Anaes Vivas · Intravenous induction agents
Data viva — the bispectral index (BIS) trace
A data viva on the BIS — the dimensionless 0-to-100 processed-EEG measure of anaesthetic depth, the targets (40 to 60 for surgery; above 60 a risk of awareness), the suppression ratio, and its role in titrating a propofol TIVA technique.
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ANZCAFRCAABAEDAIC
Prompt
A processed-EEG monitor displaying a bispectral index (BIS) value that falls from 95 (awake) to 40 (deep anaesthesia) on induction, with a rising burst-suppression ratio in the deeply over-sedated patient.
Stimulus
A processed-EEG monitor displaying the bispectral index (BIS): a value of 95 awake, falling to around 40 after the induction of anaesthesia, with a separate burst-suppression ratio that rises as the patient is driven deeper. Interpret the trace.
References1ShowHide
- [1]Bersten AD, Soni N (eds) Oh's Intensive Care Manual. 8th edition, Elsevier, 2018.