During a carotid endarterectomy (CEA), what are the suggested EEG filter, time-base, and sensitivity settings for monitoring cortical ischemia?

The response indicating the suggested EEG filter, time-base, and sensitivity settings for monitoring cortical ischemia during a carotid endarterectomy is supported by established practices in intraoperative neurophysiological monitoring. Specifically, the bandwidth of 0.3-70 Hz captures the essential frequency range for detecting cortical ischemia, as this range includes critical components of brain activity that may be affected during surgical procedures involving the carotid artery.

Using a time-base of 15 mm/s is appropriate to allow adequate visualization of the EEG waveform without excessive compression or stretching, ensuring that any significant changes indicative of ischemia can be interpreted effectively. Additionally, a sensitivity setting of 3 µV/mm provides a balance that allows for the detection of subtle changes in cortical activity without overwhelming the monitor with excessive noise or artifacts.

These settings are optimized to monitor changes in EEG that may signal cortical ischemia, which is critical during procedures like carotid endarterectomy where blood flow may be temporarily disrupted. The chosen parameters facilitate accurate interpretation while maintaining a suitable level of detail in the EEG trace, crucial for timely interventions if ischemia is detected.