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30 May 2019 : Clinical Research  

Analyzing Electroencephalography (EEG) Waves Provides a Reliable Tool to Assess the Depth of Sevoflurane Anesthesia in Pediatric Patients

Deepti Beekoo1ABCDEF, Kaiming Yuan1CDE, Shuyang Dai1BC, Lifen Chen1CD, Meiqin Di1BD, Sicong Wang1BF, Huacheng Liu2DF, Wangning ShangGuan1ABDEFG*

DOI: 10.12659/MSM.915640

Med Sci Monit 2019; 25:4035-4040

Abstract

BACKGROUND: Studies have reported that BIS is unreliable in children because its algorithm provides misleading information about the actual depth of anesthesia. Raw EEG analysis provides direct neurophysiologic measurement of cerebral activity. The relationship between age and EEG has rarely been reported, thus the aim of the present study was to compare raw electroencephalography (EEG) among different age groups of surgical patients under general anesthesia with 1.0 MAC sevoflurane.

MATERIAL AND METHODS: We enrolled 135 patients aged 0–80 years old (ASA physical status I or II) undergoing surgery, who were divided into 6 groups: 1–12 months old (group 1), 1–3 years old (group 2), 3–6 years old (group 3), 6–18 years old (group 4), 18–65 years old (group 5), and 65–80 years old (group 6). Different raw EEG waves (alpha, delta, and theta) were compared for all subjects.

RESULTS: The BIS values in groups 1 to 6 were 52.2±12.7, 55.0±8.0, 44.5±7.3, 43.8±7.3, 44.2±6.2, and 49.1±6.2 respectively. Compared with groups 1 and 2 (52.2±12.7, 55.0±8.0), BIS values of groups 3, 4, and 5 (44.5±7.3, 43.8±7.3, 44.2±6.2, respectively) were lower (P<0.05). Theta frequency was observed in the 6 groups. The EEG frequencies in groups 1 to 6 were 6.0 (5.5–6.0), 6.0 (5.5–6.0), 6.0 (5.5–6.0), 6.0 (6.0–7.0), 6.3 (6.0–7.0), and 6.0 (5.1–6.0), respectively. Compared with group 6, EEG frequencies in groups 4 and 5 were higher (P<0.05). BIS value was significantly correlated with EEG frequency (R²=0.063, P<0.01).

CONCLUSIONS: Analyzing raw EEG waves provides more accurate judgement of depth of anesthesia, especially in pediatric cases in which monitors often provide misleading values.

Keywords: Age Groups, Anesthetics, Inhalation, Consciousness Monitors, Electroencephalography, Adolescent, Aged, 80 and over, Anesthesia, General, Child, Child, Preschool, Heart Rate, Infant, Monitoring, Intraoperative, Monitoring, Physiologic, sevoflurane

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750