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Eighty-two patients with supraventricular tachycardia undergoing radi o frequency 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, ticlopi di ne group B, aspirin+ticlopidine group C and control group D. PAG and TXB2 were i ncreased clearly after RFCA in all groups (P