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Feedback information from flow volume curves to the practice.

Tjard Schermer1, Joliet Hartman2, Chantal Lauwers1

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Viewing flow volume (F/V) curves during spirometry improved test quality for practice assistants. This modest improvement in spirometry test quality suggests F/V curve feedback is beneficial in general practice settings.

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Area of Science:

  • Pulmonary Function Testing
  • Spirometry Quality Improvement
  • General Practice Diagnostics

Background:

  • Spirometry is crucial for diagnosing respiratory conditions.
  • Test quality can be variable, especially when performed by non-specialists.
  • Flow volume (F/V) curves offer real-time feedback during spirometry.

Purpose of the Study:

  • To determine if real-time F/V curve visualization enhances spirometry quality.
  • To assess the impact of F/V curve feedback on key spirometry metrics.
  • To evaluate the utility of F/V curve feedback for practice assistants.

Main Methods:

  • Randomized controlled crossover study with 47 healthy subjects.
  • Practice assistants performed spirometry under 'unblinded' (F/V curves visible) and 'blinded' conditions.
  • Key outcomes included FEV1, FVC, PEF, and repeatability; technician preference was also recorded.

Main Results:

  • Higher Peak Expiratory Flow (PEF) values were observed in the unblinded condition (0.43 L/s).
  • No significant differences were found in FEV1, FVC, or repeatability.
  • One technician favored unblinded F/V curves in 62% of tests (p=0.012).

Conclusions:

  • Real-time F/V curve feedback offers a modest improvement in spirometry test quality.
  • This feedback mechanism is recommended for use by practice assistants in general practice.
  • Enhancing spirometry quality can lead to more reliable diagnostic information.