van Loon K, Breteler M J M, van Wolfwinkel L, Rheineck Leyssius A T, Kossen S, Kalkman C J, van Zaane B, Peelen L M
Department of Anesthesiology, University Medical Center Utrecht, Mailstop Q 04.2.313, P.O. Box 85500, 3508 GA, Utrecht, The Netherlands.
Department of Intensive Care, ZGT Hospital, Almelo, The Netherlands.
J Clin Monit Comput. 2016 Dec;30(6):797-805. doi: 10.1007/s10877-015-9777-5. Epub 2015 Sep 30.
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.
呼吸频率改变是需要及时干预的病症的首要症状之一，例如败血症或阿片类药物引起的呼吸抑制。为便于在综合医院病房持续监测呼吸频率，使用调频连续波雷达开发了一种非接触式、无创原型监测仪。我们旨在研究雷达是否能可靠地测量术后患者的呼吸频率。在一项诊断性横断面研究中，使用雷达和参考监测仪（机械通气时使用呼吸流速仪，自主呼吸时使用二氧化碳描记仪）对患者进行监测。纳入了8名患者；在机械通气期间产生了796分钟的观察时间，在自主呼吸期间产生了521分钟的观察时间。消除运动伪影后，机械通气和自主呼吸的偏差及95%一致性界限分别为每分钟-0.12（-1.76至1.51）次呼吸和-0.59（-5.82至4.63）次呼吸。雷达能够准确测量机械通气患者的呼吸频率，但在自主呼吸期间准确性下降。
