MEPs vs SSEPs Spinal Cord Monitoring — FRCA Final MCQ

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HardNeuroanaesthesiaMEPs vs SSEPs Spinal Cord MonitoringFRCA Final

Which monitoring modality provides the earliest warning of spinal cord ischaemia during thoracoabdominal aortic surgery?

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Correct answer: B — Motor evoked potentials (MEPs)

MEPs monitor the anterior spinal cord (corticospinal motor tracts) and provide earlier detection of ischaemia than SSEPs (which monitor posterior columns/sensory pathways). Since the anterior cord is supplied by the single anterior spinal artery (most vulnerable to ischaemia), MEPs are more sensitive for detecting motor pathway compromise.

Reference: RCOA – 2023 – Neurophysiological monitoring during aortic surgery