Baseline bispectral index values below 46 in an octogenarian under desflurane anesthesia.

摘要

The Bispectral Index? (Aspect Medical Systems, Newton, MA, USA), a set of variables ranging from 0 to 100 that correlate with the degree of patient sedation, has been used to monitor the depth of anesthesia. Values < 60 correlate with a small probability of consciousness1 and a bispectral index (BIS) value in the range of 40 to 60 has been recommended for adequate depth of anesthesia.A Dementia may be associated with an increase in slow-wave and a decrease in fast-wave electroencephalogram activity that leads to a reduction of the BIS baseline in the awake state.2 Bispectral index values are significantly lower in geriatric patients with Alzheimer's disease or vascular dementia than they are in geriatric patients without these conditions.3 In a nonagenarian, emergence from propofol anesthesia has been described at a BIS value of 52.