Fig. 1
Changes of perioperative platelets activation level. Platelets count decreased significantly at the end of CPB (T2) and increased from T3 to T6 (P < 0.05). Mean platelet volume (MPV) increased at T2 and then back to normal gradually (P < 0.05). MPV/platelet count increased significantly at T2 and decreased from T3 to T6 (P < 0.05). *P < 0.05 vs. T1. T1: before induction of anaesthesia; T2: at the end of CPB; T3: 12 h post-CPB; T4: 24 h post-CPB; T5: 48 h post-CPB; T6: 72 h post-CPB. Units of left y axis (platelet count): ×109 per litre; Units of left y axis (MPV): femtoliter (fl)