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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Prehospital Thrombolysis: A Manual from Berlin
05:52

Prehospital Thrombolysis: A Manual from Berlin

Published on: November 26, 2013

Plasminogen-enriched pulse-spray thrombolysis with tPA: further developments.

J J Bookstein1, F L Bookstein

  • 1Division of Research, VA Hospital, La Jolla, California, USA. jbookstein@popmail.ucsd.edu

Journal of Vascular and Interventional Radiology : JVIR
|December 1, 2000
PubMed
Summary

Optimizing plasminogen-enriched pulse-spray thrombolysis significantly improved clot lysis in rabbits. This enhanced method achieved 89% lysis in one hour, outperforming tissue plasminogen activator alone.

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06:16

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Published on: April 19, 2024

Area of Science:

  • Biomedical Engineering
  • Thrombosis Research
  • Pharmacology

Background:

  • Thrombolysis aims to dissolve blood clots, improving outcomes in conditions like deep vein thrombosis.
  • Tissue plasminogen activator (tPA) is a key thrombolytic agent, but its efficacy can be enhanced.
  • Pulsed-spray delivery and plasminogen enrichment are strategies to improve thrombolysis.

Purpose of the Study:

  • To refine pulsed plasminogen-enriched thrombolysis methods.
  • To compare the efficacy of optimized plasminogen-enriched thrombolysis with tissue plasminogen activator (tPA) alone.

Main Methods:

  • Experimental thrombolysis was induced in rabbits with inferior vena cava thrombosis.
  • Parameters of pulsed plasminogen-enriched thrombolysis were systematically varied, including tPA pulse frequency, plasminogen amount, tPA concentration, and delivery method (pulsed vs. infused).
  • Residual thrombus weight after one hour was measured to assess lysis efficacy.

Main Results:

  • Optimized methods, using 3 mg tPA and approximately 0.9 mg plasminogen enrichment, showed efficacy directly related to pulse frequency (every 30 seconds optimal).
  • Maximum efficacy was achieved with plasminogen enrichment up to approximately 1.8 mg per 1.24 g of clot.
  • Optimized plasminogen-enriched thrombolysis achieved 89% clot lysis in one hour, significantly higher than the 74% lysis reported for optimized tPA alone.

Conclusions:

  • Optimized in vivo plasminogen enrichment significantly accelerates thrombolysis of experimental clots.
  • This approach offers a superior alternative to using optimized tissue plasminogen activator alone for clot dissolution.