# Normal Saline (0.9% Sodium Chloride) ## Overview Normal Saline (NS) is an isotonic crystalloid solution containing 154 mEq/L of sodium and 154 mEq/L of chloride. It is the most commonly used intravenous fluid for resuscitation and maintenance. ## Primary Indications * Extracellular fluid replacement (hypovolemia, shock, dehydration). * Metabolic alkalosis with volume depletion. * Sodium depletion. * Vehicle for intravenous medication administration. * Wound irrigation/device flushing. ## Adult Dosing * **Hypovolemia/Resuscitation:** Typically 500 mL to 1000 mL boluses, titrated to clinical response (e.g., blood pressure, heart rate, urine output). * **Maintenance:** Generally 75–125 mL/hr, depending on patient weight and clinical status. * *Note: Specific rates for resuscitation vary significantly by clinical protocol (e.g., Sepsis bundles, trauma protocols).* ## Pediatric Dosing * **Resuscitation:** 20 mL/kg IV bolus over 5–20 minutes. May repeat as necessary based on clinical assessment of perfusion. * **Maintenance:** Calculated via Holliday-Segar method: * 100 mL/kg for first 10 kg * 50 mL/kg for next 10 kg * 20 mL/kg for each kg > 20 kg * *Divide total daily volume by 24 for hourly rate.* ## Dose Adjustments * **Renal/Hepatic/Cardiac:** Reduce or avoid large volumes in patients with heart failure or severe renal impairment due to risk of volume overload and pulmonary edema. * **Hypernatremia:** Use caution or switch to hypotonic solutions (e.g., 0.45% NaCl) if hypernatremia occurs. ## Contraindications * Hypernatremia. * Hyperchloremia. * Fluid overload (e.g., congestive heart failure, severe renal failure with oliguria). ## Adverse Effects * **Hyperchloremic metabolic acidosis:** Common with large volume resuscitation due to the high chloride content (154 mEq/L compared to physiological serum chloride ~100 mEq/L). * Volume overload (pulmonary edema, peripheral edema). * Hypokalemia (dilutional). ## Key Drug Interactions * **Incompatibility:** Known to be incompatible with certain medications; always verify Y-site compatibility before co-administration. * **Corticosteroids:** Use with caution as sodium retention may be exacerbated. ## Monitoring * **Volume status:** Assess for signs of fluid overload (crackles, elevated JVP, edema). * **Electrolytes:** Monitor serum sodium and chloride periodically during long-term or high-volume administration. * **Acid-base status:** Monitor for hyperchloremic acidosis via arterial/venous blood gas or metabolic panel. ## Clinical Pearls * **Chloride Load:** In large-volume resuscitation, consider balanced crystalloids (e.g., Lactated Ringer’s or Plasma-Lyte) to lower the risk of hyperchloremic metabolic acidosis and potential acute kidney injury. * **Tonicity:** NS is isotonic to plasma but "physiologically" non-physiologic due to the supra-physiological chloride content. * **Documentation:** Always specify the fluid type and the rate of infusion in the medication order to prevent unauthorized rapid infusions. *** *Disclaimer: This information is for educational purposes only. Clinical protocols vary by institution. Always verify current prescribing information, institutional guidelines, and compatibility tables before administration.*