Anesthesiological and Operative Procedures with Potential Cerebral Effects
In addition to anesthesia, further anesthesiological procedures accompanying surgery, the effects of surgery, and operations involving particular stress on the circulation, or phases of such operations, have consequences on the brain, which in the EEG can be determined by large alterations in cerebral function. As always, the reactions of the EEG are fairly stereotype, i.e., various injurious agents lead to similar EEG changes; knowledge of the clinical circumstances is, therefore, required for an evaluation of their significance. The following basic rule can thus be applied: Changes in the EEG in terms of a decelerating frequency and a leveling off of the voltage during the steady state of anesthesia under unchanging clinical conditions should always be taken as a warning signal of a deficient supply of oxygen to the brain. The cause must be detected and treated . Changes toward a deceleration of frequency suggest a reduction in the level of anesthesia, either due to metabolism of the anesthetic or increased ssurgical pain stimuli — as long as other clinical parameters cannot explain such changes.
KeywordsCerebral Perfusion Pain Stimulus Extracorporal Circulation Paper Speed Arousal Reaction
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A. Textbooks and Summaries
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