Dementia trajectory for patients with logopenic variant primary progressive aphasia

Area of Science:

• Neurology
• Neuroscience
• Dementia Research

Background:

• The progression rate of logopenic variant primary progressive aphasia (lvPPA) to severe dementia remains unclear.
• Understanding this progression is crucial for patient management and therapeutic development.

Purpose of the Study:

• To elucidate the timing and characteristics of disease progression in patients with lvPPA.
• To identify key clinical milestones and cognitive deficits associated with lvPPA advancement.

Main Methods:

• Longitudinal follow-up of 10 patients diagnosed with lvPPA.
• Annual assessment of Clinical Dementia Rating (CDR) sum of boxes and onset of specific cognitive and behavioral signs.
• Evaluation of benchmark signs including dementia severity, memory deficits, and visuospatial/apraxic impairments.

Main Results:

• Patients reached CDR 1, 2, and 3 at an average of 4.1, 5.7, and 7.3 years post-onset, respectively.
• The annual rate of CDR sum of boxes increase was 3.4, indicating a rapid decline.
• Onset of difficulties with electronic controls, episodic memory deficits, topographical disorientation, and conceptual apraxia occurred between 3.3 and 5.5 years post-onset.

Conclusions:

• Patients with lvPPA experience rapid progression to dementia.
• Key deficits include conceptual apraxia, episodic memory impairments, visuospatial deficits, and semantic memory deficits.
• The study highlights the aggressive nature of lvPPA and the emergence of specific cognitive and behavioral symptoms during progression.