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  Indian J Med Microbiol
 

Figure 1 The electroencephalogram (EEG) tracing of the 79-year-old man, weighing 54 kg, who was scheduled for elective laminoplasty at the level of C3–C7. (a) EEG 1 year preoperatively showing normal βwave tracing. (b). EEG during fentanyl induction showing αwaves.

Figure 1 The electroencephalogram (EEG) tracing of the 79-year-old man, weighing 54 kg, who was scheduled for elective laminoplasty at the level of C3–C7. (a) EEG 1 year preoperatively showing normal βwave tracing. (b). EEG during fentanyl induction showing αwaves.