IV Fluids Guide and Cheat Sheets

Introduction to IV Fluids

• Intravenous fluids (IV fluids) are supplemental fluids used in intravenous therapy.
• Restore or maintain normal fluid volume and electrolyte balance.
• Delivered directly into the intravascular compartment.
• Useful when oral intake is not possible.

Types of IV Fluids

Based on Tonicity

• Isotonic: Same concentration of solutes as blood plasma.
• Hypotonic: Lower concentration of solutes than plasma.
• Hypertonic: Higher concentration of solutes than plasma.

Based on Purpose

• Nutrient solutions: Provide calories via dextrose, prevent dehydration (e.g., D5W).
• Electrolyte solutions: Replace fluid and electrolytes (e.g., 0.9% NaCl).
• Alkalinizing solutions: Treat metabolic acidosis (e.g., LRS).
• Acidifying solutions: Counteract metabolic alkalosis (e.g., D51/2NS).
• Volume expanders: Increase blood volume after severe loss (e.g., dextran).

Crystalloids

• Contain small molecules, flow easily across semipermeable membranes.
• Isotonic Solutions: Expand both intracellular and extracellular fluid spaces.
  • 0.9% NaCl: Used for ECF expansion, blood transfusion.
  • D5W: Provides free water, becomes hypotonic after dextrose metabolism.
  • Lactated Ringers: Mimics blood plasma composition, treats dehydration.
  • Ringers Solution: Similar to lactated ringers but without lactate.
• Hypotonic Solutions: Shift fluid into cells, causing them to swell.
  • 0.45% NaCl: Used for hypernatremia.
  • D2.5W: Treats cellular dehydration.
• Hypertonic Solutions: Shift fluid out of cells, causing shrinkage.
  • 3% NaCl: Treats severe hyponatremia.
  • D10W: Provides calories, treats ketosis.

Colloids

• Contain large molecules that don't pass through semipermeable membranes.
• Useful for expanding intravascular volume.
• Human Albumin: Increases volume, used for burns and trauma.
• Dextrans: Used for improving circulation, contraindicated in some conditions.
• Etherified Starch: Increases intravascular fluid but may affect coagulation.
• Gelatin: Shorter circulation time than dextrans.

Cheat Sheets

• Provides quick reference for various IV fluids and their properties.
• Available for isotonic, hypotonic, hypertonic, and colloid solutions.

Nursing Considerations

• Baseline Data: Assess vital signs, edema, lung and heart sounds.
• Monitor Fluid Balance: Watch for signs of overload or deficit.
• Patient Education: Inform about signs of fluid overload.
• Specific Instructions: Varies with the type of solution used.

Recommended Resources

• Includes pharmacology flashcards and textbooks to enhance learning.

Conclusion

• Understanding IV fluids is crucial for effective patient care.