The performance of Bispectral Index in children during equi-MAC halothane vs. sevoflurane anaesthesia.

Abstract:

BACKGROUND AND OBJECTIVE:The reliability of the Bispectral Index for evaluating and monitoring the depth of general anaesthesia in children is not as great as for that in adults. Therefore we analysed Bispectral Index performance in children by comparing changes in Bispectral Index values during a standardized and equipotent anaesthetic regimen using either halothane or sevoflurane for the induction and maintenance of general anaesthesia. Special interest was focussed on excitation during induction, and whether it was associated with simultaneous changes in Bispectral Index scores. METHODS:Twenty children (3-15 yr, ASA I-II) scheduled for general surgery were randomly allocated to either halothane (10 patients) or sevoflurane group (10 patients). Anaesthesia was induced by 3% halothane or 7% sevoflurane, either agent administered with 50% N2O in oxygen for 5 min, the period from the beginning of induction until intubation. Thereafter, anaesthesia was maintained by the respective volatile agent at 1 MAC (minimum alveolar concentration; in addition to 70% N2O in oxygen) and supplemented with remifentanil infusion adjusted to maintain the heart rate and mean arterial pressure to within 20% of the baseline values. Excitation at induction was defined as involuntary muscular movements. RESULTS:Sevoflurane induction produced a more rapid depression in Bispectral Index than halothane, the mean difference being greatest (47 Bispectral Index score) at 105 s. Excitation occurred in three patients during sevoflurane induction, which coincided with increases in Bispectral Index values in two of the three patients. During the maintenance phase at 1 MAC, the Bispectral Index (mean +/- SD) was 57+/-7 for halothane and 47+/-9 for sevoflurane (P < 0.05). The remifentanil doses did not differ between both groups. CONCLUSION:In children, halothane anaesthesia was associated with higher Bispectral Index values than sevoflurane when administered at 1 MAC. Large individual variation in Bispectral Index occurred within both groups. Due to these limitations, one should be cautious when interpreting paediatric Bispectral Index data.

journal_name

Eur J Anaesthesiol

authors

Taivainen T,Klockars J,Hiller A,Wennervirta J,van Gils MJ,Suominen P

doi

10.1017/S0265021508004845

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

933-9

issue

11

eissn

0265-0215

issn

1365-2346

pii

S0265021508004845

journal_volume

25

pub_type

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