Predictors ID'd for successful removal of mechanical ventilation
Martin Dres, M.D., from St. Michael's Hospital in Toronto, and colleagues recorded electroencephalogram 15 hours prior to SBT in mechanically ventilated patients. The ORP was calculated from four electroencephalogram frequency bands relative to one another, ranging from full wakefulness to deep sleep.
Thirty-seven of the 44 patients enrolled had technically adequate signals. The researchers found that 11 (30 percent), eight (21 percent), and 18 (49 percent) patients passed the SBT and were extubated, passed the SBT but were not deemed ready for extubation, and failed the SBT, respectively. Pathological wake and atypical sleep were highly prevalent; between the groups, the distribution of classical sleep stages was similar. Compared with other groups, extubated patients had higher mean ORP and the ORP was >2.2 for a greater proportion of time for these patients. Patients who failed the SBT had significantly lower correlation between the right and left hemispheres ORP (R/L); the area under the receiver operating characteristic curve of R/L ORP was 0.91 for predicting failure.
Several authors disclosed financial ties to the medical device and appliance industries.
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