Journal of clinical monitoring and computing
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J Clin Monit Comput · Feb 2002
Automatic analysis and monitoring of burst suppression in anesthesia.
We studied the spectral characteristics of the EEG burst suppression patterns (BSP) of two intravenous anesthetics, propofol and thiopental. Based on the obtained results, we developed a method for automatic segmentation, classification and compact presentation of burst suppression patterns. ⋯ Our results show that burst suppression caused by the different anesthetics can be reliably detected with our segmentation and classification methods. The analysis of normal and pathological EEG, however, should include information of the anesthetic used. Knowledge of the normal variation of the EEG is necessary in order to detect the abnormal BSP of, for instance, seizure patients.
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J Clin Monit Comput · Feb 2002
Comparative StudyA comparison of two impedance cardiographs using head-up tilting and trend analysis.
To compare the performances of two impedance cardiographs, the RheoCardioMonitor (RCM) and the BoMed NCCOM3, using trend analysis. This involved a series of head-up tilts, a simulation of the stroke volume (SV) and cardiac output (CO) response, calculation of prediction errors and cumulative sums (Cusum). ⋯ Simulation of a physiological response, such as that to head-up tilting, and using a trend analysis based on prediction errors and Cusum, is a useful technique. The trending abilities of the RCM and BoMed were similar.
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J Clin Monit Comput · Feb 2002
New possibilities in prognostication of hemodynamic instability during surgical operations.
The new approach to intraoperative hemodynamics disorders prognostication which caused of inadequate anaesthesiological protection is presented in this research. Hemodynamic parameters stability both with systemic homeokinesis state were investigated in 28 patients with various surgical diseases. ⋯ Instability of homeostatic regulation was controlled with special original analysis of cardiac rhythm entropy dynamics chaotisity in multidimensional faze space of existence. It is established that numerical criterion of cardiac rhythm chaotic state degree exceeds the intended acceptable level 5-10 minutes before clinical signs of hemodynamics instability developing in all inadequate anaesthesiological protection cases.
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J Clin Monit Comput · Feb 2002
Validity of gastric intramucosal pH (pHi) for circulatory evaluation in pediatric patients.
To determine if the measurement of gastric intramucosal pH (pHi) is useful for evaluation of circulatory status of critically ill pediatric patients. ⋯ pHi can be a useful parameter for evaluating the circulatory status of critically ill pediatric patients; it allows reliable evaluation of splanchnic and peripheral perfusion.
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J Clin Monit Comput · Feb 2002
Time-variant investigation of quadratic phase couplings caused by amplitude modulation in electroencephalic burst-suppression patterns.
Several studies suggest that parameters derived from bispectral analysis of the EEG can be used to characterize specific cortical activation states represented by non linear interaction between brain electrical oscillations. For example, it was shown that so-called bispectral indices can be used to assess the depth of sedation. The methods applied so far are based on interval-related procedures of bispectral analysis. Consequently, the use of the resulting parameters for on-line monitoring or investigations of signal properties during transition periods, e.g., when entering burst-suppression periods, is restricted. The objective of this paper is to provide the methodological basis for a time-continuous (on-line) investigation of quadratic phase coupling induced by amplitude modulation. ⋯ It was found that these periods are associated with increasing DAM compared with the baseline conditions.