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Case finding for chronic obstructive pulmonary disease: a model for optimising a targeted approach
  1. Rachel E Jordan1,
  2. Kin-bong Hubert Lam1,
  3. Kar Keung Cheng1,
  4. Martin R Miller2,
  5. Jennifer L Marsh1,
  6. Jon G Ayres3,
  7. David Fitzmaurice4,
  8. Peymané Adab1
  1. 1Unit of Public Health, Epidemiology & Biostatistics, University of Birmingham, UK
  2. 2Department of Medicine, University Hospital Birmingham NHS Trust, Birmingham, UK
  3. 3Institute of Occupational and Environmental Medicine, University of Birmingham, UK
  4. 4Primary Care Clinical Sciences, University of Birmingham, UK
  1. Correspondence to Dr Rachel Jordan, Unit of Public Health, Epidemiology & Biostatistics, Public Health Building, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; r.e.jordan{at}bham.ac.uk

Abstract

Objectives Case finding is proposed as an important component of the forthcoming English National Clinical Strategy for chronic obstructive pulmonary disease (COPD) because of accepted widespread underdiagnosis worldwide. However the best method of identification is not known. The extent of undiagnosed clinically significant COPD in England is described and the effectiveness of an active compared with an opportunistic approach to case finding is evaluated.

Methods A cross-sectional analysis was carried out using using Health Survey for England (HSE) 1995–1996 data supplemented with published literature. A model comparing an active approach (mailed questionnaires plus opportunistic identification) with an opportunistic-only approach of case finding among ever smokers aged 40–79 years was evaluated. There were 20 496 participants aged ≥30 years with valid lung function measurements. The main outcome measure was undiagnosed clinically significant COPD (any respiratory symptom with both forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) <0.7 and FEV1 <80% predicted).

Results 971 (4.7%) had clinically significant COPD, of whom 840 (86.5%) did not report a previous diagnosis. Undiagnosed cases were more likely to be female, and smoked less. 25.3% had severe disease (FEV1 <50% predicted), 38.5% Medical Research Council (MRC) grade 3 dyspnoea and 44.1% were current smokers. The active case-finding strategy can potentially identify 70% more new cases than opportunistic identification alone (3.8 vs 2.2 per 100 targeted). Treating these new cases could reduce hospitalisations by at least 3300 per year in England and deaths by 2885 over 3 years.

Conclusions There is important undiagnosed clinically significant COPD in the population, and the addition of a systematic case-finding approach may be more effective in identifying these cases. The cost-effectiveness of this approach needs to be tested empirically in a prospective study.

  • Case finding
  • COPD
  • Health Survey for England
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  • Web Only Data thx.2009.129395

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Footnotes

  • Competing interests None.

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

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