BACKGROUND: Postoperative monitoring of ventilation is largely restricted to the measurement of haemoglobin-oxygen saturation and respiratory rate (RR) derived from the ECG. measurement is inadequate when used with supplemental oxygen and ECG-derived RR is subject to artifacts. A new monitor measures RR by quantifying the humidity of exhaled air (respiR8(®)). METHODS: The accuracy of the system was tested using a breathing simulator. In healthy volunteers, the respiR8(®) monitor was compared with two other methods of measuring RR: capnometry and counting of thoracic breathing movements. The ability of the monitor to track changes in RR resulting from the infusion of 2.5 μg kg(-1) fentanyl was assessed and compared with RR measured from a validated flow measurement system. The RR in 50 postoperative patients measured with the respiR8(®) was compared with that derived from the ECG. RR values were compared by population-based Bland-Altman analyses. RESULTS: The respiR8(®) monitor was accurate in the range required in clinical practice. There was a close agreement between RR from respiR8(®), capnometry, and manual counting of respiratory movements without bias (limits of agreement ±1 bpm). The respiR8(®) monitor was well able to accurately track RR changes from fentanyl. In postoperative patients, RR from respiR8(®) and ECG had a bias of 1.7 (5.7) bpm due to greater RR values observed from the ECG due to artifacts. CONCLUSIONS: The respiR8(®) gives an accurate measurement of RR and is useful in postoperative care.
BACKGROUND: Postoperative monitoring of ventilation is largely restricted to the measurement of haemoglobin-oxygen saturation and respiratory rate (RR) derived from the ECG. measurement is inadequate when used with supplemental oxygen and ECG-derived RR is subject to artifacts. A new monitor measures RR by quantifying the humidity of exhaled air (respiR8(®)). METHODS: The accuracy of the system was tested using a breathing simulator. In healthy volunteers, the respiR8(®) monitor was compared with two other methods of measuring RR: capnometry and counting of thoracic breathing movements. The ability of the monitor to track changes in RR resulting from the infusion of 2.5 μg kg(-1) fentanyl was assessed and compared with RR measured from a validated flow measurement system. The RR in 50 postoperative patients measured with the respiR8(®) was compared with that derived from the ECG. RR values were compared by population-based Bland-Altman analyses. RESULTS: The respiR8(®) monitor was accurate in the range required in clinical practice. There was a close agreement between RR from respiR8(®), capnometry, and manual counting of respiratory movements without bias (limits of agreement ±1 bpm). The respiR8(®) monitor was well able to accurately track RR changes from fentanyl. In postoperative patients, RR from respiR8(®) and ECG had a bias of 1.7 (5.7) bpm due to greater RR values observed from the ECG due to artifacts. CONCLUSIONS: The respiR8(®) gives an accurate measurement of RR and is useful in postoperative care.
Authors: Sebastian Zaremba; Christina H Shin; Matthew M Hutter; Sanjana A Malviya; Stephanie D Grabitz; Teresa MacDonald; Daniel Diaz-Gil; Satya Krishna Ramachandran; Dean Hess; Atul Malhotra; Matthias Eikermann Journal: Anesthesiology Date: 2016-07 Impact factor: 7.892
Authors: Suzanne Jl Broens; Xuan He; Rachel Evley; Erik Olofsen; Marieke Niesters; Ravi P Mahajan; Albert Dahan; Monique van Velzen Journal: Ther Clin Risk Manag Date: 2017-08-26 Impact factor: 2.423