[Evaluation of blood supply dynamics and possibilities of cerebral arteriovenous malformations ( XXXX ) imaging by means of transcranial color-coded duplex sonography (TCCS)].

@entity1 @entity4798 @entity2758 @entity2695 @entity600
The present study was carried out in 12 @entity1 (7 males and 5 females) aged 16-56 years (mean age 35.9) with @entity2758 diagnosed in cerebral angiography. The examination was performed by means of ATL ULTRAMARK 9 with low-frequency (2MHz to 3MHz) transducer. Assessment was made of possibilities of imaging @entity2758 by transcranial colour-coded duplex sonography and of blood flow values in the studied intracranial arteries. Statistical analysis was applied of the following blood flow parameters: mean velocity, peak systolic velocity, end diastolic velocity, pulsatility index (PI), resistance index (RI), pulsatility transmission index (PTI) and relative flow velocity (RFV). The @entity600 were imaged using TCCS in 9 (75%) @entity1 . In two-dimensional B mode image the @entity2695 displayed echogenicity similar to the surrounding brain parenchyma and could not be precisely delineated. The colour-coded imaging made possible depicting the image of the vessel loops in the @entity2758 nidus. In two other @entity1 the presence of @entity2695 was confirmed by blood flow disturbances in the feeder vessel: increased blood flow, decreased pulsatility and resistance indices, and collateral circulation. Collateralization by the contralateral internal carotid artery via the anterior communicating artery was disclosed in 9 cases. The TCCS results corresponded closely to angiographic findings. Collateral circulation via the posterior communicating artery ipsilateral to the @entity2758 was found in 3 of 5 @entity1 in whom it was diagnosed in cerebral angiography. Doppler findings in the @entity1 were similar to the conventional TCD examination. In the feeding vessels significant increase in blood flow velocity and decreased pulsatility and resistance indices was observed. RFV value for the end diastolic velocity was higher than RFV for the peak systolic velocity (p < 0.001) and mean velocity. These findings suggest that the increased end diastolic velocity in the feeding vessel is higher than the mean velocity and peak systolic velocity. It is thought that the TCCS can be successfully used in early diagnosis of @entity4798 and as an instrument in follow-up examination.
