Post-transfusion survival of 50Cr-labeled erythrocytes in neonatal foals.

This research article discusses a study on the survival of transfused red blood cells in newborn foal (baby horses), using a stable isotope, 50Cr, to label the red blood cells. The results showed that red blood cells transfused from different sources had varying degrees of survival, those from unrelated horses survived the least, followed by those from the mothers, and the longest survival rate was noticed in the foal’s own blood cells.

Methodology

In the study, normal foals were transfused with labeled erythrocytes from three different sources:

• Their own erythrocytes (autologous)
• The erythrocytes of their dam (female parent horse)
• The erythrocytes of an unrelated castrated male (a gelding)

After transfusion, samples were taken at 15-minute intervals, once daily for a week, and then every 2 or 3 days for the next 20 days. The blood samples were analysed using inductively coupled argon-coupled mass spectrometry techniques to track the presence and ratio of stable isotopes, 50Cr and 57Fe.

Results and Conclusion

The decrease in the ratio of 50Cr to 57Fe was found to be exponential in all foals, indicating the loss of transfused erythrocytes over time. The half-life of the transfused red blood cells varied with the source of the cells:

• For autologous transfusions (those that used the foal’s own blood cells), the half-life was 11.7 days.
• For transfusions using the mother’s red blood cells, the half-life was 5.5 days.
• For transfusions using cells from an unrelated gelding, the half-life was 5.2 days.

These findings led the researchers to conclude that transfused red blood cells survive longer in newborn foals than in mature horses. Furthermore, the study demonstrated that 50Cr labeling can be used effectively to measure the survival of transfused erythrocytes. This discovery could have implications for transfusion practices in veterinary medicine, particularly for the treatment of newborn horses.