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Clinical Applications - Microembolus Detection

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Transcranial Doppler is a very efficient tool for emboli detection, the emboli are detected as HITS- high intensity transient signal. HITS are short high intensity patterns that move in the same direction as the blood flow in oppose to artifacts. It is moving inside the spectrum, and it is usually accompanied by a "chirp", "snap", or "moan sound. It is recommended to decrease the gain amplitude and sample volume to detect the HITS more accurately.

There are two different types of emboli, gaseous or solid. Gaseous emboli like air bubbles for example can be absorbed and metabolized through the capillaries which make them less dangerous, and less risk for stroke than solid emboli like pieces of plaque that have high risk for causing stroke.

Since cerebral embolism is one of the major reasons for ischemic stroke and since the main cause for intraoperative strokes especially during vascular procedures is embolism, the transcranial Doppler has an important and significant role for detecting emboli for patients who suffer from carotid atherosclerosis, patients who are undergoing carotid surgery, and cardiac surgery during all stage of the operation (pre/intra/postoperative) in order to reduce significantly the risk for stroke.

Digi-Lite TCD with its advanced and innovative monitoring and emboli detection software enables high accuracy detection and counting of emboli. Thanks to the monitoring multi-gate feature it is much easier to distinguish between emboli HITS and artifacts and edit them in our post processing modification feature.

                        Emboli

                       Figure 1: 2 emboli moving in the right MCA