Articles: closed-circuit-anesthesia.
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Clinical Trial
Sevoflurane anaesthesia with an Oxford Miniature Vaporizer in vaporizer inside circle mode.
Anaesthesia was induced and maintained successfully with sevoflurane using an Oxford Miniature Vaporizer (OMV) in vaporizer inside circle (VIC) mode. With continuous monitoring using the Drager Narkomed 4 machine agent analyser, the expired sevoflurane concentration was monitored and controlled easily. During induction, there was no cardiovascular depression, apnoea or coughing, but involuntary movements and breath-holding were common.
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Ann Fr Anesth Reanim · Feb 1999
Editorial Comment[Pro or con accessory anesthesia breathing systems].
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Accessory or ancillary anaesthesia breathing systems can be defined as all those connected to the fresh gas outlet of the anaesthetic apparatus and used instead of the circle system associated with the ventilator, which is the main circuit. They include: the Mapleson systems, the systems with a nonrebreathing valve and the disposable systems with a carbon dioxide absorber. They can be a cause of major accidents when not checked before and monitored during use. This technical note describes techniques of preanaesthetic checking and monitoring during anaesthesia.
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The long predominance of the semi-open anaesthetic system in paediatric anaesthesia has been ended by the introduction of circle systems by Altemeyer. Narcoses in newborn infants, however, are usually performed with a circle system and a fresh gas flow (FGF) that greatly exceeds the ventilation volume per minute required. This prevents a desirable degree of gas climatisation. ⋯ When FGF was reduced there was a significant increase of temperature parameters after 25 min (gas) and 35 min (body). Body temperature came back to normal values or stayed normal. Artificial ventilation of neonates in anaesthesia lasting more than 50 minutes should routinely be performed with minimal FGF in order to ensure normothermia.
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Acta Anaesthesiol Belg · Jan 1999
Influence of methane on infrared gas analysis of volatile anesthetics.
Contemporary multigas analyzers determine anesthetic gas concentrations using (near) infrared analysis at either 3.3 or 8-9 microns. Methane also absorbs infrared light at 3.3 microns, but not at 8-9 microns. Consequently, erroneous anesthetic agent readings may result when methane is present in the circuit (e.g. during closed circuit anesthesia), potentially compromising patient safety. ⋯ At 3.3 microns wavelength the influence on the measurement of halothane was important, whereas the influence on that of enflurane and isoflurane was less pronounced. For desflurane and sevoflurane measurements, the influence of methane at 3.3 microns wavelength proved to be minimal. At higher wavelengths (8-9 microns) no influence of methane could be demonstrated.