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To define reference ranges for the 3% and 4% mean desaturation nadir in healthy children under 12 years: observational study using oximetry motion-resistant technology
  1. Supriya Suresh Shinde,
  2. Jonathan Wen Yi Ong,
  3. Hazel J Evans
  1. Paediatric Respiratory Medicine, University Hospital Southampton NHS Foundation Trust, Southampton, UK
  1. Correspondence to Dr Hazel J Evans, Respiratory Medicine, Southampton Children's Hospital, Southampton SO16 6YD, UK; hazel.evans{at}

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In 2020 we published data defining reference ranges for pulse oximetry parameters generated from oximeters which use short averaging times and contain motion rejecting algorithms in healthy children under 12 years of age.1 This paper reported the minimum saturation (SAT min), which is the lowest oxygen saturation recorded, a value that is commonly reported in the paediatric literature.1 2 This is limited by the fact that it takes into account the single most severe dip, without reflecting the pattern of desaturations occurring throughout the period of sleep. It is increasingly recognised that the SATmin may not provide a representative reflection of the impact of sleep disordered breathing (SDB) on oxygen saturations.

Recently there has been interest in reporting the mean desaturation nadir (MDN).3 This is an average of the minimum saturation resulting from desaturations from baseline and may be a more useful parameter to assess the hypoxic burden of SDB. …

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  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.