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Related Experiment Videos

Platelet function in the newborn.

A D Michelson1

  • 1Center for Platelet Function Studies, Department of Pediatrics, University of Massachusetts Medical School, Worcester 01655, USA.

Seminars in Thrombosis and Hemostasis
|March 5, 1999
PubMed
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Neonatal platelets show reduced reactivity compared to adult platelets, potentially contributing to intraventricular hemorrhage (IVH) in very low birth weight (VLBW) preterm neonates. This platelet hyporeactivity improves within two weeks of life.

Area of Science:

  • Hematology
  • Neonatology
  • Biomedical Engineering

Background:

  • Platelet function assessment is crucial, especially in neonates where minimal blood volume is preferred.
  • Whole blood flow cytometry offers a sensitive method for evaluating platelet function using small blood samples.

Purpose of the Study:

  • To investigate neonatal platelet reactivity using whole blood flow cytometry.
  • To compare platelet function between neonatal and adult subjects.
  • To explore the potential link between neonatal platelet hyporeactivity and intraventricular hemorrhage (IVH) in very low birth weight (VLBW) preterm neonates.

Main Methods:

  • Utilized whole blood flow cytometry to assess platelet function.
  • Measured platelet surface expression of P-selectin, glycoprotein (GP) IIb-IIIa, and GPIb-IX complex.

Related Experiment Videos

  • Compared activation responses to physiological agonists between neonatal and adult platelets.

    • Main Results:

    • Neonatal platelets exhibited significantly lower reactivity to physiological agonists compared to adult platelets.
    • Observed reduced P-selectin and GP IIb-IIIa expression and decreased GPIb-IX expression on neonatal platelets post-activation.
    • Platelet hyporeactivity was maximal in VLBW preterm neonates on days 3-4 of life, normalizing by days 10-14.

    Conclusions:

    • Neonatal platelet hyporeactivity may stem from defects in common signal transduction pathways.
    • The timing of maximal platelet hyporeactivity coincides with the peak incidence of IVH in VLBW preterm neonates, suggesting a potential causal relationship.
    • Whole blood flow cytometry is a valuable tool for neonatal platelet function studies.