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The monitoring of somatosensory evoked potentials and neurologic complications in aneurysm surgery

 Kyeong Tae Min  ;  Jong Hoon Kim  ;  Yong Sam Shin  ;  So Young Kwon  ;  Yong Taek Nam 
 YONSEI MEDICAL JOURNAL, Vol.42(2) : 227-232, 2001 
Journal Title
Issue Date
Adult ; Evoked Potentials, Somatosensory/physiology* ; Female ; Humans ; Intracranial Aneurysm/surgery* ; Male ; Middle Aged ; Monitoring, Physiologic* ; Nervous System Diseases/diagnosis* ; Nervous System Diseases/etiology* ; Nervous System Diseases/physiopathology ; Surgical Procedures, Operative/adverse effects*
somatosensory evoked potentials ; cerebral aneu-rysm surgery
Somatosensory evoked potential (SSEP) changes during cerebral aneurysm surgery and their relationship to postoperative neurologic complications have been studied on many occasions. However, it is still a matter of debate whether SSEP monitoring is really helpful in detecting or preventing neurologic complications. We studied 87 patients undergoing aneurysm surgery of the anterior cerebral circulation and SSEPs were monitored in 60 of these patients. All patients were grade 2 by the subarachnoid hemorrhage (SAH) grading system. Median nerve SSEP was monitored for middle cerebral or internal carotid artery aneurysms and posterior tibial nerve SSEP for anterior cerebral artery aneurysms. A decrease in the cortical amplitude of more than 50%, compared with control, was considered significant and interventions were then taken to reverse the SSEP. The pre- and postoperative neurologic deficits of each patient were evaluated immediately before and after surgery. No significant difference was found in the incidence of postoperative neurologic complications in the SSEP monitored (15% [9/60]) and unmonitored patients (22% [6/27]). In the SSEP monitored patients, the amplitudes of SSEPs decreased significantly in 14 patients and 4 of these showed neurologic complications. However, SSEP amplitudes were not significantly changed in 46 patients, and 5 of these showed neurologic complications. Significant changes in the amplitude of SSEP might represent neuronal injury, but the absence of change in the SSEP cannot guarantee patient safety. Our results suggest that SSEP monitoring may be useful for detecting the danger of neuronal injury, but that it does not reduce the incidence of neurologic complications in aneurysm surgery.
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1. College of Medicine (의과대학) > Dept. of Anesthesiology and Pain Medicine (마취통증의학교실) > 1. Journal Papers
Yonsei Authors
Min, Kyeong Tae(민경태) ORCID logo https://orcid.org/0000-0002-3299-4500
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