Aphasia severity: Association with cerebral perfusion and diffusion

Area of Science:

• Neurology
• Neuroimaging
• Speech-Language Pathology

Background:

• Previous research indicates cerebral hypoperfusion may better reflect neurological status than lesion size in early stroke recovery.
• The relationship between perfusion, diffusion, and aphasia severity remains unclear.

Purpose of the Study:

• To investigate the association between cerebral perfusion, diffusion, and aphasia severity in stroke patients.
• To determine if hypoperfusion or lesion volume is a more accurate indicator of aphasia severity.

Main Methods:

• Nine participants were assessed within 24 hours of stroke onset, with six re-evaluated at 1 month.
• Evaluations included aphasia testing, face recognition tasks, and T2-, perfusion-, and diffusion-weighted MRI.
• Analysis focused on correlations between aphasia severity, hypoperfusion, and lesion volume.

Main Results:

• Aphasia severity significantly correlated with hypoperfusion at both day 1 and 1 month post-stroke.
• No statistically significant correlation was found between aphasia severity and lesion size at either time point.
• Perfusion abnormalities were visually larger than the actual lesion in most subjects at day 1.

Conclusions:

• Cerebral hypoperfusion is a more accurate indicator of aphasia severity in the early stages of stroke compared to lesion volume.
• These findings underscore the clinical significance of perfusion imaging in assessing language deficits post-stroke.