Post-stroke anxiety disorder, independent of depression, appears to be influenced by specific brain lesion locations rather than background characteristics or severity of physical impairment.
A series of 309 admissions to a stroke unit was examined for anxiety symptoms. Patients were diagnosed with DSM-III-R generalized anxiety disorder (GAD) symptom criteria. They were divided into groups of no anxiety (59.2%), worried but not fulfilling GAD criteria (13.9%), and GAD (26.9%). Patients were then divided into depressed and nondepressed groups based on the existence of DSM-III major or minor (dysthymic) depression. These groups were not significantly different in their background characteristics, family or personal psychiatric history, social support or the severity of physical impairment. Anxiety plus depression was associated with left cortical lesions, whereas anxiety alone was associated with right hemisphere lesions. Patients with worry had anterior and patients with GAD had posterior right hemisphere lesions. These findings suggest that anxiety disorder (independent of depression) is not related to background characteristics or to severity of impairment but is, in part, influenced by the brain structures that are injured.
CASTILLO et al. (1993) studied this question.