The patients in the platelet function monitoring guided group received an antiplated therapy guided by a modified thromboelastography ( TEG ) platelet mapping : If inhibition of platelet aggregation ( IPA ) induced by arachidonic acid ( AA ) was less than 50 % the aspirin dosage was raised to 200 mg/d ; if IPA induced by adenosine diphosphate ( ADP ) was less than 30 % the clopidogrel dosage was raised to 150 mg/d , for three months .