Accidental awareness during general anaesthesia (AAGA) remains a rare but consequential complication with psychological, ethical, and medicolegal ramifications. Contemporary audits suggest explicit recall occurs in approximately 1:20,000 cases overall, with substantially higher risk in specific contexts (neuromuscular blockade, cardiothoracic and trauma surgery, emergency obstetric GA, and hemodynamic instability). Parallel research in the last 15 years reframes “awareness” as a spectrum: beyond explicit AAGA, connected consciousness—transient responsiveness without later autobiographical memory—has been documented using the Isolated Forearm Technique (IFT) in 4–11% around noxious stimuli (e.g., intubation), underscoring gaps in hypnotic continuity rather than wholesale anaesthetic failure.

This keynote synthesizes the latest evidence on incidence, mechanisms, monitoring, prevention, and post-event care. Mechanistically, brief lightening of hypnosis permits thalamocortical processing sufficient for command-following or nociceptive response, yet propofol and midazolam often block hippocampal consolidation, explaining the frequent clinical dissociation: movement or complaint intraoperatively with absent recall postoperatively. Risk concentrates where (1) NMB removes movement as a safety signal, (2) TIVA delivery can be interrupted or underdosed, (3) induction–intubation intervals are not pharmacologically “sealed,” and (4) physiologic constraints mandate lighter anaesthesia.

Monitoring updates emphasize using end-tidal anesthetic concentration (ETAC/MAC) targets for volatile anaesthesia and processed EEG (e.g., BIS, entropy, PSI) to guide TIVA or high-risk cases. Randomized and pragmatic studies indicate that deliberate ETAC targeting can reduce explicit AAGA comparably to BIS in volatile-based care; conversely, pEEG adds particular value when no reliable ETAC exists (TIVA), when NMB is used, or when rapid shifts in depth are expected. IFT research, while mainly investigational, identifies vulnerable windows and validates protocol refinements (e.g., top-up hypnotic before laryngoscopy).

We propose a practical Awareness Prevention Bundle: (1) Preoperative risk stratification and informed discussion for substantially elevated risk (prior AAGA, trauma/cardiac/obstetric GA, TIVA+NMB, substance tolerance). (2) Seal the induction gap—ensure continuous hypnotic effect through airway instrumentation (anticipatory propofol bolus or infusion maintenance; consider ketamine as hemodynamically tolerant adjunct). (3) Anchor depth: maintain ETAC ≥0.7–1.0 MAC during stimulation for volatiles; for TIVA, use structured infusions, secure IV access, and pEEG guidance. (4) Be judicious with NMB; if required, increase vigilance, depth assurance, and alarms. (5) Engineer reliability: rigorous machine/agent checks, low-agent alarms, infusion pump safeguards, and minimizing delivery interruptions during transfers/repositioning. (6) If awareness is suspected, immediately deepen anaesthesia and administer a benzodiazepine to enhance amnesia, document a time-stamped narrative, and activate the postoperative pathway.

Finally, the talk details a standardized post-event pathway: Brice interview (PACU, 24–72 h, ±30 d), empathetic disclosure, screening for distress (e.g., PCL-5, HADS), early referral for trauma-informed psychological support (e.g., CBT), and explicit planning for future anaesthetics (flag in record; pre-briefing; depth strategy). Taken together, these updates shift AAGA prevention from device-centric to process-reliable anaesthesia: intentional dosing, monitored depth, protected transitions, and compassionate aftercare—lowering explicit awareness risk while mitigating the more prevalent, but typically amnestic, episodes of connected consciousness.