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Evidence Library · Anesthesia

General anesthesia: awareness

Obstetrics carries the highest awareness risk of any surgery.

Accidental awareness during general anesthesia means being conscious during surgery while unable to move. Across all surgery in a UK national audit, it occurred in roughly 1 in 19,600 anesthetics. For cesarean delivery under general anesthesia, the rate was roughly 1 in 670.

The reason is specific to obstetrics. Anesthetic doses are kept deliberately light to protect the baby, and the situation is usually urgent.

1 in 670
Awareness during general anesthesia for cesarean
UK national audit
1 in 19,600
Awareness across all surgery
Same audit

This is a strong argument for regional anesthesia whenever there is time for it, and a strong argument for telling any woman facing general anesthesia that this is a known risk.

Where this comes from:
41. Pandit JJ, Andrade J, Bogod DG, et al. 5th National Audit Project (NAP5) on accidental awareness during general anaesthesia: summary of main findings and risk factors. Br J Anaesth. 2014;113(4):549-559.

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