Don’t group COPD and asthma

doi:10.1136/bmj.39423.433704.1F

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Suveer Singh, consultant in intensive care and respiratory medicine1,
Daffyd Lloyd, anaesthesia resident1,
Tasneem Katawala, anaesthesia resident1,
James Harris, anaesthesia resident1,
Radha Sabharatnam, foundation year 11

¹Intensive Care Unit, Magill Department of Anaesthesia, Intensive Care, and Pain Management, Chelsea and Westminster Hospital, London SW10 9HJ

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 …