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Intraspinal evoked potentials during clamping and declamping of the aorta

Iida, H.; Tanahashi, T.; Ishiyama, T.; Uematsu, H.; Yamamoto, M.

Masui. Japanese Journal of Anesthesiology 36(4): 498-504

1987

ISSN/ISBN: 0021-4892
PMID: 3613061
Document Number: 299582
Various sensory evoked potentials are now used for spinal function monitor during surgery which requires aortic clamping. We studied the changes of ascending and descending intraspinal evoked potentials caused by clamping of the descending aorta between left subclavian artery and first intracostal artery in twelve dogs. Ascending intraspinal evoked potentials (AIEP) disappeared earlier by clamping of the aorta and appeared slower by declamping of the aorta compared with descending intraspinal evoked potentials (DIEP). This fact reveals that AIEP reflects the ischemic state well in this model. Intraspinal evoked potential is easier, more reproducible and more accurate than the other sensory evoked potnetials as a spinal function monitor. We conclude that AIEP and DIEP by the bipolar electrode inserted to the epidural space are very useful as a spinal function monitor during surgery.

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