SCIENTIFIC CORRESPONDENCE External dacryocystorhinostomy for the treatment of acquired partial nasolacrimal obstruction in adults

Aim: To determine the long term success of external dacryocystorhinostomy (DCR) in adults with acquired partial nasolacrimal obstruction. Methods: A retrospective study of 50 external dacryocystorhinostomies with silicone intubation performed for partial nasolacrimal obstruction, was undertaken. Preoperative lacrimal scintigraphy divided drainage abnormalities into presac or postsac delays. Postoperative success was determined by lacrimal patency to irrigation, a positive dye test on nasal endoscopy and subjective resolution of epiphora. Statistical analysis was performed using the Fisher exact test. Results: A patent DCR system to irrigation and a positive dye test was achieved in 90% of procedures. At an average of 3.6 months’ follow up, subjective success was reported in 84% of cases—91% for postsac and 67% for presac delays. At 3 years’ follow up success had declined to 70% overall and to 80% and 47% for postsac and presac occlusions respectively. There was a statistically significant association between a presac delay and postoperative recurrence of epiphora, p = 0.04. Conclusion: External DCR with silicone intubation is an effective procedure for partial nasolacrimal obstruction. Presac delays do significantly less well and further studies are necessary to evaluate the best type of surgery for these patients.