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Clinical Significance of Cough Peak Flow and Its Non-Contact Measurement via Cough Sounds: A Narrative Review

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Department of Rehabilitation, Faculty of Health Sciences, Hiroshima Cosmopolitan University, 3-2-1 Otsukahigashi, Asaminami-ku, Hiroshima-shi, Hiroshima 731-3166, Japan
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Department of Electrical, Systems, and Control Engineering, Faculty of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
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Division of Physical Analysis and Therapeutic Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima-shi, Hiroshima 734-8553, Japan
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Department of Physical Therapy, Faculty of Makuhari Human Care, Tohto University, 1-3 Nakase, Mihama-ku, Chiba-shi, Chiba 261-8501, Japan
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Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2782; https://doi.org/10.3390/app10082782
Received: 22 February 2020 / Revised: 10 April 2020 / Accepted: 14 April 2020 / Published: 17 April 2020
(This article belongs to the Section Acoustics and Vibrations)
Coughing is the primary defence mechanism against foreign bodies in the central airways and can quantitatively be assessed by cough peak flow (CPF). We conducted a narrative review of the literature on CPF, which is most commonly used for evaluating cough strength. This review regards the method for measurement of CPF, the cough-related factors influencing CPF, the clinical significance of CPF evaluation, and a novel cough strength prediction method using cough sounds. Furthermore, this review presents various cutoff thresholds that predict extubation failure in patients on mechanical ventilation, acute respiratory failure, and aspiration risk. The published clinical evidence of CPF demonstrates reasonable diagnostic accuracy, predictive power, and validity, although additional studies on the non-contact measurement of CPF via cough sounds with better-quality methodologies are required. View Full-Text
Keywords: cough; cough peak flow; cough strength; cough sounds; mobile device cough; cough peak flow; cough strength; cough sounds; mobile device
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MDPI and ACS Style

Umayahara, Y.; Soh, Z.; Sekikawa, K.; Kawae, T.; Otsuka, A.; Tsuji, T. Clinical Significance of Cough Peak Flow and Its Non-Contact Measurement via Cough Sounds: A Narrative Review. Appl. Sci. 2020, 10, 2782.

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