Use of Tc-99m HMPAO Brain SPECT to Evaluate Cerebral Collateral Circulation During Matas Test

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Abstract
Five patients with traumatic carotid-cavernous fistulae and two patients with internal carotid artery aneurysms inside the cavernous sinus are presented. A quantitative method was used for the evaluation of brain collateral circulation in the anterior and middle cerebral artery territories by using Tc-99m HMPAO SPECT before and during the Matas test. It affords a more reliable quantitative measurement of reduced activity than conventional carotid angiography during the Matas test. In this study, a reduction of radioactivity of less than 15% during the Matas test did not reveal any postoperative neurological deficit after a carotid artery trapping procedure. This noninvasive method seems to be useful to determine the appropriate surgical treatment.

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