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Thirty-count breathlessness score: reliability, sensitivity, specificity and validity.

Marie Williams1, Marissa Sorich, Paul Cafarella

  • 1School of Health Sciences, University of South Australia, Adelaide, South Australia, Australia. marie.williams@unisa.edu.au

Respirology (Carlton, Vic.)
|September 19, 2007
PubMed
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The thirty-count breathlessness score (30CBS) is reliable for COPD patients but lacks sensitivity to distinguish them from healthy individuals. It correlates with physiological impairment but not directly with breathlessness perception.

Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Clinical Assessment

Background:

  • The fifteen-count breathlessness score (15CBS) has limitations due to a ceiling effect in quantifying breathlessness.
  • A need exists for a more sensitive tool to assess breathlessness in Chronic Obstructive Pulmonary Disease (COPD).

Purpose of the Study:

  • To evaluate the reliability, sensitivity, specificity, and validity of the thirty-count breathlessness score (30CBS) in adults with COPD.
  • To compare the discriminative ability of the 30CBS against the 15CBS.

Main Methods:

  • Observational correlation study design.
  • Videotaping of COPD subjects performing the 30CBS on two occasions.
  • Collection of data through quality of life questionnaires, self-report breathlessness measures, pulmonary function tests, and comparison with asymptomatic controls.

Related Experiment Videos

Main Results:

  • The 30CBS demonstrated good reliability (ICC >0.7) among assessors.
  • The 30CBS showed higher sensitivity (55.8%) than the 15CBS (33.2%), but still insufficient to differentiate COPD from controls.
  • Significant correlations were found between the 30CBS and measures of pulmonary impairment, age, height, and the Visual Analogue Scale for breathlessness.

Conclusions:

  • The 30CBS is reliable but lacks adequate sensitivity for diagnosing COPD.
  • The 30CBS may serve as an indicator of physiological impairment in COPD.
  • Further investigation is warranted for subjects needing over two breaths on the 30CBS.