Published in:
Open Access
01-12-2016 | Original Research
Wireless non-invasive continuous respiratory monitoring with FMCW radar: a clinical validation study
Authors:
K. van Loon, M. J. M. Breteler, L. van Wolfwinkel, A. T. Rheineck Leyssius, S. Kossen, C. J. Kalkman, B. van Zaane, L. M. Peelen
Published in:
Journal of Clinical Monitoring and Computing
|
Issue 6/2016
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Abstract
Altered respiratory rate is one of the first symptoms of medical conditions that require timely intervention, e.g., sepsis or opioid-induced respiratory depression. To facilitate continuous respiratory rate monitoring on general hospital wards a contactless, non-invasive, prototype monitor was developed using frequency modulated continuous wave radar. We aimed to study whether radar can reliably measure respiratory rate in postoperative patients. In a diagnostic cross-sectional study patients were monitored with the radar and the reference monitor (pneumotachograph during mechanical ventilation and capnography during spontaneous breathing). Eight patients were included; yielding 796 min of observation time during mechanical ventilation and 521 min during spontaneous breathing. After elimination of movement artifacts the bias and 95 % limits of agreement for mechanical ventilation and spontaneous breathing were −0.12 (−1.76 to 1.51) and −0.59 (−5.82 to 4.63) breaths per minute respectively. The radar was able to accurately measure respiratory rate in mechanically ventilated patients, but the accuracy decreased during spontaneous breathing.