Abstract
This chapter explains that the efficiency of superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis can be studied by adopting two objective and noninvasive methods for assessment; one is the computerized topography electroencephalogram (CT-EEG), and the other is the regional cerebral blood flow (rCBF) study with the 133-xenon inhalation method. This study includes 32 patients who underwent STA-MCA anastomosis for their cerebral ischemic processes (24 males and eight females, mean age 53 years, range 23–71 years). The patency of the anastomosis is confirmed by postoperative angiography in all patients. Pre- and postoperative EEG recordings are made in all cases and each of these recordings is analyzed with CT-EEG. The results of these CT-EEG studies are compared with the results of clinical evaluation and of the serial rCBF studies with the133-xenon inhalation method. In preoperative CT-EEGs, 11 out of 32 patients are clearly visualized high voltage foci in slow wave bands (delta and/or theta) in the symptomatic hemisphere, which is defined as “high voltage slow focus” (HVSF). The serial CT-EEG studies revealed that all of the preoperative HVSFs remained unchanged even after bypass surgery.
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