Related Experiment Videos
New insights on vitamin K
1Section of Pediatric Hematology-Oncology, University of Colorado School of Medicine, Denver.
Hematology/Oncology Clinics of North America
|September 1, 1987
Summary
Vitamin K deficiency can be detected by measuring noncarboxylated coagulation proteins. Prophylactic vitamin K is crucial for newborns, especially breast-fed infants, to prevent hemorrhagic disease of the newborn (HDN).
Area of Science:
- Biochemistry
- Hematology
- Pediatrics
Background:
- Vitamin K is essential for the carboxylation of specific glutamate residues in vitamin K-dependent proteins.
- These proteins include coagulation factors II, VII, XI, X, and proteins C and S, crucial for hemostasis.
- Noncarboxylated forms of these proteins serve as biomarkers for vitamin K status.
Observation:
- Vitamin K deficiency manifests in various clinical states, including early, classic, and late hemorrhagic disease of the newborn (HDN).
- Malabsorption syndromes and certain drug interactions (e.g., warfarin, anticonvulsants, antibiotics) can impair vitamin K metabolism.
- Idiopathic late HDN, characterized by central nervous system bleeding, predominantly affects exclusively breast-fed infants.
Findings:
- Detection of undercarboxylated coagulation proteins provides a specific indicator of vitamin K deficiency.
- Vitamin K prophylaxis administered parenterally or orally at birth effectively prevents vitamin K deficiency and associated bleeding disorders in newborns.
- This prophylaxis is particularly vital for exclusively breast-fed infants at risk for idiopathic late HDN.
Implications:
- Routine vitamin K prophylaxis at birth is recommended for all neonates to prevent hemorrhagic disease of the newborn.
- Infants with malabsorption syndromes require vigilant monitoring and appropriate vitamin K supplementation.
- Understanding vitamin K's role in coagulation is critical for managing bleeding risks in diverse clinical settings.