Invalid sensors judged by the BIS A-2000 monitors may display clinically acceptable BIS values on the external equipments
Tomita, E.; Takase, H.; Tajima, K.
Masui. Japanese Journal of Anesthesiology 61(11): 1285-1287
2012
ISSN/ISBN: 0021-4892 PMID: 23236941 Document Number: 658815
The bispectral index (BIS) is widely used to measure anesthetic levels in the perioperative period. In our hospital, the BIS monitors (A-2000) are connected to bedside monitors and display BIS values on them through outside input. All datas on the bedside monitors are transmitted to anesthesia information management system automatically. We report cases that were impossible to measure BIS values with the displays of "Invalid Sensor" on the BIS A-2000 sensor, but BIS values were measurable on the bedside monitors. One possible reason is thought that the BIS Quatro Sensor transmits both EEG signals and sensor information to the BIS A-2000 monitor separately. BIS A-2000 monitors may process EEG signals and sensor information individually, and transfer BIS parameters to the external equipments, regardless of sensor information.