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http://crossmark.crossref.org/dialog/?doi=10.1007/s12630-016-0694-y&domain=pdf
Web End = Can J Anesth/J Can Anesth (2016) 63:11541160
DOI 10.1007/s12630-016-0694-y
http://crossmark.crossref.org/dialog/?doi=10.1007/s12630-016-0694-y&domain=pdf
Web End = REPORTS OF ORIGINAL INVESTIGATIONS
Linshom respiratory monitoring device: a novel temperature-based respiratory monitor
Le dispositif de monitorage respiratoire Linshom: un nouveau moniteur respiratoire bas sur la temprature
Jerrold Lerman, MD . Doron Feldman, MD . Ronen Feldman, BS . John Moser, BS . Leeshi Feldman, MD . Madhankumar Sathyamoorthy, MD . Kenneth Deitch, DO . Uri Feldman, PhD
Received: 31 August 2015 / Revised: 23 May 2016 / Accepted: 4 July 2016 / Published online: 13 July 2016 Canadian Anesthesiologists Society 2016
AbstractPurpose We sought to develop a temperature-based respiratory instrument to measure respiration noninvasively outside critical care settings.
Method Respiratory temperature proles were recorded using a temperature-based noninvasive instrument comprised of three rapid responding medical-grade thermistorstwo in close proximity to the mouth/nose (sensors) and one remote to the airway (reference). The effect of the gas ow rate on the amplitude of the tracings
was determined. The temperature-based instrument, the Linshom Respiratory Monitoring Device (LRMD) was mounted to a face mask and positioned on a mannequin face. Respiratory rates of 5-40 breaths min-1 were then
delivered to the mannequin face in random order using articial bellows (IngMar Lung Model). Data from the sensors were collected and compared with the bellows rates using least squares linear regression and coefcient of determination. The investigators breathed at xed rates of 0-60 breaths min-1 in synchrony with a metronome as
their respiratory temperature proles were recorded from sensors mounted to either a face mask or nasal prongs. The recordings were compared with a contemporaneously recorded sidestream capnogram from a CARESCAPE GEB450 Monitor. The extracted respiratory rates from the LRMD tracings and capnograms were compared using linear regression with a coefcient of determination and a Bland-Altman plot.
Results The amplitude of the sensor tracings was independent of the oxygen ow rate. Respiratory rates from the new temperature-based sensor were synchronous and correlated identically with both the articial bellows (r2 = 0.9997) and the capnometer mounted to both the face mask and nasal prongs (r2 = 0.99; bias = -0.17; 95% condence interval, -2.15 to 1.8).
Conclusions Respiratory rates using the LRMD, a novel temperature-based respiratory instrument, were consistent with those using capnometry.
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