J Allergy Clin Immunol Pract
July 2024
Background: The Phase III slope from a single breath nitrogen washout test provides information about ventilation heterogeneity (VH) in the lungs.
Purpose: To determine if the Phase III slope from the exhaled tracer gas concentration during a standard, single breath DCO test using rapid gas analysis provides similar information about VH.
Basic Procedures: Retrospective analysis of clinical pulmonary function laboratory data including spirometry, lung volumes, and DCO.
Background: Within-breath analysis of oscillometry parameters is a growing research area since it increases sensitivity and specificity to respiratory pathologies and conditions. However, reference equations for these parameters in White adults are lacking and devices using multiple sinusoids or pseudorandom forcing stimuli have been underrepresented in previous studies deriving reference equations. The current study aimed to establish reference ranges for oscillometry parameters, including also the within-breath ones in White adults using multi-sinusoidal oscillations.
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