Influence of cheek support on respiratory impedance measured by forced oscillation technique

Uchida, Akemi; Ito, Satoru; Suki, Bélâ; Matsubara, Hiroki; Hasegawa, Yoshinori

doi:10.1186/2193-1801-2-342

Cited by 21 publications

(16 citation statements)

References 31 publications

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“…Cheek support by an operator, not the subject himself/herself, was found to result in different impedance values (lower Rrs and smaller Xrs) in patients with respiratory diseases, but not in healthy controls (10). The subjects are instructed to breathe quietly at a functional residual capacity level (tidal breathing) for approximately 30 seconds.…”

Section: Measurementsmentioning

confidence: 99%

Clinical Application of the Forced Oscillation Technique

Shirai

Kurosawa

2016

Intern. Med.

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The forced oscillation technique (FOT) is a noninvasive method with which to measure respiratory system resistance and reactance during tidal breathing. Recently, its clinical application has spread worldwide with the expansion of commercially available broadband frequency FOT devices, including MostGraph and Impulse Oscillometry. An increasing number of reports have supported the usefulness of the FOT in the management of asthma and chronic obstructive pulmonary disease (COPD). However, the FOT is not a surrogate test for spirometry, but should be used complementarily. Furthermore, reference values are not necessarily available and the interpretation of some measured data is controversial. There is a need to update the international statement for not only technical aspects but also the clinical use of the FOT. In this review, we summarize the previously published studies and discuss how to use the FOT in a clinical setting.

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Section: Measurementsmentioning

confidence: 99%

Clinical Application of the Forced Oscillation Technique

Shirai

Kurosawa

2016

Intern. Med.

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“…It is therefore important to properly hold the cheeks during the test so that they do not vibrate. Inaccurate cheek holding results in a significant lowering of the resistance value in patients with obstructive and interstitial diseases, with only a small effect on the measured values in healthy people [47].…”

Section: Limitations Of the Fot Methodsmentioning

confidence: 93%

“…The poor cheek support is a common artefact during FOT measurement. Pressure oscillations are applied at the mouth and the impedance of extra-thoracic airway walls, including the cheek, tongue, mouthpiece and upper airway affect the results of measurements [14,47]. If the cheeks are not held properly, resistance values reduce significantly (Rrs is therefore underestimated) [47].…”

Section: Limitations Of the Fot Methodsmentioning

confidence: 99%

“…Pressure oscillations are applied at the mouth and the impedance of extra-thoracic airway walls, including the cheek, tongue, mouthpiece and upper airway affect the results of measurements [14,47]. If the cheeks are not held properly, resistance values reduce significantly (Rrs is therefore underestimated) [47]. The results of the measurements are affected by interference from the upper respiratory tract, especially at higher frequencies and when a respiratory obstruction is present.…”

Section: Limitations Of the Fot Methodsmentioning

confidence: 99%

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Application of the Forced Oscillation Technique in Diagnosing and Monitoring of Asthma in Preschool Children

Starczewska-Dymek¹,

Bożek

Dymek³

2019

Advances in Respiratory Medicine

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The measurement of lung function in preschool children for the diagnosis of asthma is not routinely used. The need to perform forced expiratory manoeuvres requires active cooperation and thus limits the application of spirometry in this age group. The forced oscillation technique (FOT) is a simple and noninvasive method of assessing the mechanical properties of the respiratory system during tidal breathing. It is used in young patients and requires minimal cooperation. It provides an objective assessment of the respiratory system in a group of patients in whom we have not yet had appropriate diagnostic tools. In recent years, due to the availability of new technical solutions, FOT has been increasingly used and has a chance to become a valuable tool in diagnosing and monitoring of treatment in preschool children. This article presents the possibility of the clinical application of FOT in diagnosing and monitoring of early childhood asthma.

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“…In order to validate the prototype FOT device, experimentally tested the device with 10 healthy adult volunteers, including 5 male and 5 female, respectively, with average height of 166 cm, average weight of 65kg and average age of 31.2y. The volunteer was tested at sit-up straight and resting state [10]. Figure 5 shows the waveforms of pressure and flow signals as measured by the pressure and flow sensors.…”

Section: The Experimental Testing Of the Fot Devicementioning

confidence: 99%

Development of a Small Portable Device for Measuring Respiratory System Resistance Based on Forced Oscillation Technique

Deng¹

2016

J. Advs. Biomed. Eng. Techno.

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Spirometry and forced oscillation technique (FOT) are two different methods that are currently used for lung function test. However, the former requires patient's effort to cooperate, thus is often unreliable for certain patients such as the young children and the latter is always related to bulky and expensive machines. In order to overcome the limitations of current device, we developed a portable prototype of FOT device for measuring respiratory resistance. The device consisted of a small advanced voice coil actuator to generate sinusoidal oscillatory airflow with amplitude of 2.5 cmH2O and frequency of 5 Hz, which was then superimposed onto the normal breathing airflow of the patient via a mouth piece. The pressure and flow signals of the respiratory airflow after absorption and refraction by the airways and the lung tissues were detected and acquired using NI USB-6211 data acquisition card and synchronous sampling pressure and flow sensors. After the upper computer received the digital signals that the capture card converted, the signals were processed and analyzed in real-time by the proprietary LabVIEW-based software. The analysis included digital signal filtering and impedance calculation in frequency domain, resulting in respiratory system resistance (Rrs) and reactance (Xrs). The results of present experiments on healthy volunteers demonstrated that the device could measure the respiratory system resistance with good reliability and accuracy. Importantly, due to both the hardware and software design the weight and volume of this device was reduced down to 3.5kg and 2500 cm 3 , respectively, proving the prototype to be worth of further developing into an inexpensive and portable tool for testing or monitoring lung function at rural community clinics or homes.

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Influence of cheek support on respiratory impedance measured by forced oscillation technique

Cited by 21 publications

References 31 publications

Clinical Application of the Forced Oscillation Technique

Clinical Application of the Forced Oscillation Technique

Application of the Forced Oscillation Technique in Diagnosing and Monitoring of Asthma in Preschool Children

Development of a Small Portable Device for Measuring Respiratory System Resistance Based on Forced Oscillation Technique

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