Key points The incidence of postoperative motor deficits was significantly higher (p<0.05) among patients with thoracic lesion (8/14: 57%) than among patients with cervical lesions (5/23: 22%). We were able to detect transient postoperative motor deficits with TcMEP monitoring and its cutoff amplitude was identified as 12% residual of baseline with sensitivity/specificity being 86%/74%. When divided into cervical and thoracic lesions, cutoff amplitude was 15% and 9%, respectively. Different alarm criteria maybe needed for cervical and thoracic IMSCT surgery.
5.2% (sensitivity 71%, specificity 86%) 0.2 0.60.40.8 0.6 0.4 0.2 12% (sensitivity 86%, specificity 74%) 9.0% (sensitivity 80%, specificity 79%) sensitivity specificity A 15% (sensitivity 90%, specificity 67%) ROC analysis identifying cutoff TcMEP amplitude in IMSCT surgery including 280 muscles in 37 surgeries B p<0.05 Incidence of postoperative motor deficits in cervical and thoracic IMSCT (number of surgeries) (22%) (57%) IMSCT; intramedullary spinal cord tumor, PMD; postoperative motor deficit, ROC; receiver operating characteristic, TcMEP; transcranial motor evoked potential,
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