Articles: general-anesthesia.
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Journal of anesthesia · Mar 1995
The patency of the airway via each upper airway orifice during general anesthesia.
The patency of the airway via each orifice was examined during general anesthesia in 112 patients by occluding other orifices in order to develop a method in which fiberoptic endotracheal intubation (FEI) and ventilation could be performed via different orifices. Ventilation was well maintained via the mouth in 61 (54.5%), via bilateral nostrils in 87 (77.7%), and via the unilateral right and left nostril in 67 (59.8%) and 73 (65.2%) patients, respectively. With the aid of an artificial airway, ventilation was well maintained via the mouth in 112 (100.0%), via bilateral nostrils in 111 (99.1%), and via the unilateral right and left nostril in 106 (94.6%) and 105 (93.8%) patients, respectively. Based on these findings, we developed a method in which FEI is performed via the nostril, while ventilation is performed with a mask applied over only the mouth.
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Randomized Controlled Trial Clinical Trial
Effects of intravenous anesthetic agents on middle cerebral artery blood flow velocity during induction of general anesthesia.
Our objective was to quantify the effects of intravenous anesthetics on values measured by or derived from transcranial Doppler sonography (TCD) during induction of general anesthesia. ⋯ Under the circumstances of our study, values derived from TCD measurements responded differently to the agents used to induce general anesthesia in nonneurosurgical patients.
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Randomized Controlled Trial Clinical Trial
The effect of midazolam premedication on implicit memory activation during alfentanil-nitrous oxide anaesthesia.
Eighty-three patients were given midazolam 0.1 mg.kg-1 by intramuscular injection as premedication before general anaesthesia with alfentanil-nitrous oxide. During anaesthesia patients were presented (through headphones) with either statements about common facts of some years ago (group A) (n = 43) or new verbal associations, e.g. names of fictitious, nonfamous people (group B) (n = 40). ⋯ In this study we found no explicit or implicit memory for the auditory information presented during anaesthesia. Midazolam premedication can prevent implicit memory activation during alfentanil-nitrous oxide anaesthesia.
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Randomized Controlled Trial Clinical Trial
EEG bispectrum predicts movement during thiopental/isoflurane anesthesia.
The objective of our study was to test the efficacy of the bispectral index (BIS) compared with spectral edge frequency (SEF), relative delta power, median frequency, and a combined univariate power spectral derivative in predicting movement to incision during isoflurane/oxygen anesthesia. ⋯ When bispectral analysis of the EEG was used to develop a retrospectively determined index, there was an association of the index with movement. Thus, it may be a useful predictor of whether patients will move in response to skin incision during anesthesia with isoflurane/oxygen.