title: In vitro mitomycin C absorption and delivery with different sponge materials used in filtering surgery.
abstract: OBJECTIVE
  The purpose of this study is to evaluate and compare mitomycin C (MMC) absorption and delivery in different materials used in filtering surgery.
  
  
  METHODS
  This is an in vitro study comparing polyvinyl alcohol triangular sponges (TS6, TS8), polyvinyl alcohol fluid wicks (EFW), and absorbable gelatin sponges (AGS3, AGS5), from which five different types of transport units were obtained. Seven pieces of sponge of each transport unit type were obtained as follows: two transverse strips were obtained at 6 and 8 mm from the apex of TS and divided into three equal pieces; 4×4 mm pieces of EFW; 3×3 and 5×5 mm pieces of absorbable gelatin sponges were cut. Filter paper was placed on a precision scale (0.01 mg). The seven sponge pieces of each type were weighed three times consecutively in dry and wet states, the latter after immersion for 15 seconds in 0.2 mg/mL MMC. The difference between the weights of the dry and wet filter paper at the end of each measurement sequence was also calculated and considered as an estimate of the amount of mitomycin delivered.
  
  
  RESULTS
  The amounts of MMC absorbed by each transport unit were as follows: (mean ± standard deviation) 27.43±5.13 for TS6, 31.91±6.63 for TS8, 15.96±2.23 for EFW, 17.96±2.05 for AGS3, and 33.81±2.05 for AGS5. The amounts of MMC delivered to the filter paper were as follows: 21.70±2.84 for TS6, 23.83±4.03 for TS8, 12.93±1.75 for EFW, 14.69±1.79 for AGS3, and 27.30±1.58 for AGS5.
  
  
  CONCLUSIONS
  Percentage MMC delivered was similar for all materials, but there was a tendency for greater delivery using larger sponges and greater homogeneity in delivery with AGS5. No statistical differences were found in percentage delivered by the different transport materials.
authors.affiliation: Department of Ophthalmology, Institut Català de Retina, Barcelona, Spain.
authors.forename: Diana
authors.initials: D
authors.lastname: Urbaneja
authors.affiliation: Department of Ophthalmology, Institut Català de Retina, Barcelona, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Morilla-Grasa
authors.affiliation: Department of Ophthalmology, Institut Català de Retina, Barcelona, Spain.
authors.forename: Elisa
authors.initials: E
authors.lastname: Jimenez
authors.affiliation: Department of Ophthalmology, Institut Català de Retina, Barcelona, Spain.
authors.forename: Judith
authors.initials: J
authors.lastname: Montemayor
authors.affiliation: Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain.
authors.forename: Nuria
authors.initials: N
authors.lastname: Marcobal
authors.affiliation: Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain.
authors.forename: Carme
authors.initials: C
authors.lastname: Aragay
authors.affiliation: Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain.
authors.forename: Celia
authors.initials: C
authors.lastname: Gurdiel
authors.affiliation: Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Armillas
authors.affiliation: Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain.
authors.forename: Pere
authors.initials: P
authors.lastname: Ortiz
authors.affiliation: Department of Ophthalmology, Institut Català de Retina, Barcelona, Spain; Department of Ophthalmology, Hospital Ntra Sra De La Esperanza - Parc de Salut Mar, Barcelona, Spain; Universitat Internacional de Catalunya, Barcelona, Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Antón
keywords: absorbable gelatin sponges; glaucoma; mitomycin; polyvinyl alcohol