Comparison of acoustic and impedance methods with mask capnometry to assess respiration rate in obese patients recovering from general anaesthesia
- 10 July 2014
- journal article
- research article
- Published by Wiley in Anaesthesia
- Vol. 70 (1), 26-31
- https://doi.org/10.1111/anae.12799
Abstract
Respiratory depression, a potentially serious complication after general anaesthesia, can be detected promptly by close monitoring of both oxygen saturation and respiratory rate. Obese patients have morphological changes that may impair the reliability of monitoring devices. In this study, respiration rate was simultaneously recorded every second for up to 60 min using a computer in 30 adult obese patients (body mass index ≥ 35 kg.m(-2)), by three methods: acoustic; thoracic impedance; and capnometry via a facemask (Capnomask, reference method). Of the 99,771 data triplets collected, only 85,520 (86%) were included; 12,021 (84%) were not studied due to failure of capnometry and 2240 (16%) due to failure of the acoustic method. Compared with capnometry, bias was similar using both the acoustic method and impedance (-0.3 bpm vs. -0.6 bpm, respectively, p = 0.09), but limits of agreement were narrower for the acoustic method (±3.5 bpm vs. ±5.3 bpm, respectively, p = 0.0008). The proportion of respiration rate values obtained with the acoustic method and impedance that differed by at least 10% or 20% for more than 15 s were 11% vs. 23% and 2% vs. 6%, respectively (p = 0.0009 for both comparisons). The acoustic sensor was well tolerated, while the facemask was pulled off on several occasions by four (13%) agitated patients. In obese patients requiring close monitoring of respiration rate, the acoustic method may be more precise than thoracic impedance and better tolerated than capnometry with a facemask.Keywords
Funding Information
- University Hospital of Poitiers
This publication has 14 references indexed in Scilit:
- Accuracy of acoustic respiration rate monitoring in pediatric patientsPediatric Anesthesia, 2013
- The Accuracy, Precision and Reliability of Measuring Ventilatory Rate and Detecting Ventilatory Pause by Rainbow Acoustic Monitoring and CapnometryAnesthesia & Analgesia, 2013
- Comparison of Acoustic Respiration Rate, Impedance Pneumography and Capnometry Monitors for Respiration Rate Accuracy and Apnea Detection during GI Endoscopy AnesthesiaOpen Journal of Anesthesiology, 2013
- Capnography and chest-wall impedance algorithms for ventilation detection during cardiopulmonary resuscitationResuscitation, 2010
- Accuracy of Postoperative End-tidal Pco2Measurements with Mainstream and Sidestream Capnography in Non-obese Patients and in Obese Patients with and without Obstructive Sleep ApneaAnesthesiology, 2009
- Obstructive Sleep Apnea of Obese AdultsAnesthesiology, 2009
- Thoracic impedance monitoring of respiratory rate during sedation – is it safe?Anaesthesia, 2009
- Agreement Between Methods of Measurement with Multiple Observations Per IndividualJournal of Biopharmaceutical Statistics, 2007
- Practice Guidelines for the Perioperative Management of Patients with Obstructive Sleep ApneaAnesthesiology, 2006
- Supplemental Oxygen Impairs Detection of Hypoventilation by Pulse OximetrySocial psychiatry. Sozialpsychiatrie. Psychiatrie sociale, 2004