Journal of clinical monitoring and computing
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J Clin Monit Comput · Apr 2011
Case ReportsNon-invasive cardiac output and oxygen delivery measurement in an infant with critical anemia.
To assess the combination of a non-invasive blood oxygen content (CaO(2)) monitor and a non-invasive cardiac output (CO) monitor to continuously measure oxygen delivery (DO(2); DO(2) = CaO(2) × CO). ⋯ Non-invasive continuous CO and CaO(2) monitors are shown in this single case to provide continuous DO(2) measurement. The ability to assess DO(2) may improve hemodynamic monitoring during goal directed therapies.
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J Clin Monit Comput · Apr 2011
Case ReportsECG myogenic artifacts during clonic seizures: a disturbing (and interesting) finding.
During motor seizures myogenic artifacts may appear on ECG. We report a patient with recurring convulsive seizures involving left side of his body in whom ECG served as a surrogate of electromyography (EMG), showing myogenic artifacts strongly correlated with clonic jerks. ⋯ However, using standard ECG acquisition parameters, muscular activity may be recorded without excessive attenuation of high-frequency myogenic potentials, permitting to indicate the frequency of clonic movements. On the other hand, whenever possible, positioning of ECG surface electrodes on limbs not (or less) involved in clonic epileptic movements may permit to obtain a sufficiently informative ECG recording with less amount of myogenic artifacts, thus providing essential information on heart rate and rhythm.
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J Clin Monit Comput · Apr 2011
Comparative StudyComparison of spectral entropy and BIS VISTA™ monitor during general anesthesia for cardiac surgery.
We compared the primary metrics of the Spectral entropy M-ENTROPY™ module and BIS VISTA™ monitor-i.e., bispectral index (BIS), state entropy (SE), and response entropy (RE) in terms of agreement and correlation during general anesthesia for cardiac surgery. We also evaluated responsiveness of electroencephalogram (EEG)-based and hemodynamic parameters to surgical noxious stimulation, skin incision, and sternotomy, hypothesizing that RE would be a better responsiveness predictor. ⋯ Agreement was poor between the BIS index measured by BIS VISTA™ and SE values at critical anesthesia time points in patients undergoing cardiac surgery. RE was a good predictor of arousal after surgical stimulation regardless of the surgical level of muscle relaxation. Index differences most likely resulted from different algorithms for calculating consciousness level.