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CLINICAL APPLICATION OF THE ULTRASONIC ATTENUATION OF THE BRAIN Hisao MARUTA 1 1Dept. of the 2nd Surgery, Tokyo Medical and Dental Univ. pp.455-462
Published Date 1965/5/1
DOI https://doi.org/10.11477/mf.1406201841
  • Abstract
  • Look Inside

A reliable procedure for measuring the ultrasonic attenuation of human brain by reflection method using pulse wave of 1. OMC has been established for clinical use. The values of cerebral ultrasonic atten-uation (C. U. S. A.) were estimated in various clinical conditions as follows:

1) In cases of craniotomy (56 cases), the C. U. S. A. was increased as much as 4-8 db on the 2nd and/or the 3rd day after operation with gradual reduction to the resting level until the 5th-10th day. The close parallelism was observed between the C. U. S. A. change and that of the midline echo shift that indicated the increase of cerebal hemisphere volume of the operated side. It was concluded that the C. U. S. A. change was representing the grade of postoperative cerebral edema.

2) In cases of head injury (11 cases), the C. U. S. A. was increased immediately after the accident, followed by a decrease to the resting level at the 2nd or 3rd day in almost of the cases. The reincrease of the C. U. S. A. with the peak value on around the 4th day was observed in some of the cases. The fact that midline echo shift change did not coinci-dented with the early C. U. S. A. increase but only with the secondary C. U.S. A. increase indicated that the former should be due to temporaly cerebral blood circulatory change, while the latter, from the esta-blished cerebral edema.

3) In a case with the dumping syndrome, there was observed a intimate relationship between the C. U. S. A. and the circulatory plasma volume change. The finding further proved that cerebral circulatory change should reflect on the C. U. S. A.

4) During general anesthesia (12 cases), the C. U. S. A. showed a increase which did not exceed over 5db unless marked respirocirculatory complica-tions were occured. The prompt and marked increase of the C. U. S. A. on the complications suggested that it should be useful as a monitoring system during general anesthesia.

A new system with a high reliability for automatic and continuous measurement of the C. U. S. A. has been devised using the ultrasonic transducer with Wide-Beam Searchlight pattern.


Copyright © 1965, 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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