43 Application of the Moroccan Arabic Bedside Western Aphasia battery-Revised in Acute Stroke Care

Abstract

Objective:

Despite the prevalence of aphasia in Morocco, standardized quick assessment tools are not available for use with patients in acute stroke care. The present study set out to (1) describe the processes of linguistic adaptation of a Moroccan Arabic (MA) version of the Bedside Western Aphasia Battery-Revised (WAB-R), (2) examine the test’s sensitivity to the detection of aphasia in an acute clinical setting, and (3) measure the instrument’s ability to detect improvement in language ability in the acute period.

Participants and Methods:

To achieve the first objective, the English Bedside WAB-R was adapted to Moroccan Arabic by a group of linguists. The instrument’s psychometric properties were established by (1) ascertaining the test’s sensitivity to the presence of aphasia, and (2) verifying the tool’s validity and reliability. Participants included a group of age- and education-matched non-brain-damaged individuals (N = 106), a group of right hemisphere brain-lesioned patients (N = 20), and a group of left hemisphere aphasic patients (N = 52). To accomplish the second and third objectives, the Bedside MA-WAB-R was administered to a group of aphasic participants in the acute period (less than three months post-stroke), and a group of age- and education-matched participants (N = 20). Aphasic patients in the acute stage were tested twice on a seven-day interval (3 days and 10 days post-onset). All data were collected from the Neurology department at the University Medical Hospital Hassan II, and the study received approval from the ethics committee of the Faculty of Medicine and Pharmacy, Sidi Mohammed Ben Abdellah.

Results:

Regarding the first objective, the results indicated that the MA-WAB-R is sensitive to the presence of aphasia, as revealed by the significantly worse performance of the aphasic group on all subtests relative to matched normal and right-hemisphere participants (p = .000). Analyses revealed excellent content and construct validity (correlations between subtests and AQ ranging from .5 to .8) as well as high inter-rater reliability, intra-rater reliability and test-retest reliability (ICC (2,1) > .9). For the second and third objectives, the results supported the test’s sensitivity to the detection of aphasia in the acute phase, as confirmed by the significantly worse performance of aphasic patients relative to matched normal controls (p = .000). The instrument also proved as a reliable measure of language improvement in the acute period, as supported by better scores on the second testing point relative to the first across all subtests.

Conclusions:

The MA-WAB-R is the first standardized assessment tool that can be used for a quick but reliable screening of aphasia in both chronic and acute clinical settings. The test can inform the initial diagnosis of aphasia, and guide a more comprehensive assessment of patients’ spared and impaired linguistic abilities within a context receiving little attention in the aphasia literature.