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# Normal Saline ## Overview Normal saline (0.9% sodium chloride) is an isotonic crystalloid intravenous fluid used for hydration and electrolyte replenishment. ## Primary Indications * Volume resuscitation in hypovolemia * Maintenance fluid therapy * Diluent for compatible intravenous medications ## Adult Dosing Dosing is highly variable and depends on clinical indication (e.g., maintenance, resuscitation, replacement). * **Maintenance:** Typically 1-2 L/day, administered at a rate of 75-125 mL/hr. * **Resuscitation:** Rapid infusion (e.g., 1-2 L bolus) may be administered, with subsequent doses based on clinical response. * **Replacement:** Dosing guided by fluid deficit and ongoing losses. Exact rates and volumes are often guided by institutional protocols and patient-specific factors. ## Pediatric Dosing Dosing is highly variable and depends on clinical indication, age, weight, and clinical status. * **Maintenance:** Typically 100 mL/kg/day for infants, 50-100 mL/kg/day for older children, and 30-50 mL/kg/day for adolescents. Rates generally range from 4 mL/kg/hr to 10 mL/kg/hr. * **Resuscitation:** Bolus of 10-20 mL/kg may be administered. Exact rates and volumes are often guided by institutional protocols and patient-specific factors. ## Dose Adjustments No dose adjustment is typically required based on renal or hepatic impairment, but overall fluid balance and electrolyte status must be closely monitored, especially in patients with impaired excretion. ## Contraindications * Generally considered safe; however, caution is advised in patients with: * Congestive heart failure * Severe renal impairment * Hypernatremia or fluid overload ## Adverse Effects * Fluid overload (edema, pulmonary congestion) * Hypernatremia (especially with excessive or rapid administration) * Electrolyte imbalances (dilutional hyponatremia) * Phlebitis at the infusion site ## Key Drug Interactions None directly with normal saline itself, but it can affect the concentration of other medications when used as a diluent. ## Monitoring * Fluid balance (intake and output) * Serum electrolytes (sodium, chloride) * Renal function (BUN, creatinine) * Signs of fluid overload (e.g., edema, lung auscultation) * Vital signs ## Clinical Pearls * Normal saline is often the preferred diluent for many intravenous medications due to its compatibility. * Rapid infusion can lead to hyperchloremic metabolic acidosis, particularly in large volumes. * Consider alternative solutions (e.g., Lactated Ringer's) in specific patient populations where a more balanced electrolyte profile is desired or to avoid hyperchloremia. *** **Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider and refer to the most current prescribing information for any medication.