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Impulse oscillometry ( IOS ) employs high frequency sinusoidal or impulse pressure and flow waveforms to interrogate the mechanical properties of the respiratory system. It has special applications to preschool and younger children who may have difficulty performing the repetitive forced expiratory maneuvers required for spirometry.    Case presentation  We present a case illustrating improvements of respiratory system mechanics measured by  IOS  in a 6‐year‐old child with cystic fibrosis ( CF ) who demonstrated clinical and radiological improvement after a course of therapy with hospitalization and intravenous antibiotics, and initiation of a cystic fibrosis transmembrane regulator ( CFTR ) protein corrector/potentiator agent. We also report a new finding: observed lower than expected reactance at low compared to high frequencies (“reactance inversion”).    Conclusion  Reactance inversion may reflect parallel pathway inhomogeneities in resistance and elastance or intrabreath airway inertance changes in young children with  CF . Further study is needed in children with airway obstruction due to asthma, cystic fibrosis, and chronic lung disease of infancy to demonstrate the prevalence of this finding and whether it is specific to a measurement device.

“Reactance inversion” at low frequencies in a child undergoing treatment of a cystic fibrosis exacerbation