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Cerebral Embolism and Doppler Ultrasound

Physicians caring for patients with cerebrovascular disease have been hearing in recent years about the ability of transcranial Doppler (TCD) ultrasound to identify high-intensity transient signals (HITS) said to be due to microemboli. However, the value of identifying these signals in caring for patients has been controversial. We asked three of the authorities whose opinion would be valued to offer their opinion about the importance of HITS. What is their meaning in stroke? We informed each contributor that we do not expect new data, detailed analyses, or an authoritative review. Rather, we wanted their concise views on the subject. Their opinions follow.