Ultrasonic Anemometer for the Measurement of Respiratory Flow in the Forced Oscillation Technique

We investigated the impedance of excised preparations of the human larynx before and after resection of the vocal cords and of the trachea whether or not in connection with the main bronchi for steady (75–700 ml.s-1) and oscillatory flows (4–64 Hz). To simulate the influence of respiratory flow on oscillatory resistance (Rosc), oscillatory and steady flow were superimposed. This resulted in a marked increase of Rosc, dependent on the value of steady flow, a change of the frequency dependence of Rosc, and a decrease of the reactance. The latter effects were particularly pronounced in the preparations of the larynx, especially with a narrow glottis opening. The influence of steady flow on oscillatory resistances is probably the expression of interactions of steady and oscillatory flow regimes in the larynx. Similar but less pronounced interactions are also met in the trachea. These effects lead to a systematic overestimation of upper airway resistance when measured during spontaneous breathing by means of a forced oscillation technique.

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A modified measurement of respiratory resistance by forced oscillation during normal breathing

Journal of Applied Physiology ◽

10.1152/jappl.1975.39.2.305 ◽

1975 ◽

Vol 39 (2) ◽

pp. 305-311 ◽

Cited By ~ 16

Author(s):

D. C. Stanescu ◽

R. Fesler ◽

C. Veriter ◽

A. Fans ◽

L. Brasseur

Keyword(s):

Flow Rate ◽

Respiratory System ◽

Obstructive Lung Disease ◽

Forced Oscillation ◽

Forced Oscillation Technique ◽

Good Reproducibility ◽

Respiratory Resistance ◽

Normal Breathing ◽

Respiratory Flow ◽

Mouth Pressure

We have modified the measurements of the resistance of the respiratory system, Rrs, by the forced oscillation technique and we have developed equipment to automatically compute Rrs. Flow rate and mouth pressure are treated by selective averaging filters that remove the interference of the subject's respiratory flow on the imposed oscillations. The filtered mean Rrs represents a weighted ensemble average computer over both inspiration and expiration. This method avoids aberrant Rrs values, decreases the variability, and yields an unbiased mean Rrs. Rrs may be measured during slow or rapid spontaneous breathing, in normals and in obstructive patients, over a range of 3–9 Hz. A good reproducibility of Rrs at several days' interval was demonstrated. Frequency dependence of Rrs was found in patients with obstructive lung disease but not in healthy nonsmokers.

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Correlation between the changes respiratory resistance and reactance assessments, measured by forced oscillation technique (MostGraph), and respiratory-function assessments in childhood asthma

Nihon Shoni Arerugi Gakkaishi The Japanese Journal of Pediatric Allergy and Clinical Immunology ◽

10.3388/jspaci.28.111 ◽

2014 ◽

Vol 28 (1) ◽

pp. 111-118

Author(s):

Atsushi Isozaki ◽

Shingo Kobari ◽

Aki Tanaka ◽

Eriko Ando ◽

Yoichi Nakamura

Keyword(s):

Childhood Asthma ◽

Respiratory Function ◽

Forced Oscillation ◽

Forced Oscillation Technique ◽

Respiratory Resistance

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Evaluation of airway responsiveness using colored three-dimensional analyses of a new forced oscillation technique in controlled asthmatic and nonasthmatic children

Respiratory Investigation ◽

10.1016/j.resinv.2013.07.003 ◽

2014 ◽

Vol 52 (1) ◽

pp. 57-64 ◽

Cited By ~ 9

Author(s):

Katsumi Murakami ◽

Chizu Habukawa ◽

Hajime Kurosawa ◽

Tsukasa Takemura

Keyword(s):

Forced Oscillation ◽

Three Dimensional ◽

Airway Responsiveness ◽

Forced Oscillation Technique

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Perioperative evaluation of respiratory impedance using the forced oscillation technique: a prospective observational study

BMC Anesthesiology ◽

10.1186/s12871-016-0197-y ◽

2015 ◽

Vol 16 (1) ◽

Cited By ~ 5

Author(s):

Shoko Nakano ◽

Junko Nakahira ◽

Toshiyuki Sawai ◽

Yosuke Kuzukawa ◽

Junichi Ishio ◽

...

Keyword(s):

Observational Study ◽

Prospective Observational Study ◽

Forced Oscillation ◽

Forced Oscillation Technique ◽

Respiratory Impedance

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Forced oscillation technique in veterans with preserved spirometry and chronic respiratory symptoms

Respiratory Physiology & Neurobiology ◽

10.1016/j.resp.2018.11.012 ◽

2019 ◽

Vol 260 ◽

pp. 8-16 ◽

Cited By ~ 2

Author(s):

Ryan P. Butzko ◽

Anays M. Sotolongo ◽

Drew A. Helmer ◽

Jacquelyn C. Klein-Adams ◽

Omowunmi Y. Osinubi ◽

...

Keyword(s):

Respiratory Symptoms ◽

Forced Oscillation ◽

Forced Oscillation Technique

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Forced Oscillation Technique for Monitoring the Respiratory Status of Children with Cystic Fibrosis: A Systematic Review

Children ◽

10.3390/children8100857 ◽

2021 ◽

Vol 8 (10) ◽

pp. 857

Author(s):

Ioanna Loukou ◽

Maria Moustaki ◽

Agni Deligianni ◽

Olympia Sardeli ◽

Konstantinos Douros

Keyword(s):

Cystic Fibrosis ◽

Lung Function ◽

Children And Adolescents ◽

Forced Oscillation ◽

Clinical Symptoms ◽

Current Evidence ◽

Forced Oscillation Technique ◽

Gold Standard Method ◽

Respiratory Status ◽

Alternative Modality

Spirometry is considered the gold standard method for monitoring lung function of patients with cystic fibrosis (CF) but it requires patients’ cooperation and therefore it is not useful for the majority of preschool-aged children. Oscillometry is an alternative modality for lung function monitoring that requires minimal cooperation and can be applied in children as young as 3 years of age. Furthermore, it generates lesser aerosol compared to spirometry, an issue that is of considerable importance in the COVID-19 era. The aim of this review was to present the existing clinical data regarding the application of oscillometry in children and adolescents with CF. The method seems to have acceptable feasibility and repeatability. However, there is conflicting data regarding the correlation of oscillometry values with the clinical symptoms of CF patients either in clinically stable or in exacerbation periods. Furthermore, it is not clear to what extent oscillometry measurements correlate with the spirometry indices. Based on current evidence, spirometry cannot be substituted by oscillometry in the monitoring of the respiratory status of children and adolescents with CF.

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