LUNOKID: can numerical American Thoracic Society/European Respiratory Society quality criteria replace visual inspection of spirometry?
The gold standard for assessing quality of forced expiratory manoeuvres is visual inspection by an expert. American Thoracic Society/European Respiratory Society numerical quality criteria (NQC) include back-extrapolated volume (BEV), repeatability and forced expiratory time (FET). Equipment currently available provides feedback tempting the investigator to use NQC as pass-fail criterion. To investigate whether using NQC instead of visual acceptability is a valid option, we analysed data from a multicentre national reference study in Germany of children aged 4-18 years. Spirometry was performed under field conditions. Receiver operating characteristic analysis was used to assess performance of BEV, repeatability, FET and a combination thereof in relation to visual acceptability. We included data from 3133 healthy Caucasians in the analyses; 72% delivered at least two visually acceptable manoeuvres. Of these, 59% would have been rejected based on combined NQC, mainly because the FET criterion was not feasible. Specificity of the NQC was generally low (BEV 10%, repeatability 30% and FET 50%). Receiver operating characteristic analysis showed that a combination of the three measures could reach at best a sensitivity of 90% and specificity of 56%. We conclude that visual control is mandatory and NQC may help obtain the best possible results, but a fixed cut-off for FET should be abandoned.
Medical School, Hannover.
Christine
C
Müller-Brandes
Ursula
U
Krämer
Monika
M
Gappa
Gabriele
G
Seitner-Sorge
Anke
A
Hüls
Andrea
A
von Berg
Barbara
B
Hoffmann
Antje
A
Schuster
Sabina
S
Illi
Matthias
M
Wisbauer
Dietrich
D
Berdel
D000293:Adolescent; D000465:Algorithms; D002648:Child; D002675:Child, Preschool; D003936:Diagnosis, Computer-Assisted; D045853:Exhalation; D005260:Female; D005541:Forced Expiratory Volume; D005858:Germany; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D015588:Observer Variation; D015272:Pulmonary Medicine / Q000458:organization & administration* / Q000592:standards*; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software; D013147:Spirometry / Q000379:methods*; D011795:Surveys and Questionnaires; D014481:United States; D014797:Vital Capacity