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Nitrous oxide can be made more effective and predictable using a closed breathing circuit
  1. F Weinberg1,
  2. J Drake2,
  3. D Vaughan2
  1. 1
    Central Middlesex Hospital, London, UK
  2. 2
    Northwick Park Hospital, Harrow, UK
  1. Dr F E Weinberg, Central Middlesex Hospital, London, UK; fayeweinberg{at}

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We read with interest the study by Babl et al1 published in the EMJ in November 2008.

Central to the protocol and management is the use of clinical assessment to determine adequacy and depth of analgesia/sedation. We agree with this wholeheartedly and support this method as it emphasises the importance of conscious sedation as an adjunct to therapy, rather than unconscious sedation to …

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  • Competing interests: None.