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STABLE XENON CT-CBF STUDY WITH MEASUREMENT OF END-TIDAL XENON CONCENTRATION: CORRECTION BY ARTERIAL CONCENTRATION OF XENON Hajime Touho 1 , Jun Karasawa 1 , Hisashi Shishido 1 , Keisuke Yamada 1 , Yoshinori Yamazaki 1 , Masaaki Asai 2 , Kazuhiro Kawabata 2 , Keisuke Kobayashi 2 , Toshiya Kitamura 2 , Masaaki Kagawa 2 1Department of Neurosurgery, Osaka Neurological Institute 2Division of Radiotechnology, Osaka Neurological Institute pp.603-609
Published Date 1989/6/1
DOI https://doi.org/10.11477/mf.1406206336
  • Abstract
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Non-invasive methods with monitoring end-tidal stable xenon (ETXes) are described for estimating local cerebral blood flow (LCBF) and local parti-tion coefficient (L2). 30% of Xes in oxygen was inhaled for 240 sec and exhaled for 160 sec during serial CT scannings after denitrogenation with pure oxygen breathing.

During the examination, serial samplings of arterial blood and continuous monitoring of ETXes were performed to determine build up range (A) and build up rate constant (K) of artery. Calcu-lated A and K using the arterial sampling (Aa and Ka, respectively) were compared with the calcu-lated A and K using the continuous monitoring of ETXes (Ae and Ke, respectively) in 109 patients with epilepsy, head trauma, or cerebrovascular diseases. Ae and Ke had significantly positive correlation with Aa and Ka, respectively.

In Group 1 of which age was ranging from 0 to 19 years : Ae= O. 75 Aa + 2. 15 (r= 0. 912, n=21, p <O. 001), Ke= O. 67 Ka + O. 69 (r = 0. 898, n=21, p <O. 001), in Group 2 of which age was ranging from 20 to 39 years : Ae= O. 56 Aa + 3. 24 (r= 0. 832, n=20, p <O. 01), in Group 3 of which age wasranging from 40 to 59 years : Ae= O. 91 Aa + 1. 95 (r = 0. 845, n=39, p < O. 001), Ke= O. 38 Ka +1. 32 (r = 0. 719, n=39, p <O. 001), in Group 4 of which age was over 60 years : Ae= O. 52 Aa + 3. 81 (r = 0. 693, n=29, p < O. 001), Ke= O. 31 Ka + 1. 55 (r = 0. 390, n =29, p <O. 001).

In all the groups, Ae and Ke were higher than Aa and Ka, respectively. Calculated LCBF usingAe and Ke were much lower than that using Aa and Ka. Values of LCBF calculated only by Ae and Ke was thought not to be accurate. So, it is necessary for calulation of LCBF that Ae and Ke are revised by Aa and Ka. In this report, the methods of revision of Ae and Ke are discussed.


Copyright © 1989, 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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