• K van Loon, M J M Breteler, L van Wolfwinkel, A T Rheineck Leyssius, S Kossen, C J Kalkman, B van Zaane, and L M Peelen.
• Department of Anesthesiology, University Medical Center Utrecht, Mailstop Q 04.2.313, P.O. Box 85500, 3508 GA, Utrecht, The Netherlands. K.vanLoon-3@umcutrecht.nl.
• J Clin Monit Comput. 2016 Dec 1; 30 (6): 797-805.

AbstractAltered 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.

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