M. Niesters, R. Mahajan, E. Olofsen, M. Boom, S. Garcia del Valle, L

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Presentation transcript:

Validation of a novel respiratory rate monitor based on exhaled humidity M. Niesters, R. Mahajan, E. Olofsen, M. Boom, S. Garcia del Valle, L. Aarts, A. Dahan British Journal of Anaesthesia Volume 109, Issue 6, Pages 981-989 (December 2012) DOI: 10.1093/bja/aes275 Copyright © 2012 The Author(s) Terms and Conditions

Fig 1 (a) Humidity tracing obtained from the respiR8 sensor in a volunteer breathing at an RR of 14 bpm. The monitor updates its value every new breath by the calculation of the average breathing rate over the last 3 breaths (i.e. a 3-breath moving average). The trace from the RespiR8 sensors is sampled at 60 Hz (each blue dot is one sample). The subjects start breathing at a rate of 14 bpm at sample # 500. (b) A 68 min tracing of the RR of a volunteer measured with the respiR8 monitor while watching TV. Over the measurement period, the mean breathing rate is 11.4 (sd=2.5) bpm with a range of 6–23 bpm. British Journal of Anaesthesia 2012 109, 981-989DOI: (10.1093/bja/aes275) Copyright © 2012 The Author(s) Terms and Conditions

Fig 2 CONSORT flow chart of the studies in volunteers (a) and patients (b). British Journal of Anaesthesia 2012 109, 981-989DOI: (10.1093/bja/aes275) Copyright © 2012 The Author(s) Terms and Conditions

Fig 3 RR measurements in healthy volunteers (n=20). Population Bland–Altman analysis of respiR8 vs (a) manual counting of thoracic respiratory movements and (b) capnometry-derived RR. In both graphs, the analysis of the combined data set is given (i.e. normal, fast, and slow breathing). The broken green lines are the limits of agreement (±1.96 sd). The analyses indicate that the biases are close to zero for both respiR8 vs manual counting and respiR8 vs capnometry-derived RR. British Journal of Anaesthesia 2012 109, 981-989DOI: (10.1093/bja/aes275) Copyright © 2012 The Author(s) Terms and Conditions

Fig 4 Effect of 2.5 μg kg−1 i.v. fentanyl on RR measured in eight volunteers using the respiR8 on one occasion and a pneumotachograph on another. Values are mean (sem). British Journal of Anaesthesia 2012 109, 981-989DOI: (10.1093/bja/aes275) Copyright © 2012 The Author(s) Terms and Conditions

Fig 5 RR measurements in postoperative patients (n=50). Population Bland–Altman analysis of respiR8 vs ECG-derived RR measurement. The observed bias is 1.72 bpm (continuous green line). The broken green lines are the limits of agreement (±1.96 sd). British Journal of Anaesthesia 2012 109, 981-989DOI: (10.1093/bja/aes275) Copyright © 2012 The Author(s) Terms and Conditions