Occipital Recording of BIS in Awake Craniotomy
—Case Report—

Abstract

  BIS sensors have been developed as three or four electrodes placed on the forehead. The manufacturer recommends that BIS sensors should be placed in predetermined positions in the frontal region. However, for certain neurosurgical operations, the operating field does not allow frontal placement of the BIS sensor. We have already compared BIS values obtained from frontal and occipital areas during surgery, and BIS showed a strong correlation between frontal and occipital montages. This time, we report 2 cases undergoing Awake Craniotomy with BIS sensors placed on their occipital areas. We were able to get stable recordings of BIS, and evaluate and change the depth of anesthesia during surgery. It may be a significant procedure in Awake Craniotomy to measure BIS with the sensor on the occipital area.