All patients were underwent Matas 'test for 2 weeks before ligation, 4 patients were used transcranial Doppler monitoring intra-and postoperatively, all patients were sent to the ICU under custody after operation. 术前均行马他氏(Matas'test)试验2周,4例术中、术后行多普勒监测,全部病例术后进行心电、血压等监护。