Journal of clinical monitoring and computing
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J Clin Monit Comput · Jun 2004
N100 auditory potential and electroencephalogram discriminate propofol-induced sedation levels.
In the present study, we evaluated the electroencephalogram (EEG) and auditory N100 potential (N100) before and during propofol-induced sedation. The aim was to test whether using EEG and N100 the level of sedation may be evaluated. ⋯ Our findings suggest that the combined use of EEG and N100 may help to differentiate the propofol-induced sedation levels, and thus be a useful compliment to clinical sedation scales.
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J Clin Monit Comput · Jun 2004
Facilitated assessment of unconsciousness from morphologic changes in the bilateral posterior tibial nerve cortical somatosensory evoked potential under total intravenous propofol anesthesia during spine surgery.
To describe a unique morphologic feature of the bilateral posterior tibial nerve cortical somatosensory evoked potential, the S-wave, which varies systematically with propofol infusion rate and which appears to be useful in guiding adequate propofol concentration levels during spine surgery. ⋯ The bilateral posterior tibial nerve cortical somatosensory evoked potential changes its morphology in predictable fashion with decreased depth of propofol anesthesia, allowing for anticipation of imminent anesthetic "lightening." It serves as a useful cross-check to Bispectral Index (BIS) or other "level of consciousness" EEG-based algorithms for monitoring depth of propofol anesthesia during prolonged corrective spine surgery.
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J Clin Monit Comput · Jun 2004
Comparative StudyA novel approach to measure cardiac output noninvasively: a comparison with the thermodilution method on critical care patients.
To compare the accuracy and reliability of cardiac output (CO) measurement by a Noninvasive Hemodynamic Analyzer (NHA) to the thermodilution cardiac output (COTD) technique in ICU patients of cardiac condition. ⋯ The results of this retrospective study indicate that the CO(NHA) technique may be a promising screening method. Additional studies are needed to explore its diagnostic trending capability. This noninvasive CO technique has been proven to be clinically accurate and may be applicable for telemedicine applications.
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J Clin Monit Comput · Jun 2004
Increased tidal volume variability in children is a better marker of opioid-induced respiratory depression than decreased respiratory rate.
During opioid administration, decreasing respiratory rate is typically used as a predictor of respiratory depression. Prior to opioid-induced apnea, progressively irregular breathing patterns have been noticed. We hypothesize that opioid administration to children will increase tidal volume variability (TV(var)) and that this will be a better predictor of respiratory depression than a decrease in respiratory rate. ⋯ TV(var) increases as children approach opioid-induced respiratory depression. This is a more useful predictor of respiratory depression than a fall in respiratory rate because the TV(var) increase is 10 times the drop in respiratory rate. A TV(var) increase also correctly predicts respiratory depression twice as often as decreased respiratory rate and is independent of age-related alterations in physiologic respiratory rates.
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J Clin Monit Comput · Apr 2004
Clinical TrialAn on line technique to detect cardiac output variations and cardiovascular performances during abdominal aortic surgery.
Cardiac output (CO) is a parameter usually requested to assess hemo dynamic status of patient and efficacy of therapy especially in critically ill patients. This paper, in line with other research activities and new market availability, intends to correlate a parameter derived from data already acquired in standard patient monitoring (systemic arterial pressure--Pas) in order to identify CO trends and, more generally, to obtain information on the efficiency of cardiovascular system of the patient in examination. ⋯ To evaluate further diagnostic capability of max (dPas/dt), we compare its trend with other parameters but no statistical significant results have been obtained. Therefore the target parameter can be profitably used in the examined patients to monitor CO trend and, in correlation with other parameters, as a sign of efficiency of the cardio circulatory system.