title: The perfused swine uterus model: long-term perfusion.
abstract: BACKGROUND
  It has previously been shown that the viability of swine uteri can be maintained within the physiological range in an open perfusion model for up to 8 hours. The aim of this study was to assess medium- to long-term perfusion of swine uteri using a modified Krebs-Ringer bicarbonate buffer solution (KRBB) in the established open perfusion model.
  
  
  METHODS
  In an experimental study at an infertility institute, 30 swine uteri were perfused: group 1: n = 11, KRBB; group 2: n = 8, modified KRBB with drainage of perfusate supernatant; group 3: n = 11, modified KRBB with drainage of perfusate every 2 h and substitution with fresh medium. Modified and conventional KRBB were compared with regard to survival and contraction parameters: intrauterine pressure (IUP), area under the curve (AUC), and frequency of contractions (F).
  
  
  RESULTS
  Modified KRBB showed significantly higher IUP, AUC, and F values than perfusion with conventional KRBB. In group 3, the organ survival time of up to 17 h, with a 98% rate of effective contraction time, differed significantly from group 1 (P < 0.001).
  
  
  CONCLUSIONS
  Using modified KRBB in combination with perfusate substitution improves the open model for perfusion of swine uteri with regard to survival time and quality of contraction parameters. This model can be used for medium- to long-term perfusion of swine uteri, allowing further metabolic ex vivo studies in a cost-effective way and with little logistic effort.
authors.affiliation: Department of Gynecology, Erlangen University Hospital, Erlangen, Germany.
authors.forename: Klaudija
authors.initials: K
authors.lastname: Geisler
authors.forename: Julian
authors.initials: J
authors.lastname: Künzel
authors.forename: Philipp
authors.initials: P
authors.lastname: Grundtner
authors.forename: Andreas
authors.initials: A
authors.lastname: Müller
authors.forename: Matthias W
authors.initials: MW
authors.lastname: Beckmann
authors.forename: Ralf
authors.initials: R
authors.lastname: Dittrich
mesh_terms: D000818:Animals; D005260:Female; D066298:In Vitro Techniques; D007552:Isotonic Solutions / Q000737:chemistry; D023421:Models, Animal; D010477:Perfusion / Q000379:methods*; D011312:Pressure; D013552:Swine / Q000502:physiology*; D013997:Time Factors; D014590:Uterine Contraction / Q000502:physiology; D014599:Uterus / Q000502:physiology*
chemical_list: D007552:Isotonic Solutions; C051865:Krebs-Ringer solution