Letters Prognostic pessimism

Don’t group COPD and asthma

BMJ 2007; 335 doi: https://doi.org/10.1136/bmj.39423.433704.1F (Published 13 December 2007) Cite this as: BMJ 2007;335:1225
  1. Suveer Singh, consultant in intensive care and respiratory medicine1,
  2. Daffyd Lloyd, anaesthesia resident1,
  3. Tasneem Katawala, anaesthesia resident1,
  4. James Harris, anaesthesia resident1,
  5. Radha Sabharatnam, foundation year 11
  1. 1Intensive Care Unit, Magill Department of Anaesthesia, Intensive Care, and Pain Management, Chelsea and Westminster Hospital, London SW10 9HJ
  1. suveer.singh{at}imperial.ac.uk

    We have concerns about the CAOS study’s interpretation of prognostic estimates by grouping chronic obstructive pulmonary disease (COPD) and asthma together1: this may underestimate the true discrepancy suggested.

    Asthma and COPD are essentially different diseases, in terms of aetiology, clinical …

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