The Bispectral Index during an anaphylactic circulatory arrest

A 47-year-old woman with Cushing's syndrome suffered a severe anaphylactic reaction on induction of anaesthesia, resulting in circulatory an-est. A spontaneous cardiac output appeared after 25 minutes of chest compression and she regained consciousness three hours later, with no neurological deficit. A Bispectral Inch; monitor demonstrated values greater than 40 throughout the whole period of resuscitation. Possible implications for this observation are discussed.