title: Accuracy of pulse oximeter perfusion index in thoracic epidural anesthesia under basal general anesthesia.
abstract: OBJECTIVE
  To observe the change of PVI after thoracic epidural block on the basis of general anesthesia.
  
  
  METHODS
  In 26 patients undergoing elective upper abdominal operations, changes of SVI, PVI, SVV, PPV and CVP were monitored immediately before and 10 minutes after T8-9 thoracic epidural anesthesia on the basis of general anesthesia. The definition was that patients with ΔSVI greater than 10% belonged to response group to epidural block.
  
  
  RESULTS
  Before epidural block, the PVI, SVV and PPV baseline values in patients of response group were significantly higher than those in patients of non-response group. PVI, SVV and PPV after epidural block were significantly higher than immediately before epidural block (P < 0.001). PVI, SVV and PPV baseline values immediately before epidural block were positively correlated with ΔSVI; the correlation coefficients were 0.70, 0.71 and 0.63, respectively, P ≤ 0.001. The optimal critical values for PVI, SVV and PPV to predict response to T8-9 gap epidural block under general anesthesia were 16% (sensitivity 80%, specificity 92%), 13% (sensitivity 90%, specificity 62%) and 12% (sensitivity 90%, specificity 77%), respectively.
  
  
  CONCLUSIONS
  PVI can be used as a noninvasive indictor to monitor volume change after thoracic epidural block on the basis of general anesthesia.
authors.affiliation: Department of Anesthesiology, International Peace Maternal and Child Health Hospital, Shanghai Jiaotong University China.
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Department of Anesthesiology, Shanghai First People's Hospital, Shanghai Jiaotong University Shanghai, China.
authors.forename: Jianhai
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Anesthesiology, Shanghai First People's Hospital, Shanghai Jiaotong University Shanghai, China.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Xia
authors.affiliation: Department of Anesthesiology, Changhai Hospital, Second Military Medical University Shanghai, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Deng
keywords: Pleth variability index; combined general; pulse pressure variation; stroke volume variation; thoracic epidural anesthesia