Abstract W MP53: The Prevalence and Characteristics of Attention Disorders in The Patients with First-onset Mild Hemorrhagic Stroke

Abstract

Objectives: Recent study revealed that over 50 % of stroke patients had some form of attention deficits. However, few reports focused on acute phase and mild stroke patients. This study aimed to investigate the prevalence of attention disorders and the change of their symptoms during the hospitalization in the patients with first-onset mild hemorrhagic stroke. Methods: Study subjects were 231 consecutive patients diagnosed as hemorrhage stroke and treated at our hospital from 2011 to 2012. Patients with severe hemorrhage (i.e., amount of bleeding >5cc), with previous history of cerebrovascular diseases or dementia, with decreased level of consciousness or with impaired activity of daily living were not eligible to this study. Neuropsychological assessments were conducted by speech therapists at 1 and 2 week after stroke onset using Clinical Assessment for Attention (CAT) and examined how they changed. CAT was a test battery developed by the Japan Society for Higher Brain Dysfunction to evaluate deficit of attention disorders. Results: Among the study subjects, 46 patients met the selection criteria and 16 patients (34.8%, 6 men, mean age was 66) were identified as having attention disorders. Bleeding lesions were left putamen (n=3), right putamen (n=9) and right thalamus (n=4). Significant improvements were observed in two types of focused attention and auditory selective attention measures: percentage of correct answers of Visual Cancellation Task (VCT, p=0.027) and Auditory Detection Task (ADT, p = 0.01). Additionally, working hours in VCT was significantly shortened, and the false-negative rate was also significantly decreased (p= 0.028). In ADT, the false-positive rate was significantly decreased (p= 0.012). No significant changes were observed in other type of tasks. Discussion: More than one-third of patients showed attention deficits even though they had mild stroke. Only focused and selective attentions were improved in acute phase of mild stroke. These results suggested that improvement in focused and selective attention precede improvement in other attentional functions.