Abstract
We tested the accuracy of a new system for deriving standard spirometric indices, maximal expiratory flow rates, and slope ratios from volume-time tracings. A computer-based technique employing a hand-operated cursor was used to put discrete values of volume and time into a memory array. Spirometric values obtained on 102 subjects using the computer system were compared with the corresponding 'hand-read' values. The differences between the 2 measuring techniques were not significant for the FVC, the FEV75, and the FEF25-75; however, the average FEV1 different by 6.7 ml (SD, 20.3 ml), which was significant. In addition, 10 subjects performed FVC maneuvers through a spirometer and flowmeter connected in series. Flows and slope ratios obtained from the volume-time tracings were compared with those obtained directly from the flowmeter. There was a high degree of correlation between the 2 types of flow measurements (r = 0.989), whereas slope ratios were less well correlated (r = 0.589). Configurational detail such as the presence of 'bumps' on slope ratio versus volume plots were recovered with the computer technique. Using this new system, it is possible for 1 operator to process 10 to 12 sets of spirometry tracings per hour.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 108-112 |
| Number of pages | 5 |
| Journal | American Review of Respiratory Disease |
| Volume | 136 |
| Issue number | 1 |
| State | Published - 1987 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine
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Accuracy of spirometric and flow-volume indices obtained by digitizing volume-time tracings. / O'Donnell, C. R.; Sneddon, S. L.; Schenker, Marc B; Garshick, E.; Speizer, F. E.; Mead, J.
In: American Review of Respiratory Disease, Vol. 136, No. 1, 1987, p. 108-112.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Accuracy of spirometric and flow-volume indices obtained by digitizing volume-time tracings
AU - O'Donnell, C. R.
AU - Sneddon, S. L.
AU - Schenker, Marc B
AU - Garshick, E.
AU - Speizer, F. E.
AU - Mead, J.
PY - 1987
Y1 - 1987
N2 - We tested the accuracy of a new system for deriving standard spirometric indices, maximal expiratory flow rates, and slope ratios from volume-time tracings. A computer-based technique employing a hand-operated cursor was used to put discrete values of volume and time into a memory array. Spirometric values obtained on 102 subjects using the computer system were compared with the corresponding 'hand-read' values. The differences between the 2 measuring techniques were not significant for the FVC, the FEV75, and the FEF25-75; however, the average FEV1 different by 6.7 ml (SD, 20.3 ml), which was significant. In addition, 10 subjects performed FVC maneuvers through a spirometer and flowmeter connected in series. Flows and slope ratios obtained from the volume-time tracings were compared with those obtained directly from the flowmeter. There was a high degree of correlation between the 2 types of flow measurements (r = 0.989), whereas slope ratios were less well correlated (r = 0.589). Configurational detail such as the presence of 'bumps' on slope ratio versus volume plots were recovered with the computer technique. Using this new system, it is possible for 1 operator to process 10 to 12 sets of spirometry tracings per hour.
AB - We tested the accuracy of a new system for deriving standard spirometric indices, maximal expiratory flow rates, and slope ratios from volume-time tracings. A computer-based technique employing a hand-operated cursor was used to put discrete values of volume and time into a memory array. Spirometric values obtained on 102 subjects using the computer system were compared with the corresponding 'hand-read' values. The differences between the 2 measuring techniques were not significant for the FVC, the FEV75, and the FEF25-75; however, the average FEV1 different by 6.7 ml (SD, 20.3 ml), which was significant. In addition, 10 subjects performed FVC maneuvers through a spirometer and flowmeter connected in series. Flows and slope ratios obtained from the volume-time tracings were compared with those obtained directly from the flowmeter. There was a high degree of correlation between the 2 types of flow measurements (r = 0.989), whereas slope ratios were less well correlated (r = 0.589). Configurational detail such as the presence of 'bumps' on slope ratio versus volume plots were recovered with the computer technique. Using this new system, it is possible for 1 operator to process 10 to 12 sets of spirometry tracings per hour.
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UR - http://www.scopus.com/inward/citedby.url?scp=0023551306&partnerID=8YFLogxK
M3 - Article
C2 - 3605826
AN - SCOPUS:0023551306
VL - 136
SP - 108
EP - 112
JO - American Journal of Respiratory and Critical Care Medicine
JF - American Journal of Respiratory and Critical Care Medicine
SN - 1073-449X
IS - 1
ER -