Perioperative measurement of the Depth of anaesthesia is currently recommended part of daily anaesthesia good clinical practice. The optimal depth of anaesthesia measured by Bispectral index could be between 40-60. The lower (over 60) depth of anaesthesia could be associated with accidental intraoperative episodes of awareness and deeper (below 40) anaesthesia could lead to higher adverse events or even haemodynamic instability.
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Cumulative time outside recommended BIS levels
Timeframe: intraoperatively
Periods outside recommended BIS levels
Timeframe: intraoperatively