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# Normal Saline (0.9% Sodium Chloride) ## Overview 0.9% Sodium Chloride (Normal Saline) is an isotonic crystalloid solution used for intravenous fluid replenishment. ## Primary Indications * Volume resuscitation in hypovolemia, shock, and dehydration. * Maintenance fluid therapy. * Diluent for IV drug administration. * Wound irrigation. * Bladder irrigation. ## Adult Dosing * **Resuscitation:** Typically administered as a bolus of 1-2 liters rapidly. Subsequent fluid administration is guided by hemodynamic response. * **Maintenance:** Generally dosed at 25-35 mL/kg/day (e.g., approximately 1.5-2.5 liters/day for a 70 kg adult), administered at a rate of 75-125 mL/hr. * **Diluent:** Concentration and volume depend on the specific drug being reconstituted and the desired final concentration. ## Pediatric Dosing * **Resuscitation:** 20 mL/kg bolus, may be repeated up to 3 times. * **Maintenance:** Typically 3 mL/kg/hr for infants <10 kg, 100 mL/kg/day for children 10-20 kg, and 1500 mL + 20 mL/kg for each kg >20 kg (maximum 2400 mL/day). The rate should not exceed 10 mL/kg/hr. ## Dose Adjustments * No dose adjustment is necessary for renal or hepatic impairment, but fluid overload and electrolyte imbalances must be carefully monitored. ## Contraindications * Known hypersensitivity to sodium chloride. * Severe heart failure, severe renal impairment, or conditions where edema with sodium retention may be dangerous (e.g., in patients with uncontrolled hypertension). ## Adverse Effects * **Fluid Overload:** Manifested as edema, pulmonary edema, shortness of breath, hypertension, and congestive heart failure. * **Hypernatremia:** Especially with excessive or rapid administration, or in patients with impaired water excretion. Symptoms can include confusion, lethargy, muscle twitching, seizures. * **Local Irritation:** Phlebitis at the injection site. * **Hyponatremia:** Can occur if used excessively for maintenance in patients with impaired water excretion, leading to cerebral edema. ## Key Drug Interactions * Corticosteroids and other drugs that promote sodium retention can potentiate the risk of hypernatremia and fluid overload. ## Monitoring * **Fluid Status:** Monitor intake and output, daily weights, vital signs (blood pressure, heart rate), and signs of edema. * **Electrolytes:** Serum sodium, chloride, and bicarbonate levels, especially in patients with risk factors for imbalance or receiving large volumes. * **Renal Function:** Monitor serum creatinine and BUN. ## Clinical Pearls * Normal saline is the preferred fluid for initial resuscitation in hypovolemic shock due to its rapid expansion of intravascular volume. * Avoid rapid infusion in patients with heart failure or renal insufficiency to prevent fluid overload. * Use with caution in patients with hypernatremia or those at risk. * When used as a diluent, ensure compatibility with the active drug. *** _This information is intended as a quick reference and does not substitute for a thorough review of the current prescribing information. Always verify with the latest official drug monographs and institutional protocols._