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Cognitive functioning in orthostatic hypotension due to pure autonomic failure
Hannah C Heims1, Hugo D Critchley, Naomi H Martin
1Dept. of Neuropsychology, BOX 37, National Hospital for Neurology and Neurosurgery, Queen Square, London,WC1N 3BG, UK.
Summary
Pure Autonomic Failure (PAF) can impact cognitive functions, particularly speed, attention, and executive functions. This pilot study explored cognitive deficits in 14 PAF patients, suggesting potential links to cerebral underperfusion.
Area of Science:
- Neuroscience
- Psychophysiology
- Cognitive Science
Background:
- Psychophysiology suggests a link between cognitive processes and autonomic responses.
- The impact of autonomic failure on cognition remains largely undocumented.
- Pure Autonomic Failure (PAF) presents a unique model to study this relationship.
Purpose of the Study:
- To investigate the cognitive profile of patients with Pure Autonomic Failure (PAF).
- To identify specific cognitive deficits associated with autonomic dysfunction.
- To explore potential underlying mechanisms for observed cognitive changes.
Main Methods:
- Pilot study involving 14 patients diagnosed with Pure Autonomic Failure (PAF).
- Comprehensive neuropsychological testing battery administered to all participants.
- Neuroimaging investigations conducted to assess brain structure.
Main Results:
- Six out of 14 (43%) PAF patients exhibited cognitive impairment.
- The most common deficits observed were in processing speed, attention, and executive functions.
- Memory, intellectual, and calculation functions were less frequently impaired; not always correlated with white matter abnormalities.
Conclusions:
- Cognitive impairments, especially in speed, attention, and executive functions, are present in some PAF patients.
- Potential causes include systemic hypotension leading to cerebral underperfusion.
- Dysregulation of integrated bodily arousal responses may also contribute to cognitive deficits in PAF.