頭部外傷患者におけるBenton視覚記銘検査

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  • Benton Visual Retention Test on the Patients with Traumatic Brain Injury

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After severe head injury, the mentally impaired survivors at their plateau level of recovery need to be evaluated properly for their compensation. Although WAIS-R is an excellent tool to estimate patients' intelligence, the execution of this test requires almost 90 min or more. Since some survivors with traumatic brain injury (TBI) frequently complain of lack of concentration and fatigability during performing the tasks, easily applicable test is strongly expected. In contrast with WAIS-R, Benton visual retention test (BVRT) can be completed within 10 min. We studies whether BVRT can be used as a screening tool for TBI patients before executing the WAIS-R. Twenty-three male and 8 female survivors, with mean age of 49.7 years were examined. Although the manual of the BVRT does not indicate real IQ by the obtained scores of BVRT, we dared to predict IQ (B-IQ) inversely from the BVRT scores. Eighty points or more have been observed for both Fule scale IQ from WAIS-R and B-IQ from BVRT in 6 cases. However, in 5 cases BVRT showed 80 points or less as B-IQ from BVRT, while Fule scale IQ from WAIS-R were between 90 and 120 points. In other 20 cases, both scores were 80 points or below. No cases where B-IQ from BVRT was high and Fule scale IQ from WAIS-R was low has been observed. Cases with high B-IQ always showed high IQ by WAIS-R indicating no additional WAIS-R may be required. Because BVRT needs only 10 minutes or less for execution, we recommended to use BVRT as a screening test to the rather severely disabled patients, and to additionally execute WAIS-R, if B-IQ was lower than 80.

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