Journal of clinical monitoring and computing
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J Clin Monit Comput · Apr 2002
Averaging improves the quality of impedance stroke volume measurements during the head up tilt test.
To assess the improvement in quality following averaging data from two or more tilts in the stroke volume (SV) response curve during a head-up tilt test. ⋯ Impedance measurements can be very variable, making the assessment of SV changes during a head-up tilt test difficult. By averaging the data from several tilts one can improved the quality of the SV wavelet sufficiently to identify important postural changes.
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New methods of data processing combined with advances in computer technology have revolutionized monitoring of patients under anesthesia. The development of systems based on analysis of brain electrical activity (EEG or evoked potentials) by neural networks has provided impetus to many investigators. Though not claiming to be the end-all in patient monitoring, the potential and efficiency of the combination does indeed stand out. Various strategies are presented and discussed, as well as suggestions for further investigation.
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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.