What is a defining feature of micro-embolic signals in TCD?

Micro-embolic signals (MES) in Transcranial Doppler (TCD) ultrasound are characterized by their short duration of less than 0.1 seconds. This feature is essential for distinguishing them from other types of signals that may be picked up during monitoring. The brief duration corresponds to the rapid transit of embolic material through the cerebral arteries, and it's this transient nature that allows for the identification of embolic events.

While other characteristics may be relevant in assessing various types of signals, the defining feature of micro-embolic signals relies heavily on their short duration. Understanding this aspect is crucial for clinicians when interpreting TCD results and differentiating true micro-embolic signals from other, potentially misleading signals that may appear in the TCD waveform. Proper identification is vital for making accurate intraoperative assessments and interventions related to cerebral blood flow and potential emboli.