On the SSEP, which electrode position records a spinal cord response?

The electrode position that records a spinal cord response during a Somatosensory Evoked Potential (SSEP) recording is at T12. This is because the T12 electrode is placed over the thoracic spine, allowing for the detection of neural activity associated with spinal cord responses to sensory stimuli. In the context of SSEP, this level is valuable for assessing the integrity of spinal cord pathways, particularly those associated with the lower extremities.

The T12 electrode is positioned to capture signals that reflect the response of spinal cord structures, assisting in monitoring for any potential injury or disruption in neural pathways during surgery. This is crucial in intraoperative monitoring as it provides real-time feedback on the functioning of the spinal cord.

The other electrode positions, such as CPz, the iliac crest, and the popliteal fossa, are associated with different types of responses. CPz is typically used for cranial responses and is more representative of cerebral activity rather than spinal responses. The iliac crest may be linked to lower body responses but is not specifically for spinal cord monitoring. The popliteal fossa, while relevant for recording peripheral responses, does not directly reflect spinal cord activity. Thus, T12 is the most appropriate position for capturing spinal cord responses