Journal of clinical monitoring and computing
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J Clin Monit Comput · Apr 2002
Improving accuracy of the chemiluminescent analyser for measurement of nitric oxide and nitrogen dioxide in respired gas.
The aim of this study was to improve the accuracy of the chemiluminescent analyser in the measurement of nitric oxide (NO) and nitrogen dioxide (NO2) in both dry and humidified gas mixtures containing oxygen (O2) in varying concentrations. This work was performed because initial attempts to determine rate constants for the decay of NO and rates of formation of NO2 were unsuccessful. ⋯ This study indicates that for accurate analysis of NO and NO2 concentrations in airway gases a rigorous calibration of the instrument for the conditions applying in the experiment is mandatory. Once this is achieved the instrument is capable of precise analysis of both gases.
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J Clin Monit Comput · Apr 2002
Bilobed splitting of median nerve somatosensory evoked p14 potential under deep hypothermia.
To further elucidate temperature related changes in subcortical components of somatosensory evoked potentials (SEP) in intraoperative monitoring. ⋯ Deep hypothermia may separate presynaptic and postsynaptic electric activity of evoked potentials that overlap at normal body temperature. Such possible phenomena must be kept in mind to correctly interprete monitoring data at very low body temperatures and may help in better understanding the generation of different SEP components.
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J Clin Monit Comput · Apr 2002
Monitoring pulmonary function with superimposed pulmonary gas exchange curves from standard analyzers.
A repetitive graphic display of the single breath pulmonary function can indicate changes in cardiac and pulmonary physiology brought on by clinical events. Parallel advances in computer technology and monitoring make real-time, single breath pulmonary function clinically practicable. We describe a system built from a commercially available airway gas monitor and off the shelf computer and data-acquisition hardware. ⋯ This paper describes a real-time, single breath pulmonary monitoring system that displays three parameters graphed against time: expired flow rate, oxygen uptake and carbon dioxide production. This system allows for early and rapid recognition of treatable conditions that may lead to adverse events without any additional patient measurements or invasive procedures. Monitoring systems similar to the one described in this paper may lead to a higher level of patient safety without any additional patient risk.
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J Clin Monit Comput · Apr 2002
Automated evaluation of functional residual capacity by oxygen washout.
Measurement of functional residual capacity (FRC) is of considerable interest for monitoring ventilated patients in ICUs. However, the lack of instruments that can be used in the clinical setting has so far impeded the routine application of this measurement. It was the aim of our study to evaluate the accuracy and the reproducibility of a simplified oxygen washout technique (FRC[O2]). ⋯ The automated oxygen washout technique is a simple method to measure FRC in the ICU patient.