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Thursday, August 4, 2016

Cerebral Microbleeds Create Increased Risks for MS Patients

Aug 3, 2016 | Brain & BehaviorHealth

Leaky blood vessels in the brain become more common with age and are a known risk factor for dementia. They also have been associated with traumatic brain injury, stroke, Alzheimer’s disease and Parkinson’s disease.


Significant Overlap in Risk Factors for MS, Microbleeds

The study, published in the journal Radiology, is among the first to examine what cerebral microbleeds may mean for clinical outcomes in MS.
Researchers decided to study cerebral microbleeds and MS because they saw significant overlap in the risk factors for each condition, according to Robert Zivadinov, MD, PhD, professor of neurology and director of the UB Buffalo Neuroimaging Analysis Center.
“Our hypothesis was that there is increased prevalence of cerebral microbleeds in MS because progression of that disease is associated with increased likelihood of cardiovascular comorbidities, including hypertension, altered lipid metabolism, overweight/obesity, smoking and diabetes and migraine, all risk factors for cerebral microbleeds,“ says Zivadinov, who is also director of Magnetic Resonance Imaging in UB’s Clinical and Translational Research Center.

Seeking New Ways to Prevent Formation of Leaks

The researchers found that the more cerebral microbleeds a patient had, the more severe were their physical and cognitive outcomes. In particular, MS patients who had more cerebral microbleeds had more physical disability after adjusting for age, hypertension and whole-brain volume.
“This is significant because it suggests that cerebral microbleeds are associated with increased physical disability in MS patients, independent from these additional risk factors for cerebral microbleeds,” Zivadinov says.
In assessing cognitive disability, the researchers found that in the subgroup of MS patients who underwent neuropsychological testing, those with more cerebral microbleeds had higher disability on verbal and other cognitive function tests.
“Those MS patients who have cerebral microbleeds are subject to developing more physical and cognitive disabilities earlier in their disease, and therefore monitoring them more closely might be appropriate,” Zivadinov says.
Significant research is now being done on ways to combat cerebral microbleeds, he says, adding that currently, prevention of cardiovascular risk factors was seen as the best way to prevent their formation since there are no currently available target therapies.

Comprehensive Study Included More than 700 Patients

The study included 445 patients with MS; 45 with clinically isolated syndrome, which is the first MS episode a patient experiences; 51 patients with other neurological diseases; and 177 healthy controls.
All study participants underwent a type of magnetic resonance imaging called susceptibility-weighted imaging that is specifically targeted to better image blood products.
“We found that 20 percent of MS patients over the age of 50 have cerebral microbleeds compared to 7 percent of healthy controls,” says Ferdinand Schweser, PhD, assistant professor of neurology and senior author on the paper.
Among subjects under the age of 50, 14 percent of patients with clinically isolated syndrome had microbleeds versus just 3 percent of healthy controls.

Five-Year, Longitudinal Study Being Conducted

The researchers are conducting a five-year, longitudinal study of these patients focused on the relationship between cerebral microbleeds, advances in magnetic resonance imaging and clinical outcomes.
Faculty co-authors in the Department of Neurology are:
Deepa P. Ramasamy, MD; Jesper Hagemeier, PhD; and Niels Bergsland, PhD; are other UB co-authors along with Paul Polak, Nicola Bertolino and Christopher Magnano.
Other authors from Wayne State University include E. Mark Haacke, PhD; and David Utriainen.
The study was supported in part by the Buffalo Neuroimaging Analysis Center and the Jacquemin Family Foundation.

https://scienceblog.com/486730/cerebral-microbleeds-create-increased-risks-ms-patients/

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