Spontaneous ventilation during positive pressure ventilation was observed in a 4-year-old DSH cat maintained under general anesthesia with isoflurane delivered with a nonrebreathing system. This was accompanied by an increase in heart rate and blood pressure. On investigation, neither an inadequate plane of anesthesia, nor hypoxemia, nor hyperthermia was present. The nonrebreathing system was replaced and the hypercapnia resolved. A defect in the inner fresh gas delivery tube of the Bain system was identified. A simple and quick test is described which can be performed to verify the integrity of the inner tube of the Bain breathing circuit.
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| http://dx.doi.org/10.1111/j.1467-2987.2004.00136.x | DOI Listing |
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