title: The effect of body position, sedation, and thoracic bandaging on functional residual capacity in healthy deep-chested dogs.
abstract: The objective of this study was to determine the effect of body position, chest wrap, and sedation on functional residual capacity (FRC) in 6 healthy dogs. Functional residual capacity was determined by helium dilution (re-breathing) whilst in different clinically relevant conditions. These conditions included the standing (sternal) and lateral positions in unsedated dogs and then again both standing and lateral following chest bandaging, and sedation with acepromazine, IV and butorphanol, IV. The mean FRC at each measurement point was determined, as was the change in FRC (delta FRC) from one measurement point to another. Analysis of variance (ANOVA) with repeated measures with Fisher's LSD post hoc test was used to evaluate the effect of interventions. The differences in delta FRC were evaluated using a t-test or Wilcoxon rank-sum test. P < 0.05 was considered significant. The mean FRC at baseline, defined as standing, unsedated and unwrapped, was 75.3 +/- 23.8 mL/kg. Body position or sedation had the most profound effect on FRC with right lateral recumbency lowering FRC by a median of 20.4 mL/kg and sedation lowering FRC by a median of 19.8 mL/kg. Common clinical procedures and positioning result in lowered FRC in healthy deep-chested dogs. In critically ill or injured dogs, the iatrogenic loss of FRC through chest bandaging, sedation, or body position may be clinically relevant.
authors.affiliation: Lung Function Testing Laboratory, Cummings School of Veterinary Medicine, Tufts University, 200 Westboro Road, North Grafton, Massachusetts 01536, USA. Elizabeth.rozanski@tufts.edu
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Rozanski
authors.forename: Daniela
authors.initials: D
authors.lastname: Bedenice
authors.forename: Jennifer
authors.initials: J
authors.lastname: Lofgren
authors.forename: Julie
authors.initials: J
authors.lastname: Abrams
authors.forename: Jonathan
authors.initials: J
authors.lastname: Bach
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Hoffman
mesh_terms: D000075:Acepromazine / Q000008:administration & dosage; D000701:Analgesics, Opioid / Q000008:administration & dosage; D000758:Anesthesia; D000818:Animals; D014150:Antipsychotic Agents / Q000008:administration & dosage; D001458:Bandages; D002077:Butorphanol / Q000008:administration & dosage; D004285:Dogs; D005260:Female; D005652:Functional Residual Capacity / Q000502:physiology*; D007275:Injections, Intravenous; D008297:Male; D011187:Posture; D013909:Thorax
chemical_list: D000701:Analgesics, Opioid; D014150:Antipsychotic Agents; D000075:Acepromazine; D002077:Butorphanol