Hemostasis in the Very Young

Area of Science:

• Hematology
• Neonatology
• Pediatric Coagulation

Background:

• Hemostasis, the process of blood clotting, significantly differs between neonates and adults.
• These age-related physiological changes are termed "developmental hemostasis."
• Neonates possess a unique hemostatic profile with implications for health and disease.

Purpose of the Study:

• To review the concept and clinical manifestations of developmental hemostasis.
• To discuss bleeding and thrombotic complications in neonates, particularly preterm infants.
• To explore age-specific phenotypes and treatment strategies for neonatal hemostatic disorders.

Main Methods:

• Literature review of developmental hemostasis.
• Analysis of hemostatic protein concentrations and function in neonates.
• Examination of clinical disease phenotypes, including hemorrhage and thrombosis.

Main Results:

• Neonates exhibit impaired platelet function and lower levels of certain coagulation factors, affecting clot firmness.
• Increased von Willebrand factor activity and reduced inhibitors can counterbalance these effects.
• Sick and preterm neonates have limited hemostatic reserve, increasing risks of bleeding or clotting.

Conclusions:

• Developmental hemostasis influences the presentation of bleeding and thrombotic disorders in neonates.
• Neonatal intracerebral/pulmonary hemorrhage and arterial ischemic stroke are significant concerns.
• Understanding these age-specific differences is crucial for diagnosis and treatment of neonatal hemostatic disorders.