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Updated: Dec 27, 2025

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
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Restrictive spirometric pattern and true pulmonary restriction in a general population sample aged 50 - 64 years.

Kjell Torén1,2, Linus Schiöler3, Jonas Brisman4

  • 1Occupational and Environmental Medicine, School of Public Health and Community Medicine, Sahlgrenska Academy, University of Gothenburg, Box 414, S-405 30, Gothenburg, Sweden. Kjell.Toren@amm.gu.se.

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|February 29, 2020
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Summary

The proxy restrictive spirometric pattern (RSP) has low accuracy in identifying true pulmonary restriction in the general population. However, RSP is useful for ruling out pulmonary restriction.

Keywords:
RSPReference valuesRestrictive lung diseaseSCAPISTLCValidity

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Area of Science:

  • Pulmonary Medicine
  • Diagnostic Accuracy
  • Epidemiology

Background:

  • The diagnostic accuracy of the proxy restrictive spirometric pattern (RSP) for identifying true pulmonary restriction is often low.
  • Existing data primarily comes from referred patients, lacking general population insights.
  • This study investigates RSP's validity as a proxy for true pulmonary restriction in a general population cohort.

Purpose of the Study:

  • To validate the proxy restrictive spirometric pattern (RSP) against true pulmonary restriction in a general population.
  • To assess the diagnostic accuracy of RSP using spirometry and total lung capacity measurements.

Main Methods:

  • Utilized data from the Swedish CArdioPulmonary bioImage Study (SCAPIS Pilot) with 983 adults aged 50-64.
  • Defined true pulmonary restriction as TLC < LLN (Z score < -1.645) and RSP as FEV1/FVC ≥ LLN and FVC < LLN post-bronchodilation.
  • Calculated sensitivity, specificity, and likelihood ratios with 95% confidence intervals.

Main Results:

  • Prevalence of true pulmonary restriction was 5.4%, while RSP prevalence was 3.4%.
  • RSP demonstrated a sensitivity of 0.34 (0.20-0.46) and a specificity of 0.98 (0.97-0.99).
  • Positive likelihood ratio was 21.1 (11.3-39.4), and negative likelihood ratio was 0.67 (0.55-0.81).

Conclusions:

  • The proxy restrictive spirometric pattern (RSP) exhibits low accuracy in diagnosing true pulmonary restriction.
  • Findings support previous research indicating RSP's utility in excluding pulmonary restriction.
  • RSP may be a valuable tool for ruling out, but not confirming, pulmonary restriction in population studies.