Minerva anestesiologica
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The Bispectral Index or "BIS" is a single number, composed from different EEG features, using multivariate statistical methods. It was designed for monitoring the depth of hypnosis during anaesthesia and sedation. ⋯ Unlike univariate measures, such as Spectral Edge Frequency or Median Frequency, the Bispectral Index is drug independent and changes with increasing doses of hypnotics in an almost linear way. Though sophisticated technology, the A-2000 BIS monitor and the BIS sensor are easy to use and also allow non-experts to monitor the depth of hypnosis and sedation on a routine basis.
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Minerva anestesiologica · May 2000
ReviewCytopathic hypoxia. A concept to explain organ dysfunction in sepsis.
The most common cause of death in patients with sepsis is the multiple organ dysfunction syndrome (MODS). One important factor underlying the pathogenesis of MODS may be sepsis-induced alterations in cellular energy metabolism due to acquired intrinsic derangements in cellular respiration, a phenomenon that might be called "cytopathic hypoxia". A number of different biochemical mechanisms have been postulated to account for cytopathic hypoxia in sepsis, including reversible inhibition of cytochrome oxidase by nitric oxide, irreversible inhibition of one or more mitochondrial respiratory complexes by peroxynitrite, and activation of the nuclear enzyme, poly-(ADP-ribosyl)-polymerase.
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Minerva anestesiologica · May 2000
Clinical Trial Controlled Clinical Trial[The utility of bispectral index monitoring in general anesthesia].
The Bispectral Index (BIS), a parameter derived from the electroencephalograph, has been shown to correlate with increasing sedation and loss of consciousness. This study was designed to investigate whether using BIS would improve anaesthetic drug management and immediate recovery after anaesthesia. ⋯ BIS monitoring decreased the consumption of both propofol and sevoflurane and facilitated the immediate recovery after propofol anaesthesia. Intraoperative course was not changed. These findings indicate that the use of BIS may be a valuable guide of the intraoperatively administration of propofol and sevoflurane.
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It is well established that general anesthesia, with or without paralysis, causes profound changes in respiratory function. From a clinical point of view, the more important consequence of this impairment is a decreased efficiency of gas exchange, with a decreased blood oxygenation. The main reason of this respiratory embarrassment is the intraoperative occurrence of atelectasis, mainly in the dependent lung regions. ⋯ As the anesthesia-induced atelectasis are also present in the postoperative period, this ventilatory approach may also be used to prevent this condition. In obese patients PEEP seems to have a major effectiveness than in normal subjects, with an improvement of lung volumes, respiratory mechanics, gas exchange and an occurrence of recruitment. However, further studies are necessary to define optimal value of PEEP and tidal volume for different types of patients.