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Opioids for breathlessness: a narrative review
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    Opioids for breathlessness? A over estimation of the effectiveness.

    Dear Editor
    I write in response to an article printed in BMJ Supportive and Palliative Care; Opioids for breathlessness: a narrative review.1
    In this review Johnson and Currow strongly advocate for the use of sustained release morphine for breathlessness in the palliative care setting. The paper states:
    - “There is 1a evidence to support the use of opioids for breathlessness.”
    - “The best evidence is for 10-30mg daily de novo low dose oral sustained release morphine”
    - “This should be considered the current standard of care”
    The wording of this article, in particularly the seductive summary boxes, leads the reader to the conclusion that there is superior evidence to support using sustained release preparations of morphine as opposed to the more common approach of using immediate release ‘rescue’ preparations. However, this is not the case.
    The 1a evidence that the authors are referring to here is Dr Currow’s own paper: Regular sustained-release morphine for chronic breathlessness: a multicentre, double blind, randomised, placebo-controlled trial.2 What they neglect to mention when citing this paper is that it clearly found that there was no superiority to using sustained release morphine when compared to placebo.
    In this study, patients were randomised to sustained release morphine or placebo. Both groups were also permitted to take “as needed” immediate release morphine. The study found no sign...

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    Conflict of Interest:
    None declared.