title: [A clinical research about the effect of vagus nerve block in cervical part to prevent Oculocardiac Reflex].
abstract: OBJECTIVE
  To investigate the preventive effect of vagus nerve block in cervical part on Oculocardiac Reflex (OCR).
  
  
  METHODS
  Case control study. 40 patients undergoing prosthesis of right orbital wall bone fracture were randomly divided into two groups: experiment group (group I) and control group (group II). Both of the group adopted vagus nerve block in cervical part before anesthesia. Group I accepted 1% lidocaine and group II received 0.9% Sodium Chloride. The same anesthesia method was applied on both groups. We recorded the index change of mean arterial pressure (MAP), heart rate (HR) and pulse oxygen saturation (SpO2) before (T(0)) and after vagus nerve block in cervical part 3 min (T(1)), 5 min (T(2)), 10 min (T(3)) and 120 min (T(4)); the changes of MAP and HR when we oppressed the eyeball or drag muscular apparatus; the times of using atropine; adverse reactions and the alteration of Acetylcholine (ACh). Numerical data was carried on statistical analysis processing using the SPSS 13.0. Data among groups were compared by t test and numeration data were compared by chi-square criterion. P-value < 0.05 was considered to be statistically significant.
  
  
  RESULTS
  In group I, we found that heart rate significantly increased after block 3 min to 120 min compared with before block (F = 15.46, P = 0.000); The incidence of OCR was lower, and the incidence of adverse effects in PACU such as nausea and vomiting had statistically significant (χ(2) = 8.28, P = 0.004); Content of ACh in group I changed significantly, it was lower after block than before block (t = 2.935, P = 0.003).
  
  
  CONCLUSIONS
  Vagus nerve block in cervical part significantly decreased the incidence of OCR and brought into preventive effect.
authors.affiliation: Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China.
authors.forename: Shu-zhen
authors.initials: SZ
authors.lastname: Wang
authors.forename: En-hua
authors.initials: EH
authors.lastname: Gu
authors.forename: Kang-kang
authors.initials: KK
authors.lastname: Zhang
authors.forename: Juan
authors.initials: J
authors.lastname: Zhao
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009333:Neck; D009407:Nerve Block / Q000009:adverse effects / Q000379:methods*; D013508:Ophthalmologic Surgical Procedures / Q000379:methods; D012024:Reflex, Oculocardiac; D014630:Vagus Nerve / Q000601:surgery*; D055815:Young Adult