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Does body height reduction influence interpretation of lung function in COPD patients?

A Kjensli1, M Ryg, J A Falch

  • 1Glittreklinikken, Pb 104 Aaneby, N-1485 Hakadal, Norway. aina.kjensli@glittreklinikken.no

The European Respiratory Journal
|January 30, 2010
PubMed
Summary

Vertebral deformities in COPD patients cause height loss, potentially overestimating lung function. Using recalled tallest height or arm span height may improve accuracy for these patients.

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Geriatrics

Background:

  • Vertebral deformities are common in chronic obstructive pulmonary disease (COPD).
  • Height reduction due to deformities can impact pulmonary function test (PFT) interpretation.
  • Overestimation of lung function may occur if reduced height is used in PFT calculations.

Purpose of the Study:

  • To determine the frequency of lung function misinterpretation due to height reduction in COPD patients.
  • To investigate the correlation between vertebral deformities and height reduction.
  • To assess the impact of height reduction on PFT results in COPD.

Main Methods:

  • Cross-sectional study of 465 COPD patients and 462 controls.
  • Height reduction assessed by comparing measured height to recalled tallest height (RTH) and arm span height (ASH).
  • Vertebral deformities evaluated via radiographs; pulmonary function assessed using standard formulae.

Main Results:

  • Height reduction was prevalent in both groups and increased with vertebral deformity number/severity.
  • Significant lung function overestimation occurred in COPD patients with modest height reduction using current measured height.
  • Effects on lung function varied, with total lung capacity and residual volume most affected.

Conclusions:

  • Height reduction is common in COPD patients and linked to vertebral deformities.
  • Current measured height can lead to overestimation of lung function in COPD.
  • RTH or ASH may be better for PFT predictions in COPD patients with significant height loss; consider screening for osteoporosis.