Progressive apraxia of speech: delays to diagnosis and rates of alternative diagnoses.

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Progressive apraxia of speech (PAOS) is a neurodegenerative disorder of speech programming distinct from aphasia and dysarthria, most commonly associated with a 4-repeat tauopathy. Our objective was to better understand the reasons for possible delays or diagnostic errors for patients with PAOS.Seventy-seven consecutive PAOS research participants from the Neurodegenerative Research Group were included in this study. The medical records for these patients were reviewed in detail. For each speech-related visit, data such as the chief complaint, clinical findings, and neuroimaging findings were recorded.Apraxia of speech was the initial diagnosis in 20.1% of participants at first evaluation noted in the historical record. Other common diagnoses included primary progressive aphasia (PPA) (20.1%), dysarthria (18.18%), MCI/Dementia (6.5%), and motor neuron disease (3.9%). It took a median of 2.02 (range: 0.16-8.18) years from symptoms onset for participants to receive an initial diagnosis and 3.00 (range: 0.49-9.42) years to receive a correct diagnosis. Those who were seen by a speech-language pathologist (SLP) during their first documented encounter were more likely to be correctly diagnosed with PAOS (37/48) after SLP consultation than those who were not seen by an SLP on initial encounter (5/29) (p 


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Authors: Johnny Dang, Jonathan Graff-Radford, Joseph R Duffy, Rene L Utianski, Heather M Clark, Julie A Stierwalt, Jennifer L Whitwell, Keith A Josephs, Hugo Botha

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