Risk factors of insufficient baseline of somatosensory evoked potentials
Objective To analyze the risk factors of inadequate baseline somatosensory evoked potentials(SEPs)during sur-gery for lumbar spinal stenosis.Methods A retrospective analysis was conducted on 160 patients with lumbar spinal stenosis who underwent posterior lumbar decompression,fusion,and instrumentation surgery from January 2021 to December 2022.Pa-tient intraoperative SEP signal acquisition information and clinical data were collected.Preoperative patient characteristics(age,body mass index,gender,smoking history,history of hypertension,history of diabetes,lower limb neurological examination re-sults,lower limb swelling)were analyzed to determine the risk factors influencing inadequate baseline SEP signal during sur-gery.The patients were classified into reliable and unreliable groups based on whether the measured SEP signal baseline mini-mum amplitude was sufficient.Results Of the 160 patients included in the study,78 were in the reliable group and 82 were in the unreliable group.There were no statistically significant differences between the two groups in terms of age,body mass index,gender,smoking history,history of hypertension,history of diabetes,abnormal lower limb neurological examination results,and lower limb swelling(P＞0.05).However,in the univariate analysis,body mass index,smoking history,history of hypertension,ab-normal lower limb neurological examination results,and lower limb swelling showed statistically significant differences(P＜0.05).These factors were included in a multivariate regression analysis,which revealed that body mass index,abnormal lower limb neurological examination results,and lower limb swelling were statistically significant risk factors(P＜0.05).Conclusion In pa-tients with lumbar spinal stenosis,body mass index,lower limb neurological deficits,and lower limb swelling are risk factors for inadequate baseline SEPs during surgery.
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