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The BIS value is a single numeric value on a scale from 0 to 100.
The child had an extremely low Bispectral Index (BIS) value prior to undergoing general anesthesia.
Maintenance of a BIS value between 40 and 60 denotes adequate sedation during general anesthesia.
In this case, the sudden decrease in BIS value did not indicate cerebral hypoperfusion.
First, the sudden decrease in unilateral BIS value did not appear to be associated with cerebral hypoperfusion.
Findings in our case suggest that a sudden decrease in BIS value is not always associated with cerebral hypoperfusion.
Morimoto et al. described a case in which the BIS value was 0, possibly because of cerebral hypoperfusion [2].
The BIS value is a number between 0 and 100, BIS values near 100 being considered "awake".
Presumably, the suppression ratio may give more information in combination with the BIS value than the latter value alone.
One of the predominant confounders is high EMG activity interference which is known to falsely elevate the BIS value [17].
Table 2 BIS monitoring (mean ± SD) Placebo Remifentanil BIS value before fiberoptic bronchoscopy 36 ± 12 36 ± 11 >0.05 Maximum BIS value during procedure 53 ± 8 54 ± 11 >0.05 BIS value post fiberoptic bronchoscopy 42 ± 6 46 ± 9 >0.05 Figure 4 Box plot of BIS variation during procedure with mean (box plot) with median, interquartile (25 th –75 th ), minimum and maximum values and outliers.
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