Dynamic monitoring of platelet activation and its role in post-dissection inflammation in a canine model of acute type A aortic dissection.

Abstract

BACKGROUND: To confirm the activation of platelets (PLT) and explore the role of activated PLT in post-dissection inflammation. METHOD: An acute type A aortic dissection (AAD) canine model was established. Mean platelet volume/platelet count (MPV/PTC), platelet size distribution width (PDW), and inflammatory cytokines (tumor necrosis factor-&#x3b1; [TNF-&#x3b1;] and interleukin-6 [IL-6]) were measured between anesthetization and thoracotomy (T1), at the end of the operation (T2), and at 2 h (T3), 4 h (T4), and 6 h (T5) after the operation. Bivariate analysis was used to determine the correlations between the peak MPV/PTC, PDW, and inflammatory cytokines at T4. RESULT: An AAD canine model was successfully established. Both MPV/PTC and PDW values were significantly higher at T3-T5 than at T1 (P&#x2009;<&#x2009;0.05). Both were also significantly higher at T3-T5 in the dissection group than in the sham operation (SO) group (P&#x2009;<&#x2009;0.05). Inflammatory cytokine levels were remarkably higher at T3-T5 than at T1, and were higher at T3-T5 in both the dissection and the SO group (P&#x2009;<&#x2009;0.05). Bivariate analysis demonstrated positive correlations between MPV/PTC and both TNF-&#x3b1; (r&#x2009;=&#x2009;0.826, P&#x2009;=&#x2009;0.011) and IL-6 (r&#x2009;=&#x2009;0.806, P&#x2009;=&#x2009;0.016). CONCLUSION: Activated PLT were identified after AAD, and played a critical role in the initiation of post-dissection inflammation.