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Age and height dependence of lung clearance index and functional residual capacity

Sooky Lum, Janet Stocks, Sanja Stanojevic, Angie Wade, Paul Robinson, Per Gustafsson, Meghan Brown, Paul Aurora, Padmaja Subbarao, Ah-fong Hoo, Samatha Sonnappa
European Respiratory Journal 2012; DOI: 10.1183/09031936.00005512
Sooky Lum
*Portex Respiratory Unit, UCL Institute of Child Health, London
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  • For correspondence: s.lum@ich.ucl.ac.uk
Janet Stocks
*Portex Respiratory Unit, UCL Institute of Child Health, London
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Sanja Stanojevic
*Portex Respiratory Unit, UCL Institute of Child Health, London
#Hospital for Sick Children, Toronto, Canada
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Angie Wade
¶Centre for Paediatric Epidemiology and Biostatistics, UCL Institute of Child Health, London
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Paul Robinson
*Portex Respiratory Unit, UCL Institute of Child Health, London
+Dept of Paediatric Respiratory Medicine, The Children's Hospital, Westmead, Sydney, Australia
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Per Gustafsson
§Dept of Paediatrics, Central Hospital, Skövde, Sweden
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Meghan Brown
#Hospital for Sick Children, Toronto, Canada
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Paul Aurora
*Portex Respiratory Unit, UCL Institute of Child Health, London
fDept of Paediatric Respiratory Medicine, Great Ormond Street Hospital for Children NHS Foundation Trust, London
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Padmaja Subbarao
#Hospital for Sick Children, Toronto, Canada
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Ah-fong Hoo
fDept of Paediatric Respiratory Medicine, Great Ormond Street Hospital for Children NHS Foundation Trust, London
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Samatha Sonnappa
*Portex Respiratory Unit, UCL Institute of Child Health, London
fDept of Paediatric Respiratory Medicine, Great Ormond Street Hospital for Children NHS Foundation Trust, London
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Abstract

The lung clearance index(LCI) is more sensitive than spirometry in detecting abnormal lung function in children with cystic fibrosis. LCI is thought to be independent of age, but recent evidence suggests that the upper limit of normal is higher in infants and preschool children than in older subjects. This study examines whether LCI remains independent of body size throughout childhood.

Multiple breath washout data from healthy children and adolescents were collated from three centres using the Mass Spectrometer system and inert gas SF6. Reference equations for LCI and functional residual capacity (FRC) were constructed using the LMS (Lambda, Mu, Sigma) method.

Data were available from 497 subjects (2weeks to 19 years old) tested on 659 occasions. LCI was dependent on body size, decreasing in a non-linear pattern as height increases. Changes were particularly marked in the first five years of life. Height, age and sex were all independent predictors of FRC. Minimal between-centre differences allowed unified reference equations to be developed.

LCI is not independent of body size. Although a constant upper normal limit would suffice for cross-sectional clinical assessments from six years of age, appropriate reference equations are essential for accurate interpretation of results during early childhood.

  • Children
  • functional residual capacity
  • lung clearance index
  • reference range
  • multiple breath washout technique
  • ERS
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European Respiratory Journal: 61 (1)
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Age and height dependence of lung clearance index and functional residual capacity
Sooky Lum, Janet Stocks, Sanja Stanojevic, Angie Wade, Paul Robinson, Per Gustafsson, Meghan Brown, Paul Aurora, Padmaja Subbarao, Ah-fong Hoo, Samatha Sonnappa
European Respiratory Journal Jan 2012, erj00055-2012; DOI: 10.1183/09031936.00005512

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Age and height dependence of lung clearance index and functional residual capacity
Sooky Lum, Janet Stocks, Sanja Stanojevic, Angie Wade, Paul Robinson, Per Gustafsson, Meghan Brown, Paul Aurora, Padmaja Subbarao, Ah-fong Hoo, Samatha Sonnappa
European Respiratory Journal Jan 2012, erj00055-2012; DOI: 10.1183/09031936.00005512
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