Detection of Middle Cerebral Emboli During Coronary Artery Bypass Surgery Using Transcranial Doppler Sonography To the Editor: Spencer et al recently described the use of transcranial Doppler sonography to record the passage of emboli through the middle cerebral artery (MCA) during carotid endarterectomy. They recorded transient signals at the time of releasing common carotid cross clamps and i...

BACKGROUND AND PURPOSE Our purpose was to show changes in the diameter of the M1 segment of the middle cerebral artery (MCA) by using high-resolution MR imaging in patients with chronic internal carotid artery occlusion after IV administered acetazolamide challenge. Changes in blood flow velocity of the basal cerebral arteries are thought to correlate with changes of cerebral blood flow. Change...

BACKGROUND AND PURPOSE We sought to identify the use of duplex and transcranial Doppler sonography in the noninvasive diagnosis of vertebral dissection. METHODS Ten patients with a diagnosis of symptomatic vertebral artery dissection confirmed by cerebral angiography were retrospectively analyzed. RESULTS Computed tomographic scanning and magnetic resonance imaging together delineated later...