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Factor VIII activity and antigen in sick newborns with pathological proteolysis in blood
Insights
Sick newborns often show a discrepancy between factor VIII clotting activity (VIII:C) and factor VIII related antigen (VIII:R:AG). This finding suggests pathological proteolysis, aiding in diagnosing newborns with this condition.
Area of Science:
- Neonatal Medicine
- Hematology
- Biochemistry
Background:
- Pathological proteolysis can affect coagulation factors in newborns.
- Factor VIII clotting activity (VIII:C) and factor VIII related antigen (VIII:R:AG) are critical hemostatic markers.
Purpose of the Study:
- To investigate the relationship between VIII:C and VIII:R:AG in sick newborns.
- To determine if a discrepancy between these factors indicates pathological proteolysis.
Main Methods:
- Measurement of factor VIII clotting activity (VIII:C) in sick newborns.
- Measurement of factor VIII related antigen (VIII:R:AG) in the same infants.
- Comparison of VIII:R:AG to VIII:C ratios in sick versus healthy newborns.
Main Results:
- Sick newborns exhibited a marked discrepancy between VIII:R:AG and VIII:C, with an average ratio of 2:1.
- Healthy newborns showed no significant discrepancy between VIII:R:AG and VIII:C.
- The observed discrepancy mimicked experimental findings of low-grade plasminogen activation.
Conclusions:
- A significant discrepancy between VIII:R:AG and VIII:C is a valuable indicator of pathological proteolysis in sick neonates.
- This marker can aid in the early detection and diagnosis of proteolysis-related complications in newborns.
- Further research into plasminogen activation pathways in neonatal pathology is warranted.
Abstract:
Factor VIII clotting activity (VII:C) and factor VIII related antigen (VIII:R:AG) were determined in 12 sick newborn infants with pathological proteolysis in their circulation. A marked discrepancy was noted between VIII:R:AG and VIII:C, the ratio in sick infants being, on average, 2:1, while no discrepancy was seen in healthy newborns. The finding in the sick infants resembled a low grade plasminogen activation, which was studied experimentally. It is concluded that demonstration of a marked discrepancy between VIII:R:AG and VIII:C is a useful indication of pathologic proteolysis in sick newborns.