Depth of Anesthesia and Sedation Monitoring

This is the solution for the daily routine depth of anesthesia monitoring, a standard monitoring tool in a medical institution, thereby increasing the patient’s safety and quality of patient care. Depth of Anesthesia and Sedation Module can be connected to the monitoring host device and transfers parameters of the Brain Activity Index, Signal Quantity Index, Electromiographic Component.

Identified Parameters

AI	Brain Activity Index	Indicates the level of consciousness depression by analyzing EEG, taking into account information on typical signs of anesthetics’ impact on patients
SQI	EEG Signal Quality Index	Reflects noise influence on EEG signal
EMG	Electromyographic Component Level	Indicates the level of electrical activity of facial muscles
Z1, Z2, Z3	Electrode impedance	Demonstrates the quality of electrodes application and electrodes’ electric contact with the patients’ skin

Interpreting AI (Brain Activity Index) Data

AI value	Clinical stages of anesthesia	Clinical signs
90–100	Awake
80–90	Anesthesia stage I — light sedation	Incomplete awakening, patient opens eyes and maintains visual contact in response to a voice for 10 seconds or less
60–80	Anesthesia stage II — sedation	Patient moves and opens eyes in reaction to voice but does not fix the eyes — no visual contact or no response to voice but eye movements and eye opening after a physical stimulation persists
40–60	Anesthesia stage III — surgical state	No response to voice or physical irritants
30–40	Anesthesia stage IV — deep anesthesia, BS (burst–suppression) patterns emerge
20–30	Anesthesia stage V — deeper anesthesia compared to stage IV, length of suppression episodes may reach 10 seconds
0–10	Anesthesia stage VII — extremely deep anesthesia, suppression episodes constitute 75% and more of the whole signal duration