METHOD OF VISUALIZING PATIENT'S CONDITION TO MONITOR ADEQUACY OF ANESTHESIA Russian patent published in 2023 - IPC A61B5/533 

FIELD: medicine; anesthesiology; resuscitation; intensive care; rehabilitation.

SUBSTANCE: invention can be used to assess the adequacy of anesthesia. Skin conductivity is recorded. The frequencies of fluctuations of the phasic component of skin conductance are determined in 5-second epochs over a time interval. The variability of the phasic component of skin conductivity is determined using the formula , where PV is the variability of the phasic component of skin conductance; σ is standard deviation; IP is the value of the oscillation frequency of the phasic component of skin conductivity averaged over a 1-minute interval. Then the index of sympathetic reactivity is calculated , where PVL is the index of sympathetic reactivity. Sympathetic dominance index is calculated , where SDI is the sympathetic dominance index, IP is the value of the oscillation frequency of the phasic component of skin conductance averaged over a 1-minute interval. PVL and SDI values are graphically displayed in real time, with PVL values corresponding to the ordinate axis and SDI to the abscissa axis. Based on the location of the points corresponding to the paired PVL and SDI values in the coordinate system, the adequacy of anesthesia is assessed. If the points are in the lower left quadrant, then nociceptive stimuli and perception of external stimuli are absent, analgesia and sedation correspond to the current needs of the patient. If the points are in the lower right quadrant, then there are no nociceptive stimuli, intraanesthetic awakening is possible. The location of the points in the upper right quadrant corresponds to active wakefulness. The location of the points in the upper left quadrant corresponds to painful stimuli in an unconscious patient.

EFFECT: method ensures the prevention of excessive or insufficient anesthesia by assessing the adequacy of anesthesia by determining PVL and SDI.

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