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Related Experiment Videos

The Retention Index Test Homburg (RTH-II): Response to clopidogrel and comparison with aggregometry and

U Klinkhardt1, E Wenzel, S Harder

  • 1Pharmazentrum frankfurt, Institute for Clinical Pharmacology, University Hospital Frankfurt am Main, Frankfurt am Main, Germany.

Platelets
|November 26, 2005
PubMed
Summary

The Retention Index Test Homburg (RTH-II) effectively monitors antiplatelet therapy by detecting changes in platelet function. This test shows a significant correlation with P2Y12-inhibitor effects on platelet degranulation.

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Area of Science:

  • Hematology
  • Pharmacology
  • Medical Diagnostics

Background:

  • Platelet activation and signaling are crucial in thrombosis.
  • Antiplatelet therapies, like P2Y12-inhibitors, aim to modulate platelet function.
  • Monitoring the efficacy of antiplatelet drugs is essential for patient care.

Purpose of the Study:

  • To evaluate the Retention Index Test Homburg (RTH-II) as a tool for monitoring antiplatelet therapy.
  • To assess the correlation between RTH-II and established platelet function assays after clopidogrel administration.
  • To investigate the role of ADP receptor signaling and CD62P expression in platelet retention.

Main Methods:

  • ADP (2 microM)-triggered RTH-II was performed in parallel with light-transmittance aggregometry and flow cytometry.

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  • Platelet function was assessed in subjects before and after a loading dose of clopidogrel (225 mg).
  • Expression of CD62P and PAC-1 binding were measured as indicators of platelet activation.

    • Main Results:

    • Clopidogrel significantly reduced ADP-stimulated retention index (RI), aggregation response, and CD62P expression (p < 0.01).
    • A significant correlation was observed between RI and CD62P expression (p < 0.01), but not with aggregation.
    • Platelets not retained showed lower CD62P expression, suggesting its role in retention.

    Conclusions:

    • RTH-II is a potential tool for monitoring P2Y12-inhibitors' effects on platelet degranulation.
    • The test correlates with CD62P expression, indicating its utility in assessing antiplatelet therapy.
    • RTH-II may serve as a simple, complementary assay to aggregometry for platelet function monitoring.