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High prevalence of neurovascular instability in neurodegenerative dementias
1Medical Research Council, Neurochemical Pathology Unit, Newcastle General Hospital, Newcastle upon Tyne, UK.
Insights
Cardioinhibitory carotid sinus hypersensitivity (CI) was more common in dementia with Lewy bodies (DLB) patients than Alzheimer's disease (AD) patients. Further research is needed to understand CI's implications for DLB treatment and mechanisms.
Area of Science:
- Neurology
- Cardiology
- Gerontology
Background:
- Orthostatic hypotension and carotid sinus hypersensitivity (CSH) are common in neurodegenerative diseases.
- Dementia with Lewy bodies (DLB) and Alzheimer's disease (AD) are distinct neurodegenerative conditions with overlapping symptoms.
Purpose of the Study:
- To compare the prevalence of orthostatic hypotension and CSH in patients with DLB and AD.
- To investigate potential differences in CSH subtypes between DLB and AD.
Main Methods:
- Patients meeting clinical criteria for DLB (n=30) and AD (n=35) underwent assessment for orthostatic hypotension and CSH.
- CSH was categorized into different types, including cardioinhibitory (CI) CSH.
Main Results:
- Cardioinhibitory CSH was the most frequent sign observed in both groups.
- The prevalence of CI-CSH was higher in DLB patients (41%) compared to AD patients (28%).
- Preliminary analysis suggested CI-CSH may be significantly more prevalent in DLB when excluding patients with hypertension or ischemic heart disease.
Conclusions:
- Cardioinhibitory CSH appears to be more common in dementia with Lewy bodies than in Alzheimer's disease.
- Larger studies are required to confirm these findings and explore the clinical implications for DLB management.
- Further research is needed to elucidate the underlying pathophysiological mechanisms driving these differences.
Abstract:
Orthostatic hypotension and carotid sinus hypersensitivity were assessed in patients meeting clinical criteria for dementia with Lewy bodies (DLB; n=30) and AD (n=35). Cardioinhibitory carotid sinus hypersensitivity (CI) was the most common sign (AD patients, 28%; DLB patients, 41%). Preliminary data from a secondary analysis excluding patients with hypertension or EKG evidence of ischemia suggested that CI may be significantly more common in DLB. Larger studies are needed to evaluate the implications for treatment and to explore the underlying mechanisms.