Recovery from aphasia in the first year after stroke.

Area of Science:

• Neuroscience
• Neurology
• Speech and Language Pathology

Background:

• Aphasia frequently follows stroke, impacting speech and language.
• Recovery patterns and influencing factors, like lesion characteristics, are not fully understood.
• Understanding stroke-induced aphasia recovery is crucial for clinical prognostication.

Purpose of the Study:

• To comprehensively describe aphasia recovery patterns in the first year post-stroke.
• To investigate the influence of lesion location and extent on recovery trajectories.
• To identify predictors of persistent aphasia deficits.

Main Methods:

• Recruited 334 patients with acute left hemisphere stroke.
• Assessed speech and language using the Quick Aphasia Battery (QAB) within 5 days, and longitudinally at 1, 3 months, and 1 year.
• Manually delineated lesions from acute MRI/CT scans and grouped patients by lesion patterns.

Main Results:

• Aphasia is dynamic, multidimensional, and gradated, not explained by subtypes or fluency.
• Good recovery was observed in patients with circumscribed frontal lesions, and surprisingly, also in many with larger frontal or circumscribed temporal/parietal lesions.
• Persistent deficits were most common in patients with extensive middle cerebral artery or temporoparietal damage.

Conclusions:

• Lesion location and extent significantly influence aphasia recovery dynamics.
• Recovery rates and outcomes vary across different speech and language domains.
• Findings enable clinicians to better predict individual patient recovery trajectories post-stroke.