An experimental study on fluorocarbons as blood substitutes

Area of Science:

• Biomedical Engineering
• Toxicology
• Hematology

Background:

• Blood substitutes are crucial for medical emergencies.
• Fluorocarbon emulsions have been explored for oxygen transport.
• Assessing the safety and efficacy of new blood substitutes is vital.

Purpose of the Study:

• To evaluate the efficacy and safety of Fluosol DA 20% as a blood substitute in rats.
• To compare Fluosol DA 20% with a hydrolyzed gelatin solution (Emagel).
• To investigate the effects of varying degrees of hemodilution using Fluosol DA 20%.

Main Methods:

• Isovolemic exanguino-transfusions were performed on 45 rats.
• Three groups were studied: maximal hemodilution with Fluosol DA 20%, maximal hemodilution with Emagel, and partial hemodilution with Fluosol DA 20%.
• Parameters monitored included cerebral and cardiovascular activity, respiratory exchanges, acid-base balance, and organ histology.

Main Results:

• Maximal hemodilution (hematocrit = 0.5%) with Fluosol DA 20% led to altered cerebral activity at 2% hematocrit and death due to respiratory arrest at 0.5%.
• Partial hemodilution (hematocrit = 23%) with Fluosol DA 20% resulted in fluorocarbon particle retention in organs.
• Histological examination revealed lung and spleen lesions in rats receiving partial exchange-transfusion with Fluosol DA 20%.

Conclusions:

• Fluosol DA 20% demonstrated short-term efficacy but posed risks with maximal hemodilution.
• Long-term administration of Fluosol DA 20% led to fluorocarbon accumulation and organ toxicity.
• Further research is needed to address the safety concerns associated with Fluosol DA 20% for blood substitution.