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# Normal Saline (0.9% Sodium Chloride) ## Overview 0.9% sodium chloride (normal saline) is an isotonic crystalloid solution used for fluid and electrolyte replacement. ## Primary Indications * Volume resuscitation in hypovolemia (e.g., hemorrhage, dehydration, burns). * Maintenance of hydration. * Diluent for IV medications. * Treatment of hyponatremia (cautiously). * Wound irrigation. ## Adult Dosing Dosing is highly individualized based on clinical status, degree of volume deficit, and underlying conditions. * **Resuscitation:** Bolus doses of 250-1000 mL, repeated as needed until hemodynamic stability is achieved. Maximum rate and volume depend on patient condition and response. Some protocols may recommend up to 30 mL/kg in the initial resuscitation of shock. * **Maintenance:** Typically 1-2 liters per 24 hours, adjusted based on fluid balance. * **Diluent:** Varies by medication; consult specific drug monograph. ## Pediatric Dosing Dosing is highly individualized based on patient weight, clinical status, and degree of volume deficit. * **Resuscitation:** Bolus doses of 10-20 mL/kg, repeated as needed. * **Maintenance:** Typically 100 mL/kg/day for patients weighing up to 10 kg, 1000 mL + 50 mL/kg for patients weighing 10-20 kg, and 1500 mL + 25 mL/kg for patients weighing over 20 kg. These are general guidelines and require adjustment based on individual needs. * **Diluent:** Varies by medication; consult specific drug monograph. ## Dose Adjustments * **Renal Impairment:** Use with caution; fluid overload and electrolyte imbalances (hyperkalemia, hypernatremia) can occur. Rate of infusion should be carefully controlled. * **Heart Failure:** Use with caution; risk of fluid overload. * **Hepatic Impairment:** Use with caution; risk of fluid overload. ## Contraindications * Known hypersensitivity to sodium chloride. * Severe hypernatremia. * Conditions where fluid overload is detrimental (e.g., severe heart failure, pulmonary edema). ## Adverse Effects * **Fluid overload:** Edema, hypertension, dyspnea, pulmonary edema. * **Electrolyte imbalances:** Hypernatremia (especially with impaired renal function or excessive administration), hyperchloremia. * **Vein irritation** at the infusion site. ## Key Drug Interactions * Corticosteroids: May potentiate sodium retention. * Lithium: Saline can decrease lithium levels. ## Monitoring * **Fluid balance:** Input and output, daily weights. * **Electrolytes:** Serum sodium, potassium, chloride, bicarbonate. * **Renal function:** Creatinine, BUN. * **Vital signs:** Blood pressure, heart rate, respiratory rate. * **Signs of fluid overload:** Edema, lung sounds. ## Clinical Pearls * Normal saline is generally considered the fluid of choice for initial resuscitation in shock. * Rapid infusion can lead to hyperchloremic metabolic acidosis, particularly in patients with renal impairment or when large volumes are administered. Consider balanced crystalloids in certain situations if local protocol allows. * Use of hypotonic solutions (e.g., 0.45% NaCl) for maintenance hydration in children may be preferred to reduce the risk of hyponatremia, depending on clinical status and electrolyte levels. * For diluting medications, ensure compatibility and appropriate concentration for administration. *** *This information is intended for healthcare professionals and does not replace current prescribing information. Always verify with the official drug monograph and institutional protocols.*