Baseline Conceptual-Semantic Impairment Predicts Longitudinal Treatment Effects for Anomia in Primary Progressive Aphasia and Alzheimer's Disease.
Aaron M Meyer, Sarah F Snider, Donna C Tippett and 4 others
PMID 38283767WHAT IT FOUND
Baseline conceptual-semantic impairment, not diagnosis, predicts anomia treatment success.
Patients with broad conceptual deficits benefited more from lexical treatment, while those with intact conceptual processing benefited more from semantic treatment. This pattern emerged over time, suggesting treatment selection should rely on specific cognitive profiles rather than PPA subtype.
Key findings
01Participants with modality-general conceptual-semantic impairment at baseline showed greater benefit from lexical treatment, whereas those with unimpaired conceptual-semantic processing showed greater benefit from semantic treatment.
02Diagnostic subtype (PPA variant or AD) did not significantly predict the difference in treatment effects between lexical and semantic conditions for nouns.
03Semantic treatment effects for prophylaxis nouns took longer to emerge, becoming significant at 11 months and later, while lexical treatment effects were significant earlier.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
Small sample sizes for some diagnostic subgroups, particularly semantic variant PPA (n=5) and typical AD (n=4). The alternating treatment design carries a risk of cross-condition generalization, where one treatment might affect items assigned to the other condition. Most participants received treatment via telehealth due to the pandemic, which may affect generalizability to in-person clinic settings. The study did not include a no-treatment control group, so natural progression of the disease was not directly compared against treatment effects.
Declared interests
The authors report no conflicts of interest.
The easy way to misread this
Do not assume that semantic treatment is superior for all patients with PPA or AD. The study found that patients with significant conceptual-semantic impairment actually benefited more from lexical treatment, contrary to the intuition that semantic deficits require semantic therapy.