Plasma Substitutes

Definition of Plasma Substitutes:

• These are artificial fluids used to replace lost blood volume in cases of shock, severe burns, or hemorrhage.
• They do not contain red blood cells or clotting factors but help maintain circulation.

Types of Plasma Substitutes:

1. Crystalloids (Electrolyte Solutions):

   • Examples: Normal saline (0.9% NaCl), Ringer’s lactate
   • Used for short-term fluid replacement in dehydration and mild blood loss.

2. Colloids (Plasma Expanders):

   • Contain large molecules that retain water in the bloodstream.
   • Examples:
     • Albumin (Human-derived protein) – Maintains oncotic pressure.
     • Dextran (Synthetic polysaccharide) – Used for hypovolemic shock.
     • Hydroxyethyl starch (HES) – Commonly used in critical care.
     • Gelatin-based solutions – Alternative plasma volume expanders.

Advantages of Plasma Substitutes:

• Readily available and free from infection risks.
• No need for blood typing or cross-matching.
• Effective in treating shock and hypovolemia.

Limitations:

• Do not carry oxygen (unlike real blood).
• Overuse can lead to coagulation issues and kidney damage.

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