title: The length of unsutured mucosal margins in external dacryocystorhinostomy.
abstract: OBJECTIVE
  To compare the extent of mucosal margins remaining unsutured at the end of external dacryocystorhinostomy (DCR) using single or double flap techniques and to evaluate the influence on outcome.
  
  
  METHODS
  Prospective, consecutive case series.
  
  
  METHODS
  The number and length of mucosal margins remaining unsutured at the end of external DCR were evaluated in 64 patients. Mucosal anastomosis was performed using either a conservative (group 1) or extended (group 2) double flap, or a single flap (group 3) dissection. Patients were selected for group 1 if the regional anatomy permitted the desired dissection. All other patients were randomized to group 2 or 3. The mean length of unsutured mucosal margins was calculated for each group. Subjects were followed up to 12 months, with final success rate recorded.
  
  
  RESULTS
  In groups 1, 2, and 3 respectively: 11, 24 and 29 patients were recruited; four, 12, and 10 mucosal margins remained unsutured; and the mean length of unsutured mucosal margins was 16.36 mm (SD = 2.8), 70.66 mm (SD = 9.3), and 62.00 mm (SD = 6.0). The mean length of unsutured mucosal margins was significantly different, although groups 1 and 2 collectively did not have a significantly different mean length of unsutured mucosal margin from group 3. Mean follow-up was 11 months (SD = 2.2), 63 patients (98.43%) had a successful outcome with no significant difference among groups (P = .429).
  
  
  CONCLUSIONS
  Different patterns of mucosal dissection in external DCR create a different number and extent of unsutured mucosal margins which do not appear to adversely affect the success rate of external DCR.
authors.affiliation: Orbital Center, Department of Ophthalmology, University of Amsterdam, Amsterdam, The Netherlands. l.baldeschi@amc.uva.nl
authors.forename: Lelio
authors.initials: L
authors.lastname: Baldeschi
authors.forename: Kerr
authors.initials: K
authors.lastname: Macandie
authors.forename: Christoph R
authors.initials: CR
authors.lastname: Hintschich
mesh_terms: D003608:Dacryocystorhinostomy / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009297:Nasal Mucosa / Q000601:surgery*; D009301:Nasolacrimal Duct / Q000601:surgery*; D011446:Prospective Studies; D013524:Surgical Flaps; D013536:Suture Techniques