title: [Annular electrode lacrimal duct reconstruction for improving the safety and efficacy of lacrimal stent implantation: a randomized clinical trial].
abstract: OBJECTIVE
  To evaluate the effect of annular electrode lacrimal duct reconstruction in improving the safety and efficacy of nasolacrimal duct stent implantation for treatment of nasolacrimal duct obstruction.
  
  
  METHODS
  This randomized clinical trial was performed to compare the efficacy, success rate of intubation, time used for stent implantation, intraoperative pain, and extubation-assciated complications between nasolacrimal stent implantation with and without annular electrode lacrimal duct reconstruction.
  
  
  RESULTS
  A total of 119 eligible patients were enrolled in this trial. The total curative rate at 6 months of follow up after extubation was 70.9% (83/117) in these patients, and was significnatly higher in pateinets with lacrimal duct reconstruction than in those without [80.6% (54/67) vs 58.0% (29/50); χ(2)=7.093, P<0.05]. The total success rate of stent implantation was 98.3% (117/119) in all the patients initially enrolled, and two patients experienced failure of stent implantation and were excluded; the success rate was signfiicantly higher in patients initially enrolled in the lacrimal duct reconstruction group (χ(2)=6.282, P<0.05). The median time required for intubation was shorter in lacrimal duct reconstruction group (12 s vs 33 s; Z=-36.722, P<0.05). The intendity of intraoperative pain was comparable between the two groups (t=0.833, P=0.405). The total rate of puncta injury was 43.6% (51/117) in these patients and similar between the two groups (χ(2)=1.459, P=0.227). The total rate of extubation difficulty was 9.4% (11/117) in all the patients, and was lower in lacrimal duct reconstruction group [4.5% (3/67) vs 16% (8/50); χ(2)=4.463, P<0.05]. Stent breakage in extubation occurred in 4.3% (11/117) of the patients with similar rates between the two groups (χ(2)=2.964, P=0.085). Spearman bivariate correlation analysis showed that the time required for intubation was inversely correlated with the treatment efficacy (r=-0.584, P<0.05) and positively with the occurrence of extubation difficulty (r=0.491, P<0.05); extubation difficulty was inversely correlated with the curative effect (r=-0.511, P<0.05).
  
  
  CONCLUSIONS
  Annular electrode nasolacrimal duct reconstruction can increase the safety and efficacy of nasolacrimal duct stent implantation for treatment of nasolacrimal duct obstruction.
authors.affiliation: Southern Medical University, Guangzhou 510515, China.E-mail: yankehwx@163.com.
authors.forename: Wenxue
authors.initials: W
authors.lastname: Hu
authors.forename: Haike
authors.initials: H
authors.lastname: Guo
authors.forename: Hailan
authors.initials: H
authors.lastname: Liao
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Huang
mesh_terms: D003608:Dacryocystorhinostomy / Q000379:methods*; D004566:Electrodes; D006801:Humans; D007440:Intubation; D007767:Lacrimal Duct Obstruction; D009301:Nasolacrimal Duct / Q000601:surgery*; D010146:Pain; D019651:Plastic Surgery Procedures / Q000379:methods*; D015607:Stents; D016896:Treatment Outcome