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Correspondence
Defining obesity hypoventilation syndrome
  1. Aiman Tulaimat,
  2. Stephen Littleton
  1. Department of Pulmonary, Critical Care, and Sleep Medicine, John H Stroger Hospital of Cook County, Chicago, Illinois, USA
  1. Correspondence to Dr Aiman Tulaimat, Department of Pulmonary, Critical Care, and Sleep Medicine, John H Stroger Hospital of Cook County, 1900 West Polk Street, room 1404, Chicago, IL 60612, USA; atulaimat{at}cookcountyhhs.org

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The definition of obesity hypoventilation syndrome (OHS) proposed by Hart et al 1 raises two questions that we have tried to answer briefly in this letter.

First, previous definitions of OHS included obstructive sleep apnoea (OSA); Hart et al have excluded it. Why? OSA is present in most patients with OHS and is partly responsible for the hypercapnia.2 We believe that it is …

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