Comparison of Single and Dual Monitoring during Carotid Endarterectomy
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- UNO Masaaki
- Department of Neurosurgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- YAGI Kenji
- Department of Neurosurgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- TAKAI Hiroyuki
- Department of Neurosurgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- OYAMA Naoki
- Department of Stroke Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- YAGITA Yoshiki
- Department of Stroke Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- HAZAMA Keita
- Department of Anesthesiology and Intensive Care Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- NAKATSUKA Hideki
- Department of Anesthesiology and Intensive Care Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan
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- MATSUBARA Shunji
- Department of Neurosurgery, Kawasaki Medical School, Kurashiki, Okayama, Japan
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Abstract
<p>We compared the rate of selective shunt and pattern of monitoring change between single and dual monitoring in patients undergoing carotid endarterectomy (CEA). A total of 121 patients underwent 128 consecutive CEA procedures. Excluding five procedures using internal shunts in a premeditated manner, we classified patients according to the monitoring: Group A (n = 72), patients with single somatosensory evoked potential (SSEP) monitoring; and Group B (n = 51), patients with dual SSEP and motor evoked potential (MEP). Among the 123 CEAs, an internal shunt was inserted in 12 procedures (9.8%) due to significant changes in monitoring (Group A 5.6%, Group B 15.7%, p = 0.07). The rate of shunt use was significantly higher in patients with the absence of contralateral proximal anterior cerebral artery (A1) on magnetic resonance angiography (MRA) than in patients with other types of MRA (p <0.001). Significant monitor changes were seen in 16 (12.5%) in both groups. In four of nine patients in Group B, SSEP and MEP changes were synchronized, and in the remaining five patients, a time lag was evident between SSEP and MEP changes. In conclusion, the rate of internal shunt use tended to be more frequent in patients with dual monitoring than in patients with single SSEP monitoring, but the difference was not significant. Contralateral A1 absence may predict the need for a shunt and care should be taken to monitor changes throughout the entire CEA procedure. Use of dual monitoring can capture ischemic changes due to the complementary relationship, and may reduce the rate of false-negative monitor changes during CEA.</p>
Journal
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- Neurologia medico-chirurgica
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Neurologia medico-chirurgica 61 (2), 124-133, 2021
The Japan Neurosurgical Society