Effects of a polymerized ultrapurified bovine hemoglobin blood substitute administered to ponies with normovolemic anemia.

The study explores the use of purified bovine hemoglobin in treating anemia in ponies, demonstrating that it can massively improve hemodynamics without damaging kidney function or disturbing blood clotting times. However, it was noted that animals should be monitored for potential adverse reactions during treatment.

Research Objective

The researchers aimed to determine whether the use of polymerized ultrapurified bovine hemoglobin (PUBH) could improve hemodynamic parameters in ponies who were experiencing normovolemic anemia. They also wanted to investigate whether the administration of PUBH would have any adverse effects on kidney function or coagulation times.

Methods

• The study was conducted with 6 healthy adult ponies. The researchers intentionally introduced normovolemic anemia within these ponies,
• A total of at least 45 mL/kg of whole blood was drawn from each pony over a 3-day period until a target packed cell volume (PCV) of under 12% was reached,
• After the blood was taken, the plasma was separated from the red blood cells and then re-administered to the ponies,
• Following the final plasma transfusion, 15 mL/kg of either PUBH or hetastarch (as control) was administered intravenously at 10 mL/kg/h.

Results

• In 5 out of the 6 ponies, no adverse effects were observed following the administration of PUBH.
• One pony exhibited an anaphylactoid reaction characterized by intense itching, rapid heartbeat, and fast breathing. However, this reaction subsided quickly once the infusion was stopped.
• In comparison to control animals, those ponies that received PUBH demonstrated significantly lower cardiac indices and heart rates.
• A significantly larger increase in central venous pressure was seen in the PUBH group as opposed to the hetastarch group.
• No ill effects were observed on either renal function or coagulation times in the ponies following PUBH administration.

Conclusion

The study concluded that PUBH can effectively enhance hemodynamics and oxygen transport parameters in ponies suffering from normovolemic anemia without causing harmful side effects on renal function or coagulation times. However, the researchers emphasized the need for close monitoring for any adverse reactions during the infusion process.