Figure 3.

Transcranial Doppler ultrasound (TCD) results from the ipsilateral left middle cerebral artery (MCA). Prior to the intervention there was normal arterial flow in the left MCA (A). Five embolic showers were observed after the stent was deployed (B). The blood flow decreased during the post-dilation of the lesion (C). Seven embolic showers were observed immediately after the post-dilation (C, D). This suggests that the distal filter device might not have provided complete protection from emboli. The flow in the left MCA remained reduced after the post-dilation, which very likely occurred when the protection filter became obstructed by the embolized debris (E). The arterial flow in the left MCA subsequently returned to normal immediately after the distal protection filter was removed (F)