Short-term variations in oscillatory and spirometric lung function indices among school children
| Autor: | KL Timonen, R O Salonen, Randell Jt, Juha Pekkanen |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Spirometry medicine.medical_specialty Vital capacity Time Factors Vital Capacity Maximal Midexpiratory Flow Rate FEV1/FVC ratio Forced Oscillation Technique Forced Expiratory Volume Oscillometry Internal medicine medicine Humans Lung volumes Child Lung Maximal Expiratory Flow Rate Maximal Expiratory Flow-Volume Curves Respiratory Sounds Asthma medicine.diagnostic_test business.industry Airway Resistance Respiratory disease Reproducibility of Results Repeatability medicine.disease Respiratory Function Tests Cough Chronic Disease Exercise Test Cardiology Physical therapy Female Pulmonary Ventilation business Follow-Up Studies |
| Zdroj: | European Respiratory Journal. 10:82-87 |
| ISSN: | 1399-3003 0903-1936 |
| DOI: | 10.1183/09031936.97.10010082 |
| Popis: | The aim of this study was to compare immediate, daily and weekly variation in respiratory resistance measured by means of the forced oscillation technique (Rrs,FOT) to spirometric indices in 7-12 year old children with chronic respiratory symptoms. The lung function measurements were performed in 19 children on 4 days, i.e. two consecutive days during two consecutive weeks. On each day, the measurements were carried out at the same time of day and always repeated three times. In addition, Rrs,FOT and spirometric lung function indices were compared with an exercise challenge test in 12 children. Intrasubject coefficients of variation (CoVs) for Rrs,FOT were larger than those for spirometric indices. Only in the immediately repeated measurements was the CoV of maximal expiratory flow at 25% vital capacity larger than that of Rrs,FOT (16.6 vs 14.9%). At all time intervals, the smallest CoVs were observed in forced vital capacity (FVC) or in the ratio of forced expiratory volume in one second to FVC (2.0-2.6%). When excluding Rrs,FOT values which were not within 2 SD (0.11 kPa.L-1.s) of the differences between the immediately repeated measurements, the CoV of the immediately repeated measurements of Rrs,FOT was reduced to 9.1%, being smaller than that of maximal mid-expiratory flow (10.1%). However, even then the day-to-day variation in Rrs,FOT was clearly larger (16.0%) than those of the airflow indices at specified lung volumes (7.2-8.3%). This was also true for the weekly variation. In the exercise challenge test, there were larger changes in Rrs,FOT values than in the spirometric indices, but Rrs,FOT was the most sensitive index to detect changes in the respiratory system. In conclusion, the variation in Rrs,FOT values was larger than that of most spirometric indices. When a reliability index was applied, the immediate variation in Rrs,FOT values was comparable to those of the airflow indices at specified lung volumes. Rrs,FOT was also the most sensitive index in the exercise challenge test, and therefore it seems to be suitable for detection of short-term functional changes in the respiratory system. However, the relatively low repeatability of Rrs,FOT over days and weeks may limit its applicability to longer-term follow-ups. |
| Databáze: | OpenAIRE |
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