title: Comparison of thoracic and abdominal cavity volumes during abdominal CO2 insufflation and abdominal wall lift.
abstract: OBJECTIVE
  To compare thoracic and abdominal cavity volumes during abdominal CO2 insufflation and abdominal wall lift (AWL) conditions.
  
  
  METHODS
  In vitro cadaveric study.
  
  
  METHODS
  Mature medium-to-large breed fresh canine cadavers (n = 6).
  
  
  METHODS
  Each cadaver was imaged with computed tomography (CT) under baseline, abdominal CO2 insufflation, and AWL conditions. Measurements of thoracic and abdominal cavities were performed for each condition using image-analyzing software. Resulting volumes for each cadaver were converted to percent change from baseline to normalize the data. The t-tests were used to compare percent changes of both thoracic and abdominal volumes.
  
  
  RESULTS
  Thoracic volume significantly decreased from baseline during CO2 insufflation (P < .01). No significant difference in thoracic volume occurred with AWL when compared with baseline. Abdominal volume increased by 80% with CO2 insufflation (95% CI: 56.4-107.0%) but only 25% with AWL (95% CI: 12.3-37.8%).
  
  
  CONCLUSIONS
  Abdominal CO2 insufflation results in decreased thoracic volume when compared with baseline. AWL preserved thoracic volume similar to baseline. Abdominal volumes achieved with abdominal CO2 insufflation are significantly greater than those attained with AWL.
authors.affiliation: Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA.
authors.forename: Courtney
authors.initials: C
authors.lastname: Watkins
authors.forename: Boel A
authors.initials: BA
authors.lastname: Fransson
authors.forename: Claude A
authors.initials: CA
authors.lastname: Ragle
authors.forename: John
authors.initials: J
authors.lastname: Mattoon
authors.forename: John M
authors.initials: JM
authors.lastname: Gay
mesh_terms: D034861:Abdominal Wall; D000818:Animals; D002102:Cadaver; D002245:Carbon Dioxide; D004285:Dogs; D007327:Insufflation
chemical_list: D002245:Carbon Dioxide