title: [The effect of needleless electroacupuncture in general anesthesia during laparoscopic surgery].
abstract: BACKGROUND
  Three kinds of pain-relieving substances, namely, endorphins, enkephalins and dynorphins, can be released by stimulating the relevant acupoints with the dense-disperse mode of nerve stimulator. The neurochemical mechanisms of pain relief by acupoint stimulation have been widely studied and proved. In the present study, we investigated the modulatory effect of needleless electroacupuncture on the inhaled general anesthesia during laparoscopic surgery.
  
  
  METHODS
  Forty gynecologic patients of ASA class I-II status, scheduled for elective laparoscopic surgery, were randomly allocated to study and control groups. Induction and intubation were performed in the same fashion and anesthesia was maintained with inhaled general anesthetics: 50% N2O in oxygen and isoflurane, which was adjusted to keep the hemodynamic changes within +/- 10% of their preoperated level. HANS (LY 257), a special nerve stimulator with 2 Hz and 100 Hz dense-disperse wave, was used to stimulate the bilateral Yang Ling Chuan (G34), Zusanli (S36) acupoints in patients of the study group during the surgery.
  
  
  RESULTS
  We found that needleless electroacupuncture significantly lowered the volume concentration of isoflurane from 1.0 +/- 0.33% to 0.74 +/- 0.19% (p < 0.05) at 30 min after the start of operation. Furthermore, it also significantly shortened the recovery time from 11.4 +/- 3.3 min to 8.8 +/- 3.2 min (p < 0.05).
  
  
  CONCLUSIONS
  Under general anesthesia, the application of needleless electroacupuncture can reduce the volume concentration of isoflurane and shorten the post-anesthetic recovery time during laparoscopic surgery.
authors.affiliation: Department of Anesthesiology, National Cheng Kung University and Hospital, Tainan, Taiwan, R.O.C.
authors.forename: M H
authors.initials: MH
authors.lastname: Chiang
authors.forename: J O
authors.initials: JO
authors.lastname: Wong
authors.forename: D P
authors.initials: DP
authors.lastname: Chang
authors.forename: Y B
authors.initials: YB
authors.lastname: Dai
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
authors.forename: S C
authors.initials: SC
authors.lastname: Lee
authors.forename: C L
authors.initials: CL
authors.lastname: Chang
mesh_terms: D000328:Adult; D000768:Anesthesia, General; D015671:Electroacupuncture; D005260:Female; D006439:Hemodynamics; D006801:Humans; D007530:Isoflurane / Q000008:administration & dosage; D010535:Laparoscopy
chemical_list: D007530:Isoflurane