The rates of platelet aggregation ( PAG ) in the immediate postoperative ASD/VSD occlusion were significantly higher than those in the preoperative ASD/VSD occlusion ( adenosine diphosphate [ ADP ] - induced PAG : 64.98 % 7.65 % vs. 86.33 % 6.54 % , p < 0.05 ; arachidonic acid [ AA ] - induced PAG : 62.92 % 9.11 % vs. 86.96 % 6.90 % , p < 0.05 , respectively ) .