Related Experiment Videos
Developmental hemostasis: relevance to hemostatic problems during childhood
1Hamilton Civic Hospitals Research Center, Ontario, Canada.
Insights
Pediatric hemostasis differs significantly from adults, impacting diagnosis and treatment of bleeding disorders. Understanding these age-related changes is crucial for effective management in children.
Area of Science:
- Pediatric Hematology
- Hemostasis and Thrombosis
- Clinical Coagulation
Background:
- Congenital and acquired hemostatic disorders are common in children, necessitating accurate diagnosis for optimal therapy.
- Significant age-dependent differences exist in plasma concentrations of hemostatic components between children and adults.
- Physiological immaturity of the hemostatic system at birth influences coagulation, fibrinolysis, and response to therapies.
Purpose of the Study:
- To review the age dependency of hemostasis throughout childhood.
- To discuss the impact of the immature pediatric hemostatic system on diagnosing and treating hemostatic disorders.
- To provide insight into the regulation of coagulation and fibrinolysis in children.
Main Methods:
- Review of recent large-scale studies providing reference ranges for hemostatic components in healthy children.
- Analysis of age-specific data on coagulation and fibrinolysis in pediatric populations.
- Comparison of pediatric hemostatic component levels and function to adult values.
Main Results:
- New reference ranges for hemostatic components in children have been established through recent large studies.
- Physiologically low levels of some factors can complicate diagnosis of congenital deficiencies.
- Despite low inhibitor levels, thrombotic complications are rare in children; however, infants face risks like vitamin K deficiency bleeding.
Conclusions:
- Age-dependent variations in pediatric hemostasis significantly affect the diagnosis and treatment of hemostatic disorders.
- Understanding these physiological differences is essential for appropriate clinical management in pediatric patients.
- The immature hemostatic system in infants presents unique challenges, including altered responses to anticoagulants and thrombolytics.
Abstract:
Congenital and acquired hemostatic disorders present during childhood. An accurate diagnosis is critically important in order to implement optimal therapy. Over the last century, several investigators have measured plasma concentrations of hemostatic components in newborns and compared the results to adult values. Clinically significant differences exist for many hemostatic components. Recently, three large studies in more than 400 healthy children have provided reference ranges for hemostatic components throughout childhood. Together, these studies provide insight into the regulation of coagulation and fibrinolysis in children in physiologic and pathologic states. Some examples of the influence of age on hemostasis are: (1) the diagnosis of some congenital factor deficiencies, based on plasma levels, can be difficult due to physiologically low values; (2) despite very low levels of many inhibitors of hemostasis, thrombotic complications are rare; (3) the interaction of anti-coagulants and thrombolytic agents is profoundly influenced by the relative immaturity of hemostasis at birth; and (4) in contrast to the risk of thrombosis, healthy infants are at risk for vitamin K deficiency bleeding due to poor transport of vitamin K across the placenta and plasma concentrations of the vitamin K dependent proteins of less than 50% of adults values. The following review discusses the age dependency of hemostasis during childhood and the effect of the physiologically immature system on the diagnosis and treatment of hemostatic disorders.