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Related Experiment Videos

Kinetics of 111In-labelled platelets in healthy subjects.

K G Schmidt, J W Rasmussen, A D Rasmussen

    Scandinavian Journal of Haematology
    |May 1, 1985
    PubMed
    Summary

    This study tracked indium-111 labeled platelets in healthy individuals, revealing an average platelet lifespan of 185.3 hours. Platelet destruction primarily occurs in the spleen, liver, and bone marrow.

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    Methodological issues in polymerase chain reaction for RNA.

    Methods in molecular medicine·2011

    Area of Science:

    • Nuclear Medicine
    • Hematology
    • Pharmacokinetics

    Background:

    • Platelet kinetics are crucial for understanding hemostasis and thrombosis.
    • Accurate measurement of platelet lifespan and distribution is essential for diagnosing and managing various hematological disorders.
    • Indium-111 (111In) labeled platelets offer a method for in vivo imaging and kinetic studies.

    Purpose of the Study:

    • To evaluate platelet kinetics and biodistribution in healthy subjects using 111In-labeled platelets.
    • To determine the mean platelet lifetime and in vivo recovery.
    • To investigate the sites of platelet destruction and sequestration.

    Main Methods:

    • 25 healthy subjects underwent platelet kinetic and scintigraphic studies.
    • Platelets were labeled with 111In and injected intravenously.
    • Platelet survival and biodistribution were analyzed using the multiple hit model and semiquantitative scintigraphy.
    • Comparison with simultaneously injected 51Cr-labeled platelets was performed in 7 subjects.

    Main Results:

    • Mean platelet lifetime averaged 185.3 hours (range 141.2-225.6 hours).
    • Platelet in vivo recovery averaged 56% (range 42-89%).
    • Platelet destruction was estimated to occur in the spleen (45%), liver (25%), and bone marrow (30%).
    • A slight curvature in 111In-platelet survival curves compared to 51Cr-platelets suggested 111In elution.
    • Platelet sequestration in the spleen and liver was observed, alongside bone marrow destruction.

    Conclusions:

    • 111In-labeled platelets provide valuable data on platelet kinetics and biodistribution in healthy individuals.
    • The study quantifies platelet lifespan and identifies major sites of platelet destruction.
    • Potential 111In elution and reversible sequestration should be considered in interpreting platelet kinetic data.

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