Journal of clinical monitoring and computing
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J Clin Monit Comput · Dec 2004
Randomized Controlled Trial Clinical TrialThe effects of two different anaesthesia techniques on bispectral index values and awareness during off-pump coronary artery bypass grafting.
The aim of this study was to evaluate Bispectral Index values and awareness during two different anaesthesia regimens (fentanyl-propofol and fentanyl-midazolam) in patients undergoing off-pump CABG surgery. ⋯ BIS monitoring with clinical signs may be used to assess the adequacy of both types of anaesthesia techniques as well as to detect awareness during off-pump CABG surgery.
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In order to reduce losses of gases through plastic components and to reduce nitrogen accummulation during closed system anaesthesia we investigated either 10 sets of anaesthetic tubing made of silicon as used in standard clinical practice and 10 sets made of latex, which are not used anymore due to concerns about latex allergies. The results were compared to each one set made of conventional industrial rubber. ⋯ If closed anaesthetic systems in the future will be used in intensive care therapy or in case of long lasting procedures in which closed system anaesthesia is proceeded, materials other than silicone should be investigated to avoid regular purging of system and consecutive losses of gas mixtures.
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J Clin Monit Comput · Dec 2004
An algorithm for the detection of individual breaths from the pulse oximeter waveform.
To determine if wavelet analysis techniques can be used to reliably identify individual breaths from the photoplethysmogram (PPG). ⋯ Our technique allows the accurate capture of individual breaths from the photoplethysmogram, and leads the way for developing a simple non-invasive combined respiration and saturation monitor.
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J Clin Monit Comput · Dec 2004
Calculation of O2 consumption during low-flow anesthesia from tidal gas concentrations, flowmeter, and minute ventilation.
We present the principles of a new method to calculate O2 consumption (V*O2) during low-flow anesthesia with a circle circuit when the source gas flows, end-tidal O2 concentrations and patient inspired minute ventilation are known. This method was tested in a model with simulated O2 uptake and CO2 production. ⋯ A similar approach can be used to calculate uptake of inhaled anesthetics. At present, with this method, the limiting factor in precision of measurement of V*O2 and uptake of anesthetic is the precision of measurement of gas flow and gas concentration (especially O2 concentration in end-tidal gas, FETO2) available in clinical anesthetic units.
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J Clin Monit Comput · Dec 2004
Clinical TrialAgreement of an inert gas rebreathing device with thermodilution and the direct oxygen Fick method in measurement of pulmonary blood flow.
Inert gas rebreathing is a well established method for the non-invasive measurement of pulmonary blood flow. We tested the agreement in measurement of pulmonary blood flow (Qt rb) by a new inert soluble gas rebreathing device, the Innocor (Innovision, Copenhagen), with bolus thermodilution (Qt td) and the direct oxygen Fick (Qt Fick) method. ⋯ Acceptable overall agreement between the Innocor and these reference standards was demonstrated.