Journal of clinical monitoring and computing
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J Clin Monit Comput · Jun 2009
Clinical TrialHaemodynamic changes during craniotomy monitored by a bioimpedance plethysmographic noninvasive cardiac output monitor.
Profound cardiovascular changes may occur at various stages during a craniotomy. These changes require a detailed haemodynamic analysis including cardiac output. In the present study, we used a monitor based on electrical bioimpedance method for noninvasive cardiac output measurement. ⋯ Bioimpedance plethysmography is a useful noninvasive technique for monitoring and detailed analysis of the rapidly changing systemic haemodynamics during a craniotomy. The device could be useful for investigating important haemodynamic changes in specific neurosurgical settings.
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J Clin Monit Comput · Jun 2009
Case ReportsOxygraphy: an unexplored perioperative monitoring modality.
Capnography waveforms and capnometry are useful perioperative monitoring tools. The paramagnetic oxygen analyzers incorporated in many clinical monitoring systems estimate oxygen concentration in the breathing circuit during various phases of ventilation. The oxygen concentration is plotted as a real-time waveform and displayed as an oxygraph. ⋯ The oxygraphy peak-to-baseline scale difference can be compressed to as low as to 6% of oxygen concentration. When the peak-to-baseline scale difference is 6 mmHg, the oxygraph becomes sensitive to even minute changes in respiratory flow characteristics. Oxygraphy may have a potential role in clinical monitoring.
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J Clin Monit Comput · Jun 2009
Differential effect of halothane on motor evoked potentials elicited by transcranial electric or magnetic stimulation in the monkey.
Halothane (HAL) is known to depress motor evoked potentials produced by transcranial magnetic (tcMMEP) or transcranial electric (tcEMEP) stimulation. This study was designed to determine if differences existed between tcEMEP and tcMMEP with increasing HAL concentra- tions. ⋯ These differences in sensitivity to HAL are consistent with other studies with intravenous anesthesia and are consistent with the known difference in the physiological mechanisms by which magnetic and electrical stimulation activates the motor cortex.