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Is central nervous system processing altered in patients with heart failure?
Stuart D Rosen1, Kevin Murphy, Alexander P Leff
1Department of Respiratory Physiology, National Heart and Lung Institute, Imperial College, Charing Cross Hospital, London W68RP, UK. stuart.rosen@imperial.ac.uk
European Heart Journal
|June 3, 2004
Summary
Heart failure patients show distinct brain activity patterns during exercise-induced breathlessness, unlike healthy individuals. These central neural differences may explain symptom variability and autonomic issues in heart failure.
Area of Science:
- Neuroscience
- Cardiology
- Physiology
Background:
- Breathlessness is a common symptom in heart failure, often linked to breathing regulation issues.
- Abnormal autonomic responses are known in heart failure, but central nervous system (CNS) activity remains under-investigated.
Purpose of the Study:
- To investigate if heart failure patients exhibit different regional brain activation patterns compared to controls after exercise stress.
Main Methods:
- Positron emission tomography (PET) with H2(15)O was used to measure regional cerebral blood flow (rCBF) and global cerebral blood flow (gCBF).
- Measurements were taken in 6 heart failure patients and 6 healthy controls at rest, after exercise, and during isocapnic hyperventilation.
Main Results:
- Heart failure patients and controls had comparable breathlessness and respiratory parameters post-exercise.
- Controls showed activation in the right frontal medial gyrus and left precentral gyrus during exercise vs. hyperventilation, which was absent in patients.
- Both groups exhibited increased rCBF in the anterior cingulate and dorsal cingulate cortex.
Conclusions:
- Heart failure patients display a unique pattern of regional cortical activity related to exercise-induced breathlessness.
- Unlike controls, heart failure patients showed no change in global cerebral blood flow across different conditions.
- These CNS differences may contribute to symptom variability and autonomic dysregulation observed in heart failure.