title: Comparison of abomasal luminal gas pressure and volume and perfusion of the abomasum in dairy cows with left displaced abomasum or abomasal volvulus.
abstract: OBJECTIVE
  To compare abomasal luminal gas pressure and volume and perfusion of the abomasum in dairy cows with a left displaced abomasum (LDA) or abomasal volvulus (AV).
  
  
  METHODS
  40 lactating dairy cows (25 with an LDA and 15 with an AV).
  
  
  METHODS
  Abomasal luminal gas pressure and volume and pulse oximetry values for the caudal portion of the dorsal ruminal sac and abomasal wall were measured during laparotomy. Abomasal perfusion was assessed on the basis of abomasal O2 saturation (pulse oximetry) before correction of the LDA or AV. Abomasal perfusion was also assessed after correction of the LDA or AV by measuring venous O2 saturation in the right gastroepiploic vein and calculating the abomasal oxygen-extraction ratio.
  
  
  RESULTS
  Abomasal luminal gas pressure and volume were higher in cattle with an AV than in cattle with an LDA. Abomasal O2 saturation was lower and abomasal oxygen-extraction ratio higher in cattle with an AV, compared with values in cattle with an LDA. In cows with an AV, lactate concentration in the gastroepiploic vein was greater than that in a jugular vein, whereas no difference in lactate concentrations was detected in cows with an LDA. Abomasal luminal gas pressure was positively correlated (r, 0.51) with plasma lactate concentration in the gastroepiploic vein and negatively correlated (r, -0.32) with abomasal O2 saturation determined by use of pulse oximetry.
  
  
  CONCLUSIONS
  Abomasal perfusion decreases as luminal pressure increases in cattle with an AV or LDA.
authors.affiliation: Medizinische Tierklinik der Universität Leipzig, Leipzig, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Wittek
authors.forename: Peter D
authors.initials: PD
authors.lastname: Constable
authors.forename: Manfred
authors.initials: M
authors.lastname: Fürll
mesh_terms: D000018:Abomasum / Q000098:blood supply* / Q000503:physiopathology; D000704:Analysis of Variance; D000818:Animals; D001774:Blood Chemical Analysis; D001784:Blood Gas Analysis; D002417:Cattle; D002418:Cattle Diseases / Q000503:physiopathology*; D019344:Lactic Acid / Q000097:blood; D007813:Laparotomy; D010092:Oximetry; D011312:Pressure; D012039:Regional Blood Flow; D013272:Stomach Diseases / Q000503:physiopathology / Q000662:veterinary*; D013277:Stomach Volvulus / Q000503:physiopathology / Q000662:veterinary*
chemical_list: D019344:Lactic Acid