Document Detail

Comparison between facemask and laryngeal mask airway in rabbits during isoflurane anesthesia.
MedLine Citation:
PMID:  16135209     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine whether a laryngeal mask airway (LMA) provides a better airway than a facemask in spontaneously breathing anesthetized rabbits, and to test if it can be used for mechanically controlled ventilation. STUDY DESIGN: Randomized prospective experimental trial. ANIMALS: Sixteen young, healthy, specific pathogen-free Giant Flemish cross Chinchilla rabbits (10 females and 6 males) weighing 4.1 +/- 0.8 kg. METHODS: Rabbits were assigned randomly to one of three treatment groups: facemask with spontaneous ventilation (FM-SV; n = 5), LMA with spontaneous ventilation (LMA-SV; n = 5), and LMA with controlled ventilation (LMA-CV; n = 6). In dorsal recumbency, and at 2.3% end-tidal isoflurane concentration, Fé isoflurane, Fi isoflurane, partial pressure of expired isoflurane (PECO(2)), partial pressure of inspired carbon dioxide (PiCO(2)), heart rate, respiratory rate, minute volume, arterial oxygen tensions (PaO(2)), arterial carbon dioxide tensions (PaCO(2)), arterial pH (pH(a)), arterial standard base excess (SBE(a)) values were measured for 120 minutes. Results Two individuals in the FM-SV group had PaCO(2) > 100 mm Hg. One rabbit in the FM-SV had PaO(2) < 80 mm Hg. All FM-SV rabbits showed signs of airway obstruction, and two were withdrawn from the study at 45 and 90 minutes, respectively, because cyanosis was observed. No signs of airway obstruction were observed in either LMA group. Four rabbits in the LMA-CV group developed gastric tympanism, one of which refluxed gastric contents after 110 minutes. There were no differences between FM-SV and LMA-SV in any variable tested. PaCO(2) and PECO(2) were decreased, while PaO(2) and minute volume were increased in the LMA-CV group compared to the LMA-SV group. CONCLUSIONS: An LMA provided a better airway than a facemask during spontaneous breathing in rabbits, as the use of a facemask was associated with hypercapnia and low partial pressures of oxygen. Although an LMA can be used for intermittent positive pressure ventilation (IPPV), gastric tympanism may develop, especially at a peak inspiratory pressure of 14 cm H(2)O. CLINICAL RELEVANCE: The LMA can be used in rabbits but further work is needed before it is applied routinely.
Leigh Bateman; John W Ludders; Robin D Gleed; Hollis N Erb
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Veterinary anaesthesia and analgesia     Volume:  32     ISSN:  1467-2987     ISO Abbreviation:  Vet Anaesth Analg     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-01     Completed Date:  2005-10-13     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  100956422     Medline TA:  Vet Anaesth Analg     Country:  England    
Other Details:
Languages:  eng     Pagination:  280-8     Citation Subset:  IM    
Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
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MeSH Terms
Anesthesia, General / veterinary*
Anesthetics, Inhalation / administration & dosage
Animals, Laboratory / physiology*
Isoflurane / administration & dosage
Laryngeal Masks / veterinary
Masks / veterinary*
Prospective Studies
Rabbits / physiology*
Specific Pathogen-Free Organisms
Treatment Outcome
Reg. No./Substance:
0/Anesthetics, Inhalation; 26675-46-7/Isoflurane

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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