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      Congenital Nasolacrimal Duct Obstruction (CNLDO): A Review

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          Abstract

          Congenital nasolacrimal duct obstruction (CNLDO) is a common condition causing excessive tearing or mucoid discharge from the eyes, due to blockage of the nasolacrimal duct system. Nasolacrimal duct obstruction affects as many as 20% children aged <1 year worldwide and is often resolved without surgery. Available treatment options are conservative therapy, including observation, lacrimal sac massage and antibiotics, and invasive therapy. Observation, combined with conservative options, seems to be the best option in infants aged <1 year. Meanwhile, in children aged >1 year, nasolacrimal probing successfully addresses most obstructions. However, the most favorable timing for probing remains controversial. To alleviate persistent epiphora and mucous drainage that is refractory to probing, repeat probing, silicone tube intubation, balloon catheter dilation or dacryocystorhinostomy can be considered as available treatment options. Our review aims to provide an update to CNDO management protocols.

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          Most cited references80

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          Epiphora during the first year of life.

          A cohort of 4,792 infants was observed in order to determine the incidence and natural history of epiphora during the first year of life. Evidence of defective lacrimal drainage was present in 964 (20%) at some time during the year. 95% became symptomatic during the first month of life. Spontaneous remission occurred throughout the year and 96% had resolved before the age of one. This study provides no evidence to support probing before the age of one year.
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            Timing of initial probing and irrigation in congenital nasolacrimal duct obstruction.

            A series of 427 patients with congenital dacryostenosis involving 572 eyes was seen at the Children's Hospital of Philadelphia. All patients were treated conservatively with antibiotics and massage prior to decision by the parents to request probing. Congenital dacryostenosis, as well as resolution of symptoms, were confirmed by clinical examination and use of a modified dye disappearance test. In 572 eyes, the success rate of initial probing was found to be 97% under 13 months of age. Over 13 months, however, the mean success rate was found to be 54.7%. When broken down into smaller age categories, a stepwise progression was observed from 76.4% between 13 and 18 months to 33.3% for patients probed after 24 months. In addition, the number and complexity of subsequent procedures appeared to increase along with the age at which the initial probing was performed. These data suggest that initial probing should be done prior to 13 months of age depending on the severity of symptoms and parent compliance with medical management.
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              Late and very late initial probing for congenital nasolacrimal duct obstruction: what is the cause of failure?

              To find the cure rate of late (second year of age) and very late (3-5 years of age) initial probing for congenital nasolacrimal duct obstruction (CNLDO) and to identify the factors contributing to the failure rate of the probing in older children. In a prospective interventional case series study, 169 eyes of 125 consecutive patients (1-5 years old) with CNLDO underwent probing under general anaesthesia. Cure was defined as absence of tearing and discharge in the affected eye. 138 eyes of 101 patients aged 13-60 months (mean 23.4 (SD 10.2)) were included. Of 15 eyes (10.8%) with complex CNLDO, 80% presented after 24 months of age (p<0.0001). The cure rate was 89% in patients 13-24 months of age and 72% after the age of 24 months (p = 0.01). It was 90.2% in the membranous and 33.3% in the complex CNLDO in both late and very late probing (p<0.0001). There was a high correlation (r = 0.97) and no significant difference between the cure rate at 1 week and final follow up. Accumulation of the complex CNLDO is the main risk factor for failure of probing in the older children. The outcome of the nasolacrimal duct probing at 1 week follow up is highly indicative of the final outcome.
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                Author and article information

                Journal
                Diseases
                Diseases
                diseases
                Diseases
                MDPI
                2079-9721
                22 October 2018
                December 2018
                : 6
                : 4
                : 96
                Affiliations
                [1 ]Eye Clinic of Genoa, Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), University of Genova, 16132 Genova, Italy; mc8620@ 123456mclink.it
                [2 ]IRCCS Ospedale Policlinico San Martino, 16132 Genova, Italy
                [3 ]School of Medicine and Pharmacy, Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), University of Genoa, 16132 Genoa, Italy; lorenzoferrodes@ 123456gmail.com
                [4 ]University Eye Clinic San Giuseppe Hospital, University of Milan, 20162 Milano, Italy; paolo.nucci@ 123456unimi.it (P.N.); massimiliano.serafino@ 123456multimedica.it (M.S.); andrealembo1984@ 123456hotmail.com (A.L.)
                [5 ]Ophthalmology Unit, Department of Experimental Diagnostic and Specialty Medicine (DIMES), University of Bologna, S. Orsola-Malpighi Teaching Hospital, 40138 Bologna, Italy; giuseppe.giannaccare@ 123456gmail.com
                Author notes
                [* ]Correspondence: aldo.vagge@ 123456unige.it ; Tel.: +39-010-3538491; Fax: +39-353-8494
                Author information
                https://orcid.org/0000-0001-7232-6593
                Article
                diseases-06-00096
                10.3390/diseases6040096
                6313586
                30360371
                60fb3c9b-7816-4af0-bf7c-938e54838caa
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 30 August 2018
                : 17 October 2018
                Categories
                Review

                congenital nasolacrimal duct obstruction,lacrimal apparatus,tears

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