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Respiratory control in presenile dementia
S S Derderian1, K R Rajagopal, B Jabbari
1Department of Clinical Investigation, Walter Reed Army Medical Center, Washington, D.C. 20307-5001.
The American Review of Respiratory Disease
|January 1, 1988
Summary
Patients with presenile dementia show impaired respiratory responses to inspiratory load. The cerebral cortex appears crucial for maintaining ventilation when facing breathing challenges.
Area of Science:
- Neuroscience
- Respiratory Physiology
- Neurology
Background:
- The cerebral cortex plays a role in complex motor control.
- Understanding respiratory control mechanisms is vital for neurological conditions.
- Presenile dementia, like Alzheimer's disease, involves cortical degeneration.
Purpose of the Study:
- To investigate the cerebral cortex's role in respiratory compensation to inspiratory loads.
- To assess respiratory control in patients with presenile dementia (Alzheimer's type).
Main Methods:
- Studied 7 patients with presenile dementia and 7 healthy controls.
- Utilized rebreathing technique to measure ventilation (VE) and occlusion pressure (P100) responses to hypercapnia.
- Applied an inspiratory flow-resistive load (18 cm H2O.L-1.s) during rebreathing.
Main Results:
- In dementia patients, the VE/PCO2 response slope decreased significantly with added load.
- The P100/PCO2 response slope did not change significantly in patients with added load.
- Healthy controls showed an increased P100/PCO2 response slope with load, maintaining ventilation.
Conclusions:
- Presenile dementia patients exhibit inadequate neuromuscular output during inspiratory loading.
- The cerebral cortex is implicated in load compensation for respiratory control.
- Impaired load compensation in dementia suggests a breakdown in cortical respiratory processing.