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CLINICAL APPLICATION OF BARBITURATE IN SEVERE HEAD INJURY : PART 1 : ROLES OF EEG MONITORING Yusuke Sawada 1 , Michitomo Takahashi 1 , Hisashi Sugimoto 1 , Noriyoshi Ohashi 1 , Toshiharu Yoshioka 1 , Tsuyoshi Sugimoto 1 1Department of Traumatology, Osaka University,Medical School pp.625-633
Published Date 1980/6/1
DOI https://doi.org/10.11477/mf.1406204602

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  • Abstract
  • Look Inside

The effects of barbiturate (thiamylal) on changes of EEG, ICP and long term prognosis were investi-gated in 17 patients with severe head injury be-tween JAN/'79 and SEP/'79.

Changes of ICP could be classified into three distinct types with respect to the dosage of thiamylal (15 mg/kg) administered.

i) Type A ; ICP showed a gradual decrease reaching the lowest level within 15-20 minutes of thiamylal administration and recovering the pre-administration level within 60 minutes. There were 7 patients belonging to this type with Good Recovery (GR) in 4, Moderate Disability (MD) in 1, Vegetative state (Veg.) in 1 and Death (D) in 1. After thiamylal administration, these patients exhibited interesting changes on EEG. When the ICP reached the lowest level, a suppression-burst pattern appeared on EEG. With the persistance of the suppression-burst pattern, the ICP remainedin the lowest level attained. The lowest level of the ICP and suppression-burst pattern was main-tained with thiamylal administration of 4-6 mg/kg/ hr.

ii) Type B; The ICP showed a transient fall recovering the pre-administration level within 5 minutes. 4 patients were in this group with Veg. in 1 and death in the remaining 3 cases. A flat pattern on EEG ensued immediately after thiamylal administration and no suppression-burst pattern was observed. Further additional doses of thiamylal produced an abrupt drop in blood pressure with no change in the ICP.

iii) Type C; The ICP showed a decrease with no recovery to the pre-administration level. The EEG maintained a flat pattern leading to death.

The initial ICP was 23.5±1.0 mmHg in type A, 25.2±1.4 mmHg in type B and 29.4±1.4 mmHgin type C. It was impossible to predict the ICP pattern from the initial ICP, with no statistic significant difference among the three groups. From these results, it can be seen that the thiamylal administration produced three types of ICP alteration patterns relating closely to prognosis with GR and MD. Regarding the types B and C, we feel that there is little indication for barbiturate therapy. Also, the suppression-burst pattern on EEG parallels with the lowest ICP level attained.

We conclude that only cases following into type A group will show good prognosis with thiamylal administration and the suppression-burst EEG pattern determines the type A. Retrospective study shows that the barbiturate dosage can be determined by the monitoring of EEG.


Copyright © 1980, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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