What is the clinical evidence from this study?

Study design: Observational. Population: Chronic aphasia post-stroke (n=95). Intervention: White matter hyperintensity (WMH) severity. Primary outcome: Therapy-related naming improvements (r = -0.226, p=0.044).

What does this research mean for the field?

White matter hyperintensity severity in the contralateral right hemisphere, particularly periventricular load, is negatively associated with therapy-related naming improvements and aphasia severity in chronic poststroke patients. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Determine whether evaluating white matter hyperintensities in the unaffected contralateral hemisphere provides a more reliable marker of brain health, chronic aphasia severity, and treatment response than whole-brain ratings.

April 25, 2025StrokeOpen Access

White Matter Hyperintensity Load Independent From the Stroke Lesion Is Associated With Chronic Aphasia Severity and Treatment Outcome

Q: What are the key findings of this study?

Right-hemisphere periventricular white matter hyperintensity severity was significantly associated with therapy-related naming improvements (r = -0.226, P = 0.044).

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Key result

Greater right-hemisphere periventricular WMH burden is linked to poorer therapy-related naming improvements.

r = -0.226
P=0.044
n=95

Why the study?

Does right-hemisphere white matter hyperintensity load better predict aphasia severity and treatment outcomes compared to whole-brain ratings in patients with chronic poststroke aphasia?

Key Points

Determine whether evaluating white matter hyperintensities in the unaffected contralateral hemisphere provides a more reliable marker of brain health, chronic aphasia severity, and treatment response than whole-brain ratings.
Enrolled 95 individuals with chronic aphasia (≥12 months post-left-hemisphere stroke) who completed baseline assessments with the Western Aphasia Battery and Philadelphia Naming Test.
Administered 6 weeks of phonological and semantic naming treatments, repeating the Philadelphia Naming Test immediately after intervention.
Rated white matter hyperintensity severity via the Fazekas scale across the whole brain and the right hemisphere alone, controlling for age, lesion volume, time post-stroke, education, and sex.
Whole-brain Fazekas ratings were significantly higher than right-hemisphere ratings (mean 3.337 vs. 2.899; P < 0.001), indicating lesion-related gliosis artificially inflates whole-brain scores.
Baseline language scores negatively correlated with nearly all white matter hyperintensity metrics, with right-hemisphere ratings displaying stronger correlations with behavioral performance.
Right-hemisphere periventricular white matter hyperintensity was uniquely associated with therapy-induced naming improvement (r = -0.226, R² = 0.05, P = 0.044).

Study Design

Type

Observational (n=95)

Structured PICO

Does right-hemisphere white matter hyperintensity load better predict aphasia severity and treatment outcomes compared to whole-brain ratings in patients with chronic poststroke aphasia?

Population

95 participants with chronic aphasia at least 12 months post-left-hemisphere stroke who underwent 6 weeks of naming treatments.

Exposure

6 weeks of phonological and semantic naming treatments focused on improving lexical processing

Outcome

Correlation between white matter hyperintensity (WMH) severity (whole brain vs right hemisphere) and aphasia severity/naming improvementssurrogate

Main Result

Effect estimate: r = -0.226

p-value: p=0.044

Discussion

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Implication

Measuring white matter hyperintensity in the contralateral (right) hemisphere provides a more accurate estimation of brain health and prediction of therapy-related neuroplasticity in chronic poststroke aphasia.

Cite This Study

Busby et al. (2025) conducted an observational in Chronic aphasia post-stroke (n=95). White matter hyperintensity (WMH) severity was evaluated on Therapy-related naming improvements (r = -0.226, p=0.044). Right-hemisphere periventricular white matter hyperintensity severity was significantly associated with therapy-related naming improvements (r = -0.226, P = 0.044).

synapsesocial.com/papers/6a7d8f3be5d85d18548c907b https://doi.org/10.1161/strokeaha.124.046710

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White Matter Hyperintensity Load Independent From the Stroke Lesion Is Associated With Chronic Aphasia Severity and Treatment Outcome

Key Points

Study Design

Structured PICO

Main Result

Discussion

Implication

Cite This Study

White Matter Hyperintensity Load Independent From the Stroke Lesion Is Associated With Chronic Aphasia Severity and Treatment Outcome

Key Points

Study Design

Structured PICO

Main Result

Discussion

Implication

Cite This Study

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