Relationship Between Bispectral Index (BIS) and Spectral Entropy (SpEn) During Desflurane Anaesthesia

During the last decade, an increasing number of monitor systems were developed designed to assess the depth of anesthesia.

Awareness is a rare occurrence of explicit recalls during anaesthesia with an incidence of 0,18% and the use of cerebral monitoring prevents about 50% of these events.

Different stages of awareness should be defined and implicit memorization is subconscious awareness without explicit recall and possible implicit recall with an incidence greater than awareness.

To assess implicit recalls, a large number of test can be used, for example the "word stem completation test" and the "free recall association test". These result easy to use and reliable in detect implicit memory.

Bispectral Index (BIS) and Spectral Entropy (SpEn) has been proposed, in recent years, as electroencephalographic monitors of anaesthesia depth.