title: [Accuracy and related affecting factors of somatosensory evoked potential monitoring in cervical and thoracic surgery].
abstract: OBJECTIVE
  To evaluate the accuracy and related affecting factors of the intra-operative somatosensory evoked potential monitoring in cervical and thoracic surgery.
  
  
  METHODS
  Cortical somatosensory evoked potential (CSEP) monitoring and sub cortical somatosensory evoked potential (Sub-CSEP) monitoring were performed in cervical and thoracic surgery. Somatosensory evoked potential (SEP) changes were recorded during anaesthesia and operation and postoperative, which could be used to evaluate accuracy of SEP.
  
  
  RESULTS
  Bilateral CSEP wave abnormalities were related to anaesthesia, decreasing wave amplitudes did not reach the alarming standard. Intra-operative manipulation to affect spinal cord would influence iso-lateral wave abnormality of CSEP and sub-CSEP, decreasing amplitudes reached the alarming standard. Local hypothermia such as cold water irrigating spinal cord would be to prolong the latent period. Low mean arterial pressure (MAP) mostly influenced amplitudes. Changes of SEP in local hypothermia and MAP did not reach the alarming standard.
  
  
  CONCLUSIONS
  CSEP and Sub CSEP can reflex physiopathological condition of spinal cord, it is useful in evaluating spinal cord function and providing the safety for cervical and thoracic surgery.
authors.affiliation: Institude of Traumatology & Orthopaedics Research Institute, Affiliated Hospital of Medical College, Qingdao University, Qingdao 266003, China. zonghuaq@126.com
authors.forename: Zong-Hua
authors.initials: ZH
authors.lastname: Qi
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Xi
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: De-Chun
authors.initials: DC
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D000758:Anesthesia; D002574:Cervical Vertebrae / Q000601:surgery*; D005073:Evoked Potentials, Somatosensory; D005260:Female; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D015203:Reproducibility of Results; D013119:Spinal Cord Injuries / Q000209:etiology / Q000517:prevention & control; D013904:Thoracic Vertebrae / Q000601:surgery*