Ｔｒａｎｓｃｒａｎｉａｌ　ｄｏｐｐｌｅｒ　ｆｌｏｗｍｅｔｒｙによる頭蓋内外血管吻合術後のｂｙｐａｓｓからの血流の分水嶺の同定

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  • Identification of watershed of bypass flow by transcranial doppler flowmetry after extracranial-intracranial bypass surgery.

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The hemodynamics supplied by the extracranial-intracranial bypass was evaluated by the use of the transcranial doppler flowmetry (TCD). 23 extracranial-intracranial bypass surgeries (EC-IC bypass) were performed in 19 patients. The deepest site reached by the blood flow via the bypass in the direction opposite to the normal blood flow of the middle cerebral artery (MCA) was defined watershed. The watershed was identified in MCA at a depth of 4050 mm in 62% of the patients. The velocity of the blood through the bypass was 2140 cm/sec in 68% of the patients, and that of MCA on the deeper side of the watershed was 2160 cm/sec in 77%. No correlation was observed among the depth of the wateshed, the blood velocity via the bypass, the blood velocity of MCA on the deeper side of the watershed and the interval between EC-IC bypass and TCD examination. It is hoped that clinical significance of watershed by TCD will be evaluated in detail.

収録刊行物

  • 脳卒中

    脳卒中 11 (1), 40-45, 1989

    一般社団法人 日本脳卒中学会

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