Forty years of reference values for respiratory system impedance in adults: 1977–2017

Kalchiem‐Dekel, Or; Hines, Stella E.

doi:10.1016/j.rmed.2018.01.015

Cited by 36 publications

(34 citation statements)

References 56 publications

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“…There are numerous published values in different populations, for both children and adults [123] ( supplementary table E1). As with all lung function tests, the appropriateness of any predicted equations for a particular oscillometric device should be determined for the population in which it is to be applied by each laboratory.…”

Section: Reference Valuesmentioning

confidence: 99%

Technical standards for respiratory oscillometry

King

Bates

Berger³

et al. 2019

Eur Respir J

387

496

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Oscillometry (also known as the forced oscillation technique) measures the mechanical properties of the respiratory system (upper and intrathoracic airways, lung tissue and chest wall) during quiet tidal breathing, by the application of an oscillating pressure signal (input or forcing signal), most commonly at the mouth. With increased clinical and research use, it is critical that all technical details of the hardware design, signal processing and analyses, and testing protocols are transparent and clearly reported to allow standardisation, comparison and replication of clinical and research studies. Because of this need, an update of the 2003 European Respiratory Society (ERS) technical standards document was produced by an ERS task force of experts who are active in clinical oscillometry research.The aim of the task force was to provide technical recommendations regarding oscillometry measurement including hardware, software, testing protocols and quality control.The main changes in this update, compared with the 2003 ERS task force document are 1) new quality control procedures which reflect use of “within-breath” analysis, and methods of handling artefacts; 2) recommendation to disclose signal processing, quality control, artefact handling and breathing protocols (e.g. number and duration of acquisitions) in reports and publications to allow comparability and replication between devices and laboratories; 3) a summary review of new data to support threshold values for bronchodilator and bronchial challenge tests; and 4) updated list of predicted impedance values in adults and children.

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Section: Reference Valuesmentioning

confidence: 99%

Technical standards for respiratory oscillometry

King

Bates

Berger³

et al. 2019

Eur Respir J

387

496

View full text Add to dashboard Cite

show abstract

“…38 In a recent study of reference data, 34 studies were reviewed, dating from 1977 to 2016. 39 During this time span, the oscillometry has developed from homebuilt devices to commercially engineered instruments. Alas, this review study spans a variety of different approaches.…”

Section: Reference Valuesmentioning

confidence: 99%

“…The role of age was not found to be clear and, in general, elderly subjects were underrepresented in most studies. 39 Because of the large variability in study approach and design, oscillometry technique, inclusion-exclusion criteria, the historical use of small cohorts, and differences between devices there is a need for large population-based studies that are based on standardized methodology.…”

Section: Reference Valuesmentioning

confidence: 99%

Applications of oscillometry in clinical research and practice

Lundblad

Siddiqui

Bossé

et al. 2019

Canadian Journal of Respiratory, Critical Care, and Sleep Medic

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Oscillometry is gaining in clinical use and while there is an increased interest in the technique, there is paucity in the understanding of its possibilities and limitations. Oscillometry has seen extensive use in research over several decades, but only recently is the technique being adopted in clinical practice; hence, there is a need to educate the novel users. The goal of the mini symposium arranged in San Diego in 2018 was to discuss the principles of oscillometry, showcase some of the recent ongoing research using this technique and to demonstrate how oscillometry may be used in clinical practice. It was concluded that oscillometry has several advantages over spirometry, most notably, with novel data being shown, its sensitivity allowing early detection of small airways disease not possible with spirometry and it can be used in subjects who have difficulties performing forced maneuvers such as preschool children, the elderly and subjects with handicaps. The site of respiratory pathology can be reflected by the various parameters generated by oscillometry and thus help with both disease diagnosis and localization. While the interpretation of oscillometry parameters and translating them into meaningful pathological correlates is still evolving, it is likely that oscillometry will soon be at the forefront of both pulmonary clinical practice and research. R ESUM EL'oscillom etrie est de plus en plus utilis ee en contexte clinique, mais malgr e l'int erêt accru pour cette technique, la compr ehension de ses possibilit es et de ses limites est encore insuffisante. Pendant plusieurs d ecennies, l'oscillom etrie a largement et e utilis ee dans la recherche, mais l'adoption de cette technique dans la pratique clinique est encore r ecente, de sorte qu'il est n ecessaire de former les nouveaux utilisateurs. Le but de ce mini symposium qui s'est tenu a San Diego en 2018 etait de discuter des principes de l'oscillom etrie, de pr esenter les plus r ecentes etudes utilisant cette technique et de d emontrer comment elle peutêtre utilis ee dans la pratique clinique. Il a et e d etermin e que l'oscillom etrie pr esentait plusieurs avantages par rapport a la spirom etrie notamment, comme le d emontrent de nouvelles donn ees, sa sensibilit e qui permet la d etection pr ecoce de la maladie des petites voies a eriennes, ce que la spirom etrie ne peut pas faire, ainsi que le fait qu'elle puisseêtre utilis ee aupr es de sujets qui eprouvent de la difficult e a effectuer des manoeuvres forc ees comme les enfants d'âge pr escolaire, les personnesâg ees et les personnes atteintes d'un handicap. L'emplacement de la pathologie respiratoire peut se refl eter dans les divers param etres produits par la spirom etrie, ce qui peut contribuer a diagnostiquer la maladie et a la localiser. Bien que l'interpr etation des param etres de l'oscillom etrie et leur traduction dans des corr elats pathologiques significatifs continue d' evoluer, l'oscillom etrie sera vraisemblablement a l'avant-plan de la pratique clinique et de la recherche pulmonair...

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“…Since the devices differ in several aspects, such as measurement duration, frequency content, waveform and intensity of oscillations, and signal processing techniques, concerns have been raised about their compatibility in the measurement of respiratory impedance (Z rs ). This is particularly important, as numerous databases are being established for various populations with different age groups and ethnicity [7], and the derived reference values would be impractical if they remain device specific. While rigorous criteria and testing procedures have been established for spirometry [8][9][10], this stage has not been reached in oscillometry.…”

Section: Introductionmentioning

confidence: 99%

Comparison of oscillometry devices using active mechanical test loads

et al. 2019

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Noninvasiveness, low cooperation demand and the potential for detailed physiological characterisation have promoted the use of oscillometry in the assessment of lung function. However, concerns have been raised about the comparability of measurement outcomes delivered by the different oscillometry devices. The present study compares the performances of oscillometers in the measurement of mechanical test loads with and without simulated breathing.Six devices (five were commercially available and one was custom made) were tested with mechanical test loads combining resistors (R), gas compliances (C) and a tube inertance (L), to mimic respiratory resistance (R rs ) and reactance (X rs ) spectra encountered in clinical practice. A ventilator was used to simulate breathing at tidal volumes of 300 and 700 mL at frequencies of 30 and 15 min −1 , respectively. Measurements were evaluated in terms of R, C, L, resonance frequency ( f res ), reactance area (A X ) and resistance change between 5 and 20 or 19 Hz (R 5-20(19) ).Increasing test loads caused progressive deviations in R rs and X rs from calculated values at various degrees in the different oscillometers. While mean values of R rs were recovered acceptably, some devices exhibited serious distortions in the frequency dependences of R rs and X rs , leading to large errors in C, L, f res , A X and R 5-20(19) . The results were largely independent of the simulated breathing.Simplistic calibration procedures and mouthpiece corrections, in addition to unknown instrumental and signal processing factors, may be responsible for the large differences in oscillometry measures. Rigorous testing and ongoing harmonisation efforts are necessary to better exploit the diagnostic and scientific potential of oscillometry. @ERSpublicationsThe clinical utility of oscillometry is limited by the lack of standardisation of devices. This study tested six oscillometers, and reveals very different performances at higher mechanical impedances observed in children and adults with lung disease. http://bit.ly/317sfjHCite this article as: Dandurand RJ, Lavoie J-P, Lands LC, et al. Comparison of oscillometry devices using active mechanical test loads.

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Forty years of reference values for respiratory system impedance in adults: 1977–2017

Cited by 36 publications

References 56 publications

Technical standards for respiratory oscillometry

Technical standards for respiratory oscillometry

Applications of oscillometry in clinical research and practice

Comparison of oscillometry devices using active mechanical test loads

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