Abstract
Standard Language Test of Aphasia (SLTA) and regional Cerebral Blood Flow (rCBF) measurement were performed in patients with aphasia fllowing hypertensive intracerebral hemorrhage and cerebral infarction. Relationship between severities of the several elements of SLTA, mean CBF and rCBF patterns were investigated and its results were as follows.
1) Relationship between correct answer rate of SLTA and mean CBF revealed various patterns: elments which contain complexed procedure showed low rate of correct answer, but one with simple procedure disclosed high rate of correct answer. However these elments did not show correlations between mean CBF, while elements with moderate procedure revealed positive correlations to mean CBF.
2) According to the percentage of correct answers in SLTA, the patients with aphasia were divided in four grades, and the following results were obtained.
i) The I grade group showing more than 76% of correct answers revealed a hyperfrontal pattern in all the elements, i. e. hearing, speaking, reading, writing, and calculation. However this hyperfrontal pattern was not noted in patients with cerebal infarction at all. In IV grade group, hypofrontal pattern was seen, however it was noted only in reading.
ii) If the correct answers in SLTA were less than 50% (III and IV grade groups) critical CBF was estimated to be below 25ml ˜ 20ml / 100g brain / min of mean CBF.
3) Factors which have greater influence on critical CBF were as follows: the localized sits as well as extensiveness of focal ischemi, in the latter, the inclusion of speech center or speech zone is particularly important.
