Monitoring myogenic motor EPs after transcranial electrical stimulation is effective in detecting spinal cord ischemia. During thoracoabdominal aortic aneurysm surgery, this technique is sufficiently rapid to allow timely interventions aimed at correcting ischemic conditions and preserving spinal cord blood flow. If strategies are applied to protect the spinal cord during thoracoabdominal aortic aneurysm repair (e.g., distal bypass, cerebrospinal fluid drainage, reattachment of segmental arteries), motor EP monitoring should be included in this protocol to improve neurologic outcome further. Although SSEPs provide information regarding the adequacy of spinal cord blood flow, monitoring SSEPs during thoracoabdominal aortic aneurysm repair has serious limitations. The response time is too slow to be of practical use. SSEPs also do not provide information regarding anterior horn motor function and supply, whereas the motor neurons in the anterior horn are most likely to sustain ischemic injury.
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