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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 widely used for fluid resuscitation and maintenance in clinical settings. ## Primary Indications * Hypovolemia and fluid resuscitation. * Maintenance fluid therapy. * Diluent for IV medication administration. * Management of metabolic alkalosis (chloride-responsive). ## Adult Dosing * **Resuscitation:** Typically 500 mL to 1,000 mL boluses, titrated to clinical response (blood pressure, heart rate, urine output). * **Maintenance:** Generally 1–2 mL/kg/hour, adapted to patient weight and clinical status. * **Dosing note:** Specific rates depend entirely on local institutional protocols and the patient's underlying pathology (e.g., sepsis vs. heart failure). ## Pediatric Dosing * **Resuscitation:** 20 mL/kg bolus via rapid infusion. Repeat based on reassessment of hemodynamic stability. * **Maintenance:** Use the Holliday-Segar formula (100 mL/kg for first 10 kg; 50 mL/kg for next 10 kg; 20 mL/kg for each kg >20 kg) over 24 hours. * **Dosing note:** Always verify weight-based calculations; monitor for fluid overload, especially in patients with cardiac or renal impairment. ## Dose Adjustments * **Renal/Hepatic/Cardiac Impairment:** Reduce volume and rate significantly. High-volume administration can lead to volume overload and hyperchloremic metabolic acidosis. ## Contraindications * Hypernatremia. * Hyperchloremia. * Fluid overload (e.g., decompensated heart failure, severe pulmonary edema). ## Adverse Effects * **Fluid Overload:** Edema, hypertension, congestive heart failure exacerbation. * **Metabolic:** Hyperchloremic metabolic acidosis (with large volume administration). * **Electrolyte Imbalances:** Hypernatremia, hypokalemia (due to dilution). * **Local:** Phlebitis or extravasation at the infusion site. ## Key Drug Interactions * **Incompatibility:** Avoid mixing with medications that may precipitate (e.g., amphotericin B usually requires D5W). Always check individual drug compatibility monographs. * **Corticosteroids:** May promote sodium and water retention. ## Monitoring * Monitor hemodynamics (BP, HR, perfusion). * Monitor intake and output (strict fluid balance). * Monitor electrolytes (sodium, chloride, potassium) and acid-base status (arterial or venous blood gas). * Monitor for signs of pulmonary edema (râles, dyspnea). ## Clinical Pearls * **Hyperchloremic Acidosis:** Normal saline has a chloride concentration (154 mEq/L) higher than plasma (approx. 98–107 mEq/L). Large volumes can cause "dilutional" or "hyperchloremic" metabolic acidosis. * **Alternative Fluids:** Balanced crystalloids (e.g., Lactated Ringer’s or Plasma-Lyte) may be preferred in patients with acidosis or trauma to reduce the risk of hyperchloremia. * **Compatibility:** NS is the default bedside diluent for many drugs, but verify compatibility for each specific IV push or piggyback medication. *** **Educational Disclaimer:** This information is for educational purposes only. Always verify doses, compatibility, and infusion rates with current institutional protocols, authoritative references (e.g., Lexicomp, Micromedex), and the patient's clinical status before administration.