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Embolization itself stimulates thrombus propagation in pulmonary embolism
Timothy A Morris1, James J Marsh, Peter G Chiles
1Department of Medicine, University of California San Diego, San Diego, CA 92103-8378, USA. t1morris@ucsd.edu
Summary
Pulmonary embolism triggers increased thrombotic activity in existing venous thrombi. Heparin administration effectively prevents this embolization-associated thrombus propagation, highlighting its therapeutic potential.
Area of Science:
- Cardiovascular Research
- Thrombosis and Hemostasis
- Pulmonary Medicine
Background:
- The precise role of active thrombosis in pulmonary embolism (PE) pathophysiology remains incompletely understood.
- Investigating the impact of embolization on the thrombotic activity of venous thrombi is crucial for understanding PE progression.
Purpose of the Study:
- To test the hypothesis that venous thrombi significantly increase thrombotic activity upon embolization into pulmonary arteries.
- To evaluate the efficacy of heparin in preventing embolization-associated thrombus propagation.
Main Methods:
- Thrombi were induced in the femoral veins of adult dogs.
- Thrombotic activity was quantified using an immunoassay measuring fibrinopeptide B (FPB) and des-arginine FPB.
- Dogs were divided into two groups: one embolized without anticoagulation, and one treated with heparin prior to embolization.
Main Results:
- Plasma FPB concentrations were significantly lower in the heparinized group compared to the non-heparinized group for 1 hour post-embolization (P = 0.038).
- This indicates that heparin effectively suppressed thrombotic activity associated with pulmonary embolization.
Conclusions:
- Pulmonary embolization markedly intensifies the thrombotic activity of preexisting venous thrombi.
- Heparin administration is effective in preventing embolization-associated thrombus propagation, suggesting its critical role in managing PE.