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Relation between MR abnormalities and patterns of cognitive impairment in multiple sclerosis
M Rovaris1, M Filippi, M Falautano
1Department of Neurology, MS Biosignal Analysis Center, Scientific Institute Ospedale San Raffaele, University of Milan, Italy.
Objective:
This study correlated the extent of abnormalities detected by different magnetic resonance imaging (MRI) techniques [proton density (PD)-weighted, T1-weighted, and magnetization transfer imaging (MTI)] with the overall cognitive, frontal lobe, and memory impairments in patients with MS.
Patients:
There were 30 clinically definite MS patients, with different disease courses.
Exclusion Criteria:
psychoactive/steroid treatments, mood disorders, acute relapse phase.
Main Outcome Measures:
Neuropsychological test results. Total (TLL) and frontal (FLL) lesion loads assessed from PD-weighted, T1-weighted (22 patients), and MTI (22 patients) MRI scans. Average lesion MT ratios (MTR) and analysis of the MTR histograms from brain tissue axial slabs on MTI scans.
Results:
Patients with frontal lobe deficits (n=15) or memory impairment (n-17) had a higher TLL on PD scans (p=0.04 and p=0.01, respectively). Patients with frontal lobe deficits had higher FLL on PD scans (p=0.01) and TLL on MTI (p=0.03) scans. No significant relationships between the extent of T1-weighted lesion loads and the presence of any neuropsychological impairment. Mean MTR of both MS lesions and whole brain tissue was lower in patients with frontal lobe impairment (p=0.04). MRI lesion loads correlated significantly with some neuropsychological test scores.
Conclusions:
Lesion loads on PD-weighted MRI and MTI-derived measures are associated with cognitive decline in MS patients. Overall macroscopic and microscopic brain damage is more important than the corresponding regional brain disease in determining deficits of selective cognitive domains.
Insights
Magnetic resonance imaging (MRI) lesion loads on proton density (PD)-weighted and magnetization transfer imaging (MTI) scans correlate with cognitive decline in multiple sclerosis (MS) patients. Macroscopic and microscopic brain damage are key factors in MS-related cognitive deficits.
Area of Science:
- Neuroimaging
- Neurology
- Cognitive Science
Background:
- Multiple Sclerosis (MS) is a demyelinating disease affecting the central nervous system.
- Cognitive impairment is a common and disabling symptom in MS patients.
- Different MRI techniques may offer varying sensitivity in detecting brain abnormalities related to cognitive decline.
Purpose of the Study:
- To correlate the extent of MRI-detected abnormalities using proton density (PD)-weighted, T1-weighted, and magnetization transfer imaging (MTI) with cognitive, frontal lobe, and memory impairments in MS patients.
- To investigate the relationship between lesion load and specific cognitive deficits in MS.
- To assess the utility of MTI-derived measures in understanding MS-related cognitive dysfunction.
Main Methods:
- 30 clinically definite MS patients were assessed, excluding those with psychoactive/steroid treatments, mood disorders, or in the acute relapse phase.
- Neuropsychological tests were administered to evaluate cognitive function.
- Total (TLL) and frontal (FLL) lesion loads were quantified from PD-weighted, T1-weighted, and MTI MRI scans.
- Mean lesion MT ratios (MTR) and MTR histograms were analyzed from MTI scans.
Main Results:
- Higher TLL on PD scans correlated with frontal lobe deficits and memory impairment.
- Higher FLL on PD scans and TLL on MTI scans were associated with frontal lobe deficits.
- No significant correlation was found between T1-weighted lesion loads and neuropsychological impairments.
- Lower mean MTR in MS lesions and whole brain tissue was observed in patients with frontal lobe impairment.
- MRI lesion loads showed significant correlations with some neuropsychological test scores.
Conclusions:
- Lesion loads on PD-weighted MRI and MTI-derived measures are linked to cognitive decline in MS.
- Both overall macroscopic and microscopic brain damage are significant determinants of selective cognitive domain deficits in MS patients.
- MTI may provide valuable insights into the microscopic brain changes underlying cognitive impairment in MS.