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Brain Oxygen Extraction Fraction as an Indicator for Shunting Operation in Normal Pressure Hydrocephalus Tatsuo MIMA 1 , Takahisa MORI 1 , Ken KAZITA 1 , Takahito NAKAJOH 1 , Kimihiko CHOKYU 1 , Koreaki MORI 1 1Department of Neurosurgery, Kochi Medical School Keyword: normal pressure hydrocephalus , oxygen extraction fraction , cardiac output , shunting operation pp.711-716
Published Date 1999/8/10
DOI https://doi.org/10.11477/mf.1436901760
  • Abstract
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It is still difficult for neurosurgeons to determine which patients with suspected idiopathic normal pres-sure hydrocephalus (NPH) should undergo shunting. We need to find a more accurate indicator to predictthe effect of shunting. We introduced a new preoperative examination of brain oxygen extraction fraction (0EF) and examined whether preoperative OEF value is effective for prediction of the surgical results.Global brain OEF was calculated from oxygen contents of arterial blood (A02) and jugular venous blood(Vj02) selectively sampled from the right jugular bulb using the Seldinger method : OEF= (A02- Vj02)/A02. Since June 1996 we have treated 9 patients suspected of idiopathic and 10 patients suspected ofsecondary NPH. OEF in non-NPH patients with dilated ventricle (n=10) and in infarct patients (n=85)were 0.33 ± 0.02 and 0.38 ± 0.06, respectively. In contrast, 0EF increased both in idiopathic NPH (0.42 ± 0.04) and secondary NPH (0.45 ± 0.02), and the NPH patients with the higher preoperative OEF valuesshowed the better symptomatic recovery. The present study suggests that brain function may be reversiblewhen 0EF can be increased and that OEF can be a useful indicator for predicting the effect of a shuntingoperation in NPH.


Copyright © 1999, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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