Glottal Aperture and Buccal Airflow Leaks Critically Affect Forced Oscillometry Measurements

Chest
Andres BikovPaolo Paredi

Abstract

The forced oscillation technique (FOT) measures respiratory resistance and reactance; however, the upper airways may affect the results. We quantified the impact of glottal aperture and buccal air leaks. In the glottal aperture study (1) 10 healthy subjects (aged 34 ± 2 years) performed a total lung capacity maneuver followed by 10-s breath-hold with and without total glottal closure and (2) the effects of humming (incomplete glottal narrowing) on FOT measurements were studied in six healthy subjects. Glottal narrowing was confirmed by direct rhinolaryngoscopy. In the air leak study, holes of increasing diameter (3.5, 6.0, and 8.5 mm) were made to the breathing filters. Eleven healthy subjects (aged 33 ± 2 years) and five patients with COPD (aged 69 ± 3 years) performed baseline FOT measurements with the three modified filters. Narrow glottal apertures and humming generated whole-breath resistance at 5 Hz (R5) peaks, increased R5 (1.49 ± 0.37 kPa/L/s vs 0.34 ± 0.01 kPa/L/s, P < .001), and decreased whole-breath reactance at 5 Hz (X5) values (-2.10 ± 0.51 kPa/L/s vs -0.09 ± 0.01 kPa/L/s, P < .001). The frequency dependency of resistance was increased. Holes in the breathing filters produced indentations on the breathing trace. E...Continue Reading

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Citations

Jun 11, 2016·The Journal of Asthma : Official Journal of the Association for the Care of Asthma·Emil Schwarz WalstedVibeke Backer
Nov 1, 2016·American Journal of Respiratory and Critical Care Medicine·James H HullStephen J Fowler
Oct 13, 2016·ERJ Open Research·Kenneth I BergerJoan Reibman
Dec 26, 2018·Respiratory Physiology & Neurobiology·Yoshitaka IsobeYoshinori Hasegawa

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