Charm Engineering Co. Ltd CAI001-BT33 Benutzerhandbuch
CORITICAL ACTIVITY INDEX
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3.4.2 CAI index value (range: 0-100)
CAI index is obtained by processing continuous EEG parameters and it is associated with
hypnosis level of patient. For example, CAI index shows relevance with gradual reduction of
awakening degree and increase of anesthetic depth. CAI index is designed to trace effect
variation of anesthetic medicine acting on patient brain and have relationship with its
awakening degree.
hypnosis level of patient. For example, CAI index shows relevance with gradual reduction of
awakening degree and increase of anesthetic depth. CAI index is designed to trace effect
variation of anesthetic medicine acting on patient brain and have relationship with its
awakening degree.
CAI index should be utilized as the only indicator to control anesthetic medicine dosage. In
most individuals, awake state persists when the CAI index is over “80", however in specially
calm and sedate individuals, awake state may be observed even when the CAI index decreases
to as low as “60”.
most individuals, awake state persists when the CAI index is over “80", however in specially
calm and sedate individuals, awake state may be observed even when the CAI index decreases
to as low as “60”.
Below table shows relationship between CAI index and clinical state of patient.
CAI
Clinical state
100
Awake
80
Sedate (sleep)
60
General anesthesia
30
3.4.3 Signal sensitivity index (SQI, range 0 - 100)
Signal sensitivity index is measured by signal sensitivity of EEG and calculated on the basis of
resistance, intervening element and other parameters. Signal sensitivity index is indicated as a
‘Bar’ form and located on the upper right of the display screen.
resistance, intervening element and other parameters. Signal sensitivity index is indicated as a
‘Bar’ form and located on the upper right of the display screen.
3.4.4 Electromyogram (EMG, range 0 - 100)
CAI contains a filter that can filter most of internally expected EMG intervening elements. EMG
energy is in 80 - 130 Hz of frequency band and displayed on the center of screen. EMG activity
may be increased in below cases during a surgical operation.
energy is in 80 - 130 Hz of frequency band and displayed on the center of screen. EMG activity
may be increased in below cases during a surgical operation.
•
Response to painful stimulus during operation.
•
Body movement or muscle spams
EMG window should be checked often and must check the EMG window when the CAI index
value is increased suddenly.
When the CAI index increases simultaneously with muscular movement, it is likely that EMG will
cause interference. When these phenomena occur, special attention should be taken to clinical
signals of patient during operation.