A Novel, Contactless, Portable “Spot-Check” Device Accurately Measures Respiratory Rate

DAW, William, KINGSHOTT, Ruth N., SAATCHI, Reza, BURKE, Derek, EVANS, Robert, HOLLOWAY, Alan F., TRAVIS, Jonathan R., JONES, Anthony, HUGHES, Ben R. and ELPHICK, Heather E. (2020). A Novel, Contactless, Portable “Spot-Check” Device Accurately Measures Respiratory Rate. Journal of Medical Devices.

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Link to published version:: https://doi.org/10.1115/1.4046923


Respiratory rate (RR) is an important vital sign used in the assessment of acutely ill patients. It is also used as to predict serious deterioration in a patient's clinical condition. Convenient electronic devices exist for measurement of pulse, blood pressure, oxygen saturation and temperature. Although devices which measure RR exist, none has entered everyday clinical practice. We developed a contactless portable respiratory rate monitor (CPRM) and evaluated the agreement in respiratory rate measurements between existing methods and our new device. The CPRM uses thermal anemometry to measure breath signals during inspiration and expiration. RR data were collected from 52 healthy adult volunteers using respiratory inductance plethysmography (RIP) bands (established contact method), visual counting of chest movements (established non-contact method) and the CPRM (new method), simultaneously. Two differently shaped funnel attachments were evaluated for each volunteer. Data showed good agreement between measurements from the CPRM and the gold standard RIP, with intra-class correlation coefficient (ICC): 0.836, mean difference 0.46 and 95% limits of agreement of -5.90 to 6.83. When separate air inlet funnels of the CPRM were analysed, stronger agreement was seen with an elliptical air inlet; ICC 0.908, mean difference 0.37 with 95% limits of agreement -4.35 to 5.08. A contactless device for accurately and quickly measuring respiratory rate will be an important triage tool in the clinical assessment of patients. More testing is needed to explore the reasons for outlying measurements and to evaluate in the clinical setting.

Item Type: Article
Uncontrolled Keywords: 0903 Biomedical Engineering; 1103 Clinical Sciences; Biomedical Engineering
Identification Number: https://doi.org/10.1115/1.4046923
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 05 May 2020 13:20
Last Modified: 18 Mar 2021 01:17
URI: https://shura.shu.ac.uk/id/eprint/26231

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