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- Title
Isoflurane leakage from non-rebreathing rodent anaesthesia circuits: comparison of emissions from conventional and modified ports.
- Authors
J C Smith; B Bolon
- Abstract
Chronic exposure to low levels of fluorocarbon-based waste anaesthetic gas (WAG) has been linked to a multitude of human health problems. We have shown that isoflurane exhaust from passive gas-scavenging canisters is often quite high when using conventional rodent anaesthesia protocols and equipment. Another likely source of WAG build-up in rodent procedure rooms is leakage at the interface between the breathing circuit and the animal's face. We evaluated this possibility using three non-rebreathing circuits: traditional Bain, modified Bain, and Mapleson (type E). For the Mapleson E circuit, a conical rodent facemask was attached and used in one of two configurations: normal aperture, or aperture modified with a latex diaphragm (cut from an unpowdered surgical glove) to reduce the orifice diameter and tighten the seal. Adult female Sprague–Dawley rats were anaesthetized with isoflurane (5% for induction, 2% or 3.5% for maintenance) in oxygen (2 L/min for induction, 1 L/min for maintenance). Isoflurane leakage was assessed by real-time spectrophotometry. In 94% of the trials, three configurations – traditional Bain, modified Bain, and Mapleson E with unmodified mask – permitted isoflurane leakage approaching or exceeding 100 ppm at the face/port interface. In contrast, the Mapleson circuit with diaphragm-modified mask emitted significantly (P≤0.0003) less isoflurane (peak of 9.5±1.7 ppm [mean±standard error]). These data indicate that (1) WAG leakage from standard rodent non-rebreathing circuits is substantial, and that (2) a simple, rapid, and economical modification to a conventional rodent facemask can significantly reduce WAG exposure to workers performing many rodent anaesthesia procedures in one session.
- Subjects
ANESTHESIA; ISOFLURANE; METHYL ether; ANESTHETICS
- Publication
Laboratory Animals, 2006, Vol 40, Issue 2, p200
- ISSN
0023-6772
- Publication type
Article
- DOI
10.1258/002367706776318999