Abstract: Eighty-two patients with supraventricular tachycardia undergoing radiofrequency catheter ablation (RFCA) were studied to observe the inhibition effect of aspirin and ticlopidine on platelet aggregability (PAG) and thromboxane B₂ (T XB₂) of the blood samples. Patients were divided into aspirin group A, ticlopidine group B, aspirin+ticlopidine group C and control group D. PAG and TXB₂ were increased clearly after RFCA in all groups (P<0.001). Treatment with aspirin or ticlopidine before operation could reduce the platelet aggregability caused by RF CA and the joint effect of two drugs (change rate of group A: 52.51±12.51%; group B: 54.78±11.27%; group C: 30.51±10.59%; group D: 91.75±21.43%; P<0.05) was studied. The much decreased platelet aggregability after antiplatelet therapy was evidence of the potential benefit of the treatment in preventing thromboembolism after ablation. Pretreatment with aspirin and ticlopidine together is a good way to decrease palatelet aggregability after RFCA

Key words: Catheter ablation, Platelet aggregability, Thromboxane B2, Aspirin, Ticlopidine

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