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An Echogenic Clot Method for Thrombolysis Monitoring in Thrombotic Stroke Models
Dalton E Carter1, Tao Peng1, Melanie R Moody1
1Department of Internal Medicine, Division of Cardiovascular Medicine, University of Texas Health Science Center at Houston, Houston, Texas 77030, U.S.A.
Medical Research Archives
|December 4, 2023
Summary
Researchers developed an echogenic liposome formulation for targeted clot dissolution in stroke models. This method uses ultrasound to quantitatively measure clot breakdown, showing promise for improved thrombolytic therapy.
Area of Science:
- Biomedical Engineering
- Pharmacology
- Radiology
Background:
- Ischemic stroke treatment relies on thrombolytic therapy, typically with tissue plasminogen activator (tPA).
- Evaluating directed thrombolytic therapy requires accurate, quantitative methods for monitoring clot dissolution.
- Current methods may lack the precision needed for assessing novel drug delivery systems like liposomes.
Purpose of the Study:
- To develop and validate an ultrasound-based method for quantitatively monitoring thrombus dissolution.
- To assess the thrombolytic efficacy of a tissue plasminogen activator (tPA)-loaded echogenic liposome (TELIP) formulation in a rabbit stroke model.
- To determine if incorporating an ultrasound contrast agent into clots affects tPA-mediated clot dissolution.
Main Methods:
- Rabbit blood clots were prepared with varying concentrations of microcrystalline cellulose to optimize echogenicity.
- Clot dissolution was induced using recombinant tPA (rtPA) in porcine plasma.
- Clot echogenicity was assessed using ultrasound imaging and videodensitometric analysis; mass loss measurements were used for comparison.
Main Results:
- A concentration of 1.12 mg/ml microcrystalline cellulose in rabbit blood clots provided optimal echogenicity.
- This echogenicity did not significantly affect rtPA-mediated clot dissolution rates (0.3-0.6 mg/min).
- Ultrasound-based videodensitometric analysis of echogenic clots showed good agreement with mass loss measurements for clot dissolution rate.
Conclusions:
- Ultrasound imaging with echogenic clots provides a reliable method for quantitative assessment of thrombolytic efficacy.
- This technique is suitable for evaluating directed thrombolytic therapies, such as TELIP formulations, in preclinical stroke models.
- The developed method may facilitate the demonstration of in vivo efficacy and potentially reduced hemorrhagic effects of targeted tPA delivery.
