New Alert Criteria for Intraoperative Somatosensory Evoked Potential Monitoring

Forty years ago, anesthesiologist Betty Grundy and engineer Richard Brown, working with spine surgeon Clyde Nash, began recording somatosensory evoked potentials (SEPs) from the scalp during spine surgery. Their goal was to identify SEP changes in time to avert post-operative neurologic impairment. Their early methods were crude by today's standards. They measured 512 msec long-latency SEPs with filters 1-100 Hz. They followed scalp signals' presence or absence without identifying particular peaks of interest.

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