Peak cough flow measurement with a pneumotacograph and a portable peak flow meter in patients with neuromuscular diseases

Rodrigues, Pedro; Brito, Pedro Ulisses; Fernandes, Luís Alberto D’Ávila; Rodrigues, Cidália; Reis, Alessandro; Moita, Joaquim

doi:10.1016/j.rppnen.2016.08.003

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…In previous studies, a pneumotachograph was considered more sensitive, and a previous study reported that it is accurate for subjects with cough deterioration. 24 The findings of this study support the latter results, with the CPF measured with the automatic spirometer being the most accurate.…”

Section: Discussionsupporting

confidence: 83%

“…Regarding the comparison of the CPF values of a pneumotachograph and peak flow meter, the peak flow meter has been shown to have a higher or lower value, and a consensus has not yet been reached. 18,24 The operating principle of the peak flow meter is the measurement of CPF at the position indicated when the piston held by the spring moves according to the expiratory flow rate. In the automatic spirometer, the measurement is derived using the volume calculated from the flow measured using a hot wire-type flow meter.…”

Section: Discussionmentioning

confidence: 99%

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Approaches to Cough Peak Flow Measurement With Duchenne Muscular Dystrophy

et al. 2018

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Approaches to Cough Peak Flow Measurement With Duchenne Muscular Dystrophy

et al. 2018

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“…New MI-E devices measure CPF 4 , however, the use of CPF values to measure cough effectiveness is limited by a lack of agreement between the measurements from different devices. [9][10][11][12] This between-device discrepancy mainly results from differences in frequency responses, i.e. how quickly the measurement device can respond to an instantaneous full-scale flow change.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Four Mechanical Insufflation-Exsufflation Devices: Effect of Simulated Airway Collapse on Cough Peak Flow

et al. 2023

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Background: Mechanical insufflation-exsufflation (MI-E) devices are used to improve airway clearance in individuals with acute respiratory failure. Some MI-E devices measure cough peak flow (CPF) during MI-E to optimize pressure adjustments.The aim was to compare CPF and effective cough volume (ECV: volume expired/coughed above 3 L/sec) measurements between four MI-E devices under simulated conditions of stable versus collapsed airway.Methods: Four MI-E devices were tested on the bench. Each device was connected via a standard circuit to a collapsible tube placed in an airtight chamber that was attached to a lung model with adjustable compliance and resistance. Pressure was measured upstream and downstream the collapsing tube; airflow was measured between the chamber and the lung model. Each device was tested in two conditions: collapse condition (0 cmH 2 O) and nocollapse condition (-70 cmH 2 O). For each condition, 6 combinations of inspiratory/expiratory pressures were applied. CPF was measured at the "mouth level" by the device built-in flow meter and at the "tracheal level" by a dedicated pneumotachograph.Comparisons were performed with non-parametric tests.Results: CPF values measured at the "tracheal level" and ECV values differed between devices for each inspiratory/expiratory pressure in the collapse and no-collapse conditions (P<.0001). CPF values were significantly lower at the "tracheal" level in the collapse as compared with the no-collapse condition (P<.0001 for each device), whereas they were higher at the "mouth" level (P<.05) for three of the four devices.Conclusions: CPF values differed significantly across MI-E devices, highlighting limitation(s) of using only CPF values to determine cough effectiveness: in situations of airway collapse, CPF increases at the "mouth" whereas it decreases at the "tracheal" level.

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“…Comparing values obtained with a pneumotachograph spirometer against a peak flow meter, they described Bland-Altman limits of agreement spanning 338 L/min. 9 In a more recent study in subjects with Duchenne muscular dystrophy, Kikuchi and colleagues 10 compared several cough-augmentation methods and observed differences in CPF readings depending on the measurement device used. The authors reported differences in measurements between a spirometer and a mechanical insufflation-exsufflation device and between a peak flow meter and a spirometer, with Bland-Altman limits of agreement spanning 50 L/min.…”

Section: To the Editormentioning

confidence: 99%