Abstract
Background
This retrospective study describes electroencephalogram (EEG) parameters in infants and young children under general anaesthesia. The study’s primary objective was to detect determinants of patient state index (PSI) levels.
Methods
We analysed EEG parameters in patients aged 1–36 months who received sevoflurane or propofol as the primary anaesthetic in Beijing Children’s Hospital from September 1, 2019, to April 30, 2020. Patients were stratified into two age groups: 1–12 and 13–36 months. The relationship between EEG parameters and clinical parameters was analysed by multivariable linear regression.
Results
Sixty-two patients were involved in the final analysis, including 35 boys and 27 girls. Average patient age and weight were 14.5 (5.8–24.0) months and 9.9 (8.0–12) kg, respectively. Spectral edge frequency (SEF), PSI and blood pressure were lower (p < 0.001) and burst suppression rate (BSR) and heart rate higher (p < 0.001) at the age of 1–12 months under general anaesthesia. The most significant factor associated with higher levels of PSI was a higher SEF at the age of 1–36 months (1–12 months p = 0.001; 13–26 months p < 0.001); burst suppression occurrence decreased the PSI level (p = 0.031). Older age or higher blood pressure increased PSI levels in children under 1 year old (p = 0.028 and p = 0.002).
Conclusions
SEF was the most significant determinant associated with PSI levels in infants and young children during general anaesthesia, and burst suppression occurrence decreases the PSI level. Moreover, age and blood pressure might affect PSI levels in infants.
A retrospective study of electroencephalogram parameters during general anaesthesia in infants and young children