title: Quantitative study of the effect of dacryocystorhinostomy on lacrimal drainage.
abstract: Using scintigraphy, we have studied the lacrimal drainage from the conjunctival sac of normal subjects and patients who have undergone dacryocystorhinostomy. A mathematical model of drainage was constructed that accurately described the complete activity curves for both groups. The initial rate of drainage was shown to be a relevant parameter to characterize drainage, and it was found to be different from normals to patients, indicating that the lacrimal pump mechanism is affected by dacryocystorhinostomy.
authors.affiliation: School of Medicine of Ribeirão Preto, University of São Paulo and Institute of Physics, Brazil.
authors.forename: J M
authors.initials: JM
authors.lastname: Malbouisson
authors.forename: M D
authors.initials: MD
authors.lastname: Bittar
authors.forename: H N
authors.initials: HN
authors.lastname: Obeid
authors.forename: F C
authors.initials: FC
authors.lastname: Guimarães
authors.forename: A A
authors.initials: AA
authors.lastname: Velasco e Cruz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D003608:Dacryocystorhinostomy; D006801:Humans; D007765:Lacrimal Apparatus / Q000000981:diagnostic imaging / Q000503:physiopathology*; D007766:Lacrimal Apparatus Diseases / Q000503:physiopathology* / Q000601:surgery; D008875:Middle Aged; D008962:Models, Theoretical; D011877:Radionuclide Imaging; D013666:Tears / Q000502:physiology*; D013667:Technetium; D016896:Treatment Outcome
chemical_list: D013667:Technetium