General Anaesthesia Clinical Trial
Official title:
Can CSM Monitor Depth of Anaesthesia Just as Good as BIS?
This study aims to test whether two depth-of-anaesthesia-monitors can perform equally well in monitoring anaesthetic sleep, both at induction and emergence from anaesthesia and during surgery.
There is a considerable variation in the need of anaesthetics for the individual patient.
For measuring the hypnotic component (i.e. sleep) during anaesthesia, no reliable monitoring
system was available before Bispectral Index, BIS (Aspect Medical) was commercially launched
about ten years ago. BIS is based on complex mathematical and statistical processing of the
electroencephalogram, EEG.
A widespread use of BIS has been limited in part by high costs. Last year a considerably
cheaper EEG monitor, Cerebral State Monitor, CSM (Danmeter), was launched into the marked.
The validation of CSM is so far limited to very few cases comparing BIS and CSM offline. No
large scaled clinical study has been performed to test whether CSM also reflects depth of
hypnosis in a reliable way.
We set up a study on 60 relatively healthy patients, undergoing various kind of surgery in
general anaesthesia. The study is approved by the Regional Committee of Ethics in Medicine,
Health Region East, and all patients give written informed consent. Both monitors (BIS and
CSM) are applied to the patients, but only information from BIS is available for the
anaesthetist throughout surgery. Information from the two monitors and from the routine
monitoring equipment as well as from the actual delivery of anaesthetics is sampled online
into a designed data program (Rugloop, Demed, Belgium).
The output from BIS and CSM will afterwards be analyzed together with statistical experts,
to see if CSM can predict the time for falling asleep and time for awakening just as good as
BIS. The curves for the two monitors will also be compared, qualitatively and
quantitatively, to see if they perform equally well.
Inclusion criterias:
- Written informed consent
- ASA 1-3
- Age 18 - 75
- Surgery in all parts of the body except from the face/head in general anaesthesia;
surgery expected to last for 30 - 120 minutes
Exclusion criterias:
- Extreme over- or underweight
- Epilepsy or other conditions or medications that would probably influence on the EEG
- Alcohol- or drug abuse
- Contraindication for the actual anaesthetics, being propofol and remifentanil
;
Time Perspective: Prospective
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