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Long-term performance of a hand held spirometer

A Dirksen1, F Madsen, O F Pedersen

  • 1Department of Pulmonary Medicine, Bispebjerg Hospital, Copenhagen, Denmark.

Thorax
|October 1, 1996
PubMed
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Small, handheld spirometers are suitable for long-term patient use in serial spirometric testing. These devices demonstrated excellent long-term reproducibility and acceptable durability over two years in emphysematous patients.

Area of Science:

  • Pulmonary Function Testing
  • Medical Device Performance
  • Respiratory Medicine

Background:

  • Assessing the long-term performance of small, handheld spirometers for self-administered serial testing.
  • Evaluating device suitability for continuous patient monitoring in chronic respiratory conditions.

Purpose of the Study:

  • To determine the long-term reliability and accuracy of pocket turbine spirometers.
  • To assess the durability and reproducibility of spirometers used by patients with alpha-1-antitrypsin deficiency.

Main Methods:

  • Clinical trial involving 30 MicroMedical DiaryCard turbine spirometers used by 22 emphysematous patients.
  • Spirometers recorded forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and peak expiratory flow (PEF).
  • Regular calibration checks using syringes and a decompression calibrator were performed over two years.

Related Experiment Videos

Main Results:

  • Mean recordings per spirometer: 693 over two years; mean calibration checks: 33.
  • Calibration signal variation: 1-2% (syringes), 0.5-1% (calibrator).
  • One spirometer turbine bearing failed; no significant drift observed in other devices, though calibrating devices had stability issues.

Conclusions:

  • Small handheld turbine spirometers are appropriate for long-term, patient-administered serial spirometric testing.
  • The devices offer acceptable two-year durability and excellent long-term reproducibility.
  • Further investigation into calibrating device stability may be warranted.