J.Jpn. Surg. Soc.
ISSN 1880-1129

[Abstract] [Full Text PDF] （in Japanese / 3107KB） [Members Only And Two Factor Auth.]

J.Jpn. Surg. Soc.. 59(13): 2073-2077, 1959

ELECTRICAL INTERFERENCES AGAINST ELECTROENCEPHALOGRAPHIC RECORDING DURING OPERATION (2ND REPORT)

1) Surgical Center, Tokyo University School of Medicine
2) Department of Electricity, Tokyo University School of Technology

Kazuo TAKEUCHI1), Kentaro SHIMIZU1), Seiji KIMOTO1), Shigeru HATANO1), Tadanobu TAKAGI1), Masanobu ISHIDA1), Takefusa SAKAMOTO2), Sueo TAKAGI2)

According to the result of the previous experiment of the authors, motions and dresses of persons present in the operating room must be specially payed attension in order to exclude electrical interferences against electroencephalographic recording during operation. This time the following experiments were performed in order to analyse quantitatively those interferences and to establish the measures for exclusion of interferences.
1. Movement of the source of the interferences. No noise was observed by movement of the charged metal plate locating near the patient.
2. Mechanism of the appearance of the noise. Higher static electricity which is suddenly changing by rubbing of dresses is responsible for the occurrence of the noise.
3. Location of the source of the noise. The noise was heaviest when the source is located on the bilateral sides of the patient, and was less remarkable in the cranial and caudal directions of the patient.
Exclusive measures of the noise caused by persons present in the operating room, will be mentioned below.
Number of persons present in the operating room must be kept as small as possible. Dresses of the persons must be kept as thin as possible. Same material should be used for dresses. Nylon and wool which are expected to be the main source of the interferences, because of the higher static electricity occuring by rubbing, should be avoided. Whereas, cotton should be used, because it situates quite near to the human body in the Farady Series. Besides, the humidity of the operating room must not be kept much lower.
Because it is very difficult to establish the critical condition for the exclusion of the interferences against electroencephalographic recording during operation, even the smallest attension must be payed to the motions and dresses of persons present in the operating room.
(authors' abstract)

<< To previous page

To read the PDF file you will need Adobe Reader installed on your computer.