Normal Saline 0.9% (Isotonic Sodium Chloride Injection)
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Composition: Each 100 mL contains 0.9 g of sodium chloride in water for injection (9 g/L NaCl), making it isotonic with body fluids.
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Osmolarity: ~308 mOsm/L
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Uses:
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Rehydration in fluid loss due to vomiting, diarrhea, burns, or hemorrhage
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Restores sodium and chloride balance
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Used as a vehicle for IV medications
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Cleansing wounds, nasal irrigation, and flushing catheters
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Benefits:
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Rapid volume replacement
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No significant fluid shift between intracellular/extracellular compartments
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Safe for most patients in moderate amounts
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Caution: Excessive use can cause hypernatremia, fluid overload, or acidosis in some cases.
Normal Saline 0.45% (Half Normal Saline)
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Composition: Each 100 mL contains 0.45 g of sodium chloride (4.5 g/L NaCl), making it hypotonic compared to body fluids.
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Osmolarity: ~154 mOsm/L
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Uses:
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Maintenance fluid therapy in pediatric and adult patients
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Management of hypernatremia or mild dehydration
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Used when lower sodium concentration is required
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Benefits:
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Avoids sodium overload
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Supports gentle rehydration over time
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Often combined with dextrose for additional energy and balance
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Caution: Risk of hyponatremia if used inappropriately or in large volume.
Normal Saline 3% (Hypertonic Sodium Chloride Solution)
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Composition: Each 100 mL contains 3 g of sodium chloride (30 g/L NaCl), significantly higher than plasma sodium.
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Osmolarity: ~1026 mOsm/L
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Uses:
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Emergency treatment of severe symptomatic hyponatremia
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Management of raised intracranial pressure (ICP) or cerebral edema
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Helps shift fluid from intracellular to extracellular space
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Benefits:
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Quickly raises serum sodium levels
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Reduces brain swelling and ICP effectively in ICU settings
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Caution:
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Must be used only under strict medical supervision
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Risk of osmotic demyelination if sodium rises too quickly
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Requires monitoring of serum sodium, electrolytes, and fluid status
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