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Entropy
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Entropy measurement is not indicated for pediatric patients younger than two
years old.
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Entropy is not validated with patients undergoing sedation.
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Unusual or excessive electrical interference is a potential cause for artifact. During
extended periods of electrocautery there may not be any good EEG epochs, and
Entropy values will not be displayed.
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ECG, frequent eye movements, coughing, muscle rigidity and patient movement
cause artifact and may interfere with the measurement. Epileptic episodes may
also cause interference.
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Entropy readings may be inconsistent when monitoring patients with neurological
disorders, traumas or their sequelae.
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Entropy readings may be inconsistent when using benzodiazepines, nitrous oxide
or ketamine as anesthetics.
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Psychoactive medication or very high opiate doses may suppress EEG and cause
inconsistent Entropy readings.
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Cooling the patient may suppress their EEG and cause inconsistent Entropy
readings.
Entropy points to note
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A portion of the Entropy software is derived from the RSA Data Security, Inc. MD5
Message-Digest Algorithm.
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Entropy sensors are disposable, for single-patient use only, and not made with
natural rubber latex.
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Make sure that the sensor connectors of the sensor cable are not in contact with
fluids.
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Always ensure that the sensor is properly attached to the patient and connected
to the cable.
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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 all required regulatory, practice or research information on
brain function monitoring and related topics.
Entropy measurement setup
Entropy equipment to patient connection
2062971-001 CARESCAPE Modular Monitors 351