Bond AE, Shah BB, Huss DS, et al. Safety and efficacy of focused ultrasound thalamotomy for patients with medication-refractory, tremor-dominant Parkinson disease: a randomized clinical trial. JAMA Neurol. 2017 Oct 30 [Epub ahead of print].
Biomarker of Multiple Sclerosis Identified
MicroRNAs associated with circulating exosomes are informative biomarkers for the diagnosis of multiple sclerosis (MS) and for predicting disease subtype with a high degree of accuracy, according to a study published October 30 in Scientific Reports. Exosome-associated microRNAs in serum samples from 25 patients with MS and 11 matched healthy controls were profiled using small RNA next-generation sequencing. In addition to identifying biomarkers that distinguish healthy people from people with MS, researchers identified nine microRNA molecules that differentiate between relapsing-remitting MS and progressive MS. Study authors also validated eight out of nine microRNA molecules in an independent group of 11 patients with progressive MS. The blood test may enable earlier treatment of MS and help neurologists identify the most appropriate treatment for a patient, said the authors.
Ebrahimkhani S, Vafaee F, Young PE, et al. Exosomal microRNA signatures in multiple sclerosis reflect disease status. Sci Rep. 2017;7(1):14293.
Does Oral Anticoagulation in Atrial Fibrillation Reduce Dementia Risk?
The risk of dementia in patients with atrial fibrillation is higher among those who do not take oral anticoagulants, compared with those who do, according to a study published online ahead of print October 24 in the European Heart Journal. This Swedish retrospective registry study included 444,106 patients with hospital diagnosis of atrial fibrillation and no previous diagnosis of dementia between 2006 and 2014. At baseline, 54% of patients were not taking oral anticoagulants. Investigators performed propensity score matching, used falsification end points, and performed intention-to-treat and on-treatment analyses. Patients on anticoagulant treatment at baseline had a 29% lower risk of dementia than patients without anticoagulant treatment, and a 48% lower risk analyzed on treatment. Direct comparison between new oral anticoagulants and warfarin showed no difference.
Friberg L, Rosenqvist M. Less dementia with oral anticoagulation in atrial fibrillation. Eur Heart J. 2017 Oct 24 [Epub ahead of print].
Dendritic Spine Plasticity May Protect Against Dementia
Dendritic spine plasticity protects older people with Alzheimer’s disease pathology from developing dementia, according to a study published in the October issue of Annals of Neurology. Researchers compared dendritic spines within layer II and III pyramidal neuron dendrites in Brodmann area 46 of the dorsolateral prefrontal cortex in 12 age-matched healthy controls, eight controls with Alzheimer’s disease pathology (CAD), and 21 people with Alzheimer’s disease. The investigators created digital reconstructions of dendritic structure for morphologic analyses. Spine density was similar among control and CAD cases, but was reduced significantly in Alzheimer’s disease. Thin and mushroom spines were reduced significantly in Alzheimer’s disease, compared with CAD brains, and stubby spine density was decreased significantly in CAD and Alzheimer’s disease, compared with controls.
Boros BD, Greathouse KM, Gentry EG, et al. Dendritic spines provide cognitive resilience against Alzheimer’s disease. Ann Neurol. 2017;82(4):602-614.
Opioid Versus Nonopioid Treatment for Acute Migraine
IV hydromorphone is substantially less effective than IV prochlorperazine for the treatment of acute migraine in the emergency department and should not be used as first-line therapy, according to a study published online ahead of print October 18 in Neurology. This study was conducted in two emergency departments and included patients who met international criteria for migraine if they had not used an opioid within the previous month. Participants received hydromorphone (1 mg) or prochlorperazine (10 mg) and diphenhydramine (25 mg). The primary outcome was achieving a headache level of mild or none within two hours of treatment and maintaining that level for 48 hours without rescue medication. Approximately 60% of the prochlorperazine arm achieved the primary outcome, compared with 31% of the hydromorphone arm.
Friedman BW, Irizarry E, Solorzano C, et al. Randomized study of IV prochlorperazine plus diphenhydramine vs IV hydromorphone for migraine. Neurology. 2017 Oct 18 [Epub ahead of print].
Frontotemporal Degeneration Entails High Economic Burden
The economic burden of frontotemporal degeneration may be twice as high as that of Alzheimer’s disease, according to a study published online ahead of print October 4 in Neurology. An Internet survey was administered to 674 primary caregivers of patients with behavioral-variant frontotemporal degeneration, primary progressive aphasia, frontotemporal degeneration with motor neuron disease, corticobasal syndrome, or progressive supranuclear palsy. Direct costs for these disorders equaled $47,916, and indirect costs equaled $71,737. Patients age 65 or older, those with later stages of disease, and those with behavioral-variant frontotemporal degeneration had higher direct costs, while patients younger than 65 and men had higher indirect costs. Mean household income ranged from $75,000 to $99,000 at 12 months before frontotemporal degeneration diagnosis, but declined to $50,000 to $59,999 after diagnosis.