B40/B20 Patient Monitor
18-2
Overview
Entropy is a non-invasive parameter suitable for adults and pediatric patient population older
than two years of age.
Entropy may be used as an aid in monitoring the effects of certain anesthetic agents on the
patient’s central nervous system (CNS) during general anesthesia. Displaying and using clinical
information from Response Entropy (RE) and State Entropy (SE) may allow the clinician to tailor
the anesthetic according to the individual needs of a patient.
The use of Entropy parameters may help the clinician to improve drug management. It may
also enable a faster recovery from anesthesia and a more predictable wake-up and
extubation.
Prior to using Entropy as an adjunct to guide anesthesia care, it is recommended to review
important situations and limitations that can influence the Entropy number. GE recommends
that clinicians review the following practice advisory that includes a section on brain function
monitoring: The American Society of Anesthesiologists, Practice Advisory for Intraoperative
Awareness and Brain Function Monitoring (Anesthesiology 2006; 104: 847-64). Clinicians are
also recommended to maintain current knowledge of government regulatory, practice or
research information on brain function monitoring and related topics.
Entropy is for monitoring the state of CNS by data acquisition of electroencephalograph (EEG)
and frontal electromyograph (FEMG) signals. The spectral entropies, Response Entropy (RE) and
State Entropy (SE), are processed EEG and FEMG variables. The Entropy measurement is to be
used as an adjunct to other physiological parameters.
Response Entropy (RE) and State Entropy (SE) may be used as an aid in monitoring the effects of
certain anesthetic agents, which may help the user titrate anesthetic drugs according to the
individual needs of patients. Furthermore, the use of Entropy parameters may be associated
with a reduction of anesthetic use and faster emergence from anesthesia.
The Entropy module and accessories are indicated for use by qualified medical personnel only.
Figure 18-1 Entropy measurement connector
Entropy
connector
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