Comparison of mainstream (Capnostat 5) and a low-flow sidestream capnometer (Capnostream) in mechanically-ventilated rabbits anesthetized with a Bain coaxial breathing system.

      Introduction: Measurement of end-tidal carbon dioxide (PE'CO2) provides continuous non-invasive estimation of arterial carbon dioxide partial pressure (PaCO2). Agreement can be affected by the high respiratory rates and shallow tidal volumes of rabbits, especially when anesthetizing with a non-rebreathing system and high fresh gas flows. Capnometer function may be improved by increasing tidal volume and decreasing respiratory rate with mechanical lung ventilation.
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