Abstract
We experienced a case of subarachnoid hemorrhage with different BIS values observed between the right and left forehead. A 71-year-old woman was scheduled for endovascular coiling. She had been already intubated and showed little response to painful stimulation without sedation (Japan coma scale ; III-200). Anesthesia was induced and maintained with propofol. BIS monitoring was started from the right forehead before anesthetic induction (r-BIS), and additional monitoring from the left side was started after induction (l-BIS). When the operation was started, l-BIS was 40 and r-BIS was 30. During the operation, l-BIS was always higher than r-BIS ; l-BIS was 49±10 and r-BIS was 37±7 (mean±SD). The difference between r-BIS and l-BIS was more than 10 for 68% of operation time. Since abnormal EEG pattern was observed, we concluded that abnormal EEG influenced BIS value, and l-BIS after anesthesia was higher than that of her actual conscious level. EEG of a patient with acute stroke sometimes shows an abnormal pattern. Anesthesiologists should keep in mind the possibility that an abnormal EEG might influence BIS value.
Original language | English |
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Pages (from-to) | 1362-1364 |
Number of pages | 3 |
Journal | Japanese Journal of Anesthesiology |
Volume | 56 |
Issue number | 11 |
Publication status | Published - 11-2007 |
All Science Journal Classification (ASJC) codes
- Anesthesiology and Pain Medicine