Ultrasound and Clinical Predictors of Recurrent XXXX in Symptomatic Internal Carotid @entity432 .

@entity1 @entity432 @entity6 @entity63
BACKGROUND AND PURPOSE: Occlusion of the internal carotid artery puts @entity1 at risk of recurrent @entity63 events because of hemodynamic compromise. Our goal was to characterize clinical and duplex parameters indicating @entity1 at risk of recurrent @entity63 . METHODS: We retrospectively identified @entity1 with @entity432 . Clinical characteristics and ultrasound parameters, including collateral networks, were analyzed. Predictors for recurrent @entity63 were investigated by Cox regression analysis. RESULTS: Of 68 @entity1 , at least 1 recurrent @entity63 event within the same vascular territory was observed in 14 @entity1 (20.6%) within 2 to 92 days (median, 29.5 days). The median follow-up period was 6 months. @entity6 and previous transient @entity63 attack were associated with recurrence, as was activation of the maximum number of collateral pathways on transcranial ultrasound (28.6% versus 5.6%; P=0.03). Furthermore, flow in the posterior cerebral arteries was higher in @entity1 with recurrence in ipsilateral and contralateral posterior cerebral artery P2 segments (76 IQR 37.5 versus 59, IQR 22.5 cm/s and 68, IQR 35.6 versus 52, IQR 21 cm/s; P<0.01 and 0.02). CONCLUSIONS: Flow increases in both posterior cerebral artery P2 segments suggest intensified compensatory efforts when other collaterals are insufficient. Together with the presence of @entity6 and a history of transient @entity63 attack, this duplex parameter indicates that @entity1 with internal carotid artery are at particular risk of recurrent @entity63 .
