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The forced oscillation technique in children with respiratory disease
Author(s) -
Solymar L.,
Aronsson PH.,
Sixt R.
Publication year - 1985
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.1950010507
Subject(s) - medicine , reactance , bronchoconstriction , forced oscillation , respiratory system , vital capacity , cardiology , airway resistance , asthma , electrical impedance , lung , lung function , physics , quantum mechanics , voltage , diffusing capacity , electrical engineering , engineering
The single‐frequency forced oscillation technique was used to estimate the total respiratory impedance, resistance, and reactance at 2, 4, and 12 Hz of children who had cricoid stenosis (CS; n = 11), provoked bronchoconstriction (PB; n = 6), or cystic fibrosis (CF; n = 13). The selection criteria for patients who had CS and CF were abnormal forced expiratory volume in 1 sec (FEV!) and/or maximal expiratory flow at 50% vital capacity (V max 50%). Sixteen of the 17 patients who had CS or PB were found to have resistance (R rs ) values outside the normal range at 4 Hz; at 2 Hz, 14 were found to have abnormal values and, at 12 Hz, only 9. The reactance in the CS and PB groups was somewhat less discriminative than R rs at all frequencies. Of the 13 patients who had CF, only 4 had abnormal R rs values; in this clinical condition, the reactance at 2 Hz was the most discriminative variable, being abnormal in 6 of the 13 patients. Irrespective of the clinical group, the R rs was, in absolute terms, highest at 2 Hz, and it decreased with increasing frequency. This pattern of negative frequency dependence was, however, not obviously specific for any of the tested clinical conditions and offered no information in addition to a single low‐frequency determination.