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Thrombin activation and late restenosis after percutaneous transluminal coronary angioplasty
A Salvioni1, S Galli, G Marenzi
1Istituto di Cardiologia dell'Università degli Studi, Centro di Studio per le Ricerche Cardiovascolari del Consiglio Nazionale delle Ricerche, Fondazione Monzino, IRCCS, Milan, Italy.
Insights
Thrombin activity, measured by fibrinopeptide A (FPA) levels, appears to predict restenosis after percutaneous transluminal coronary angioplasty (PTCA). Elevated FPA post-procedure indicates a higher risk of restenosis.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Biochemistry
Background:
- Restenosis following percutaneous transluminal coronary angioplasty (PTCA) mechanisms remain unclear.
- Experimental data suggest thrombin's significant role in restenosis via platelet growth factor and smooth muscle cell proliferation.
Purpose of the Study:
- To investigate the role of thrombin in restenosis after PTCA.
- To evaluate thrombin activity using fibrinopeptide A (FPA) levels as a potential predictor of restenosis.
Main Methods:
- Serial plasma FPA levels were measured in 34 patients undergoing PTCA.
- Measurements were taken before, immediately after, and 24, 72 hours, and 6 months post-procedure.
- Patients were categorized based on restenosis development at 6-month angiographic follow-up.
Main Results:
- No significant difference in baseline FPA levels between groups.
- Patients who developed restenosis showed significantly higher FPA levels immediately after PTCA compared to those who did not (27.3 vs 9.2 ng/ml).
- No other significant differences in FPA levels were observed at subsequent time points.
Conclusions:
- Thrombin activity, indicated by FPA levels, is implicated in the restenosis process post-PTCA.
- The acute FPA response to PTCA may serve as a predictive marker for restenosis development.
Background:
Mechanisms of restenosis after percutaneous transluminal coronary angioplasty (PTCA) have not been defined yet. Experimental studies have shown that thrombin, by stimulating platelet growth factor secretion and smooth muscle cell proliferation, can play a major role.
Methods And Results:
In 34 patients with single-vessel coronary disease undergoing PTCA, thrombin activity was evaluated through serial fibrinopeptide A (FPA) plasma determinations. Samples were performed before PTCA, immediately after and 24 hours, 72 hours, and 6 months later. Patients were grouped according to the development (group 1, n = 13) or nondevelopment (group 2, n = 21 ) of restenosis at a 6-month angiographic control. No difference in the two groups was found concerning baseline FPA values. In patients in group 1, soon after PTCA higher FPA levels (27.3 +/- 13.7 ng/ml) than those in group 2 (9.2 +/- 5.6 ng/ml; p < 0.05 vs pre-PTCA, and p < 0.01 between the two groups) were observed. No differences in FPA levels were detected at the other steps between the two groups.
Conclusion:
Our data suggest that thrombin plays a role in the process of restenosis after PTCA; acute FPA response to the procedure seems to have a predictive value.