| 1. |
- Chetelat, G., et al.
(författare)
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Amyloid-PET and 18-F-FDG-PET in the diagnostic investigation of Alzheimer's disease and other dementias
- 2020
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Ingår i: Lancet Neurology. - 1474-4422 .- 1474-4465. ; 19:11, s. 951-962
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Forskningsöversikt (refereegranskat)abstract
- Various biomarkers are available to support the diagnosis of neurodegenerative diseases in clinical and research settings. Among the molecular imaging biomarkers, amyloid-PET, which assesses brain amyloid deposition, and F-18-fluorodeoxyglucose (F-18-FDG) PET, which assesses glucose metabolism, provide valuable and complementary information. However, uncertainty remains regarding the optimal timepoint, combination, and an order in which these PET biomarkers should be used in diagnostic evaluations because conclusive evidence is missing. Following an expert panel discussion, we reached an agreement on the specific use of the individual biomarkers, based on available evidence and clinical expertise. We propose a diagnostic algorithm with optimal timepoints for these PET biomarkers, also taking into account evidence from other biomarkers, for early and differential diagnosis of neurodegenerative diseases that can lead to dementia. We propose three main diagnostic pathways with distinct biomarker sequences, in which amyloid-PET and F-18-FDG-PET are placed at different positions in the order of diagnostic evaluations, depending on clinical presentation. We hope that this algorithm can support diagnostic decision making in specialist clinical settings with access to these biomarkers and might stimulate further research towards optimal diagnostic strategies.
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| 2. |
- Karikari, Thomas, et al.
(författare)
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Blood phosphorylated tau 181 as a biomarker for Alzheimer's disease: a diagnostic performance and prediction modelling study using data from four prospective cohorts.
- 2020
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Ingår i: The Lancet. Neurology. - 1474-4465 .- 1474-4422. ; 19:5, s. 422-433
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Tidskriftsartikel (refereegranskat)abstract
- CSF and PET biomarkers of amyloid β and tau accurately detect Alzheimer's disease pathology, but the invasiveness, high cost, and poor availability of these detection methods restrict their widespread use as clinical diagnostic tools. CSF tau phosphorylated at threonine 181 (p-tau181) is a highly specific biomarker for Alzheimer's disease pathology. We aimed to assess whether blood p-tau181 could be used as a biomarker for Alzheimer's disease and for prediction of cognitive decline and hippocampal atrophy.We developed and validated an ultrasensitive blood immunoassay for p-tau181. Assay performance was evaluated in four clinic-based prospective cohorts. The discovery cohort comprised patients with Alzheimer's disease and age-matched controls. Two validation cohorts (TRIAD and BioFINDER-2) included cognitively unimpaired older adults (mean age 63-69 years), participants with mild cognitive impairment (MCI), Alzheimer's disease, and frontotemporal dementia. In addition, TRIAD included healthy young adults (mean age 23 years) and BioFINDER-2 included patients with other neurodegenerative disorders. The primary care cohort, which recruited participants in Montreal, Canada, comprised control participants from the community without a diagnosis of a neurological condition and patients referred from primary care physicians of the Canadian National Health Service for specialist care. Concentrations of plasma p-tau181 were compared with established CSF and PET biomarkers and longitudinal measurements using Spearman correlation, area under the curve (AUC), and linear regression analyses.We studied 37 individuals in the discovery cohort, 226 in the first validation cohort (TRIAD), 763 in the second validation cohort (BioFINDER-2), and 105 in the primary care cohort (n=1131 individuals). In all cohorts, plasma p-tau181 showed gradual increases along the Alzheimer's disease continuum, from the lowest concentrations in amyloid β-negative young adults and cognitively unimpaired older adults, through higher concentrations in the amyloid β-positive cognitively unimpaired older adults and MCI groups, to the highest concentrations in the amyloid β-positive MCI and Alzheimer's disease groups (p<0·001, Alzheimer's disease vs all other groups). Plasma p-tau181 distinguished Alzheimer's disease dementia from amyloid β-negative young adults (AUC=99·40%) and cognitively unimpaired older adults (AUC=90·21-98·24% across cohorts), as well as other neurodegenerative disorders, including frontotemporal dementia (AUC=82·76-100% across cohorts), vascular dementia (AUC=92·13%), progressive supranuclear palsy or corticobasal syndrome (AUC=88·47%), and Parkinson's disease or multiple systems atrophy (AUC=81·90%). Plasma p-tau181 was associated with PET-measured cerebral tau (AUC=83·08-93·11% across cohorts) and amyloid β (AUC=76·14-88·09% across cohorts) pathologies, and 1-year cognitive decline (p=0·0015) and hippocampal atrophy (p=0·015). In the primary care cohort, plasma p-tau181 discriminated Alzheimer's disease from young adults (AUC=100%) and cognitively unimpaired older adults (AUC=84·44%), but not from MCI (AUC=55·00%).Blood p-tau181 can predict tau and amyloid β pathologies, differentiate Alzheimer's disease from other neurodegenerative disorders, and identify Alzheimer's disease across the clinical continuum. Blood p-tau181 could be used as a simple, accessible, and scalable test for screening and diagnosis of Alzheimer's disease.Alzheimer Drug Discovery Foundation, European Research Council, Swedish Research Council, Swedish Alzheimer Foundation, Swedish Dementia Foundation, Alzheimer Society Research Program.
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| 3. |
- Fratiglioni, Laura, et al.
(författare)
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Ageing without dementia : can stimulating psychosocial and lifestyle experiences make a difference?
- 2020
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Ingår i: Lancet Neurology. - 1474-4422 .- 1474-4465. ; 19:6, s. 533-543
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Forskningsöversikt (refereegranskat)abstract
- In a world with an ageing population, dementia has become an urgent threat to global health and wellbeing. Psychosocial and lifestyle factors, such as higher socioeconomic positions, longer times spent in education, greater occupational complexity, reduced stress at work, and engagement in mental, physical, and social activities, have been hypothesised to supply resilience against dementia. Although questions remain surrounding the role of these factors in the development of dementia, scientific advancements have considerably expanded our understanding of modifiable psychosocial and lifestyle factors and their neuroprotective and compensatory influences over a life course. Evidence from observational studies is robust enough to suggest that stimulating psychosocial and lifestyle factors are protective against dementia. And, although the corresponding evidence from intervention studies is still scarce, public health campaigns promoting psychosocial and lifestyle factors might improve the health and wellbeing of people aged 60 years and older.
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| 4. |
- Hankey, Graeme, et al.
(författare)
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Safety and efficacy of fluoxetine on functional outcome after acute stroke (AFFINITY) : a randomised, double-blind, placebo-controlled trial.
- 2020
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Ingår i: Lancet Neurology. - 1474-4422 .- 1474-4465. ; 19:8, s. 651-660
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Trials of fluoxetine for recovery after stroke report conflicting results. The Assessment oF FluoxetINe In sTroke recoverY (AFFINITY) trial aimed to show if daily oral fluoxetine for 6 months after stroke improves functional outcome in an ethnically diverse population.METHODS: AFFINITY was a randomised, parallel-group, double-blind, placebo-controlled trial done in 43 hospital stroke units in Australia (n=29), New Zealand (four), and Vietnam (ten). Eligible patients were adults (aged ≥18 years) with a clinical diagnosis of acute stroke in the previous 2-15 days, brain imaging consistent with ischaemic or haemorrhagic stroke, and a persisting neurological deficit that produced a modified Rankin Scale (mRS) score of 1 or more. Patients were randomly assigned 1:1 via a web-based system using a minimisation algorithm to once daily, oral fluoxetine 20 mg capsules or matching placebo for 6 months. Patients, carers, investigators, and outcome assessors were masked to the treatment allocation. The primary outcome was functional status, measured by the mRS, at 6 months. The primary analysis was an ordinal logistic regression of the mRS at 6 months, adjusted for minimisation variables. Primary and safety analyses were done according to the patient's treatment allocation. The trial is registered with the Australian New Zealand Clinical Trials Registry, ACTRN12611000774921.FINDINGS: Between Jan 11, 2013, and June 30, 2019, 1280 patients were recruited in Australia (n=532), New Zealand (n=42), and Vietnam (n=706), of whom 642 were randomly assigned to fluoxetine and 638 were randomly assigned to placebo. Mean duration of trial treatment was 167 days (SD 48·1). At 6 months, mRS data were available in 624 (97%) patients in the fluoxetine group and 632 (99%) in the placebo group. The distribution of mRS categories was similar in the fluoxetine and placebo groups (adjusted common odds ratio 0·94, 95% CI 0·76-1·15; p=0·53). Compared with patients in the placebo group, patients in the fluoxetine group had more falls (20 [3%] vs seven [1%]; p=0·018), bone fractures (19 [3%] vs six [1%]; p=0·014), and epileptic seizures (ten [2%] vs two [<1%]; p=0·038) at 6 months.INTERPRETATION: Oral fluoxetine 20 mg daily for 6 months after acute stroke did not improve functional outcome and increased the risk of falls, bone fractures, and epileptic seizures. These results do not support the use of fluoxetine to improve functional outcome after stroke.FUNDING: National Health and Medical Research Council of Australia.
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| 5. |
- Lauwers, E., et al.
(författare)
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Potential human transmission of amyloid beta pathology: surveillance and risks
- 2020
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Ingår i: Lancet Neurology. - 1474-4422 .- 1474-4465. ; 19:10, s. 872-878
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Tidskriftsartikel (refereegranskat)abstract
- Studies in experimental animals show transmissibility of amyloidogenic proteins associated with prion diseases, Alzheimer's disease, Parkinson's disease, and other neurodegenerative diseases. Although these data raise potential concerns for public health, convincing evidence for human iatrogenic transmission only exists for prions and amyloid beta after systemic injections of contaminated growth hormone extracts or dura mater grafts derived from cadavers. Even though these procedures are now obsolete, some reports raise the possibility of iatrogenic transmission of amyloid beta through putatively contaminated neurosurgical equipment. Iatrogenic transmission of amyloid beta might lead to amyloid deposition in the brain parenchyma and blood vessel walls, potentially resulting in cerebral amyloid angiopathy after several decades. Cerebral amyloid angiopathy can cause life-threatening brain haemorrhages; yet, there is no proof that the transmission of amyloid can also lead to Alzheimer's dementia. Large, long-term epidemiological studies and sensitive, cost-efficient tools to detect amyloid are needed to better understand any potential routes of amyloid beta transmission and to clarify whether other similar proteopathic seeds, such as tau or alpha-synuclein, can also be transferred iatrogenically.
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| 6. |
- Lundström, Erik, 1964-, et al.
(författare)
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Safety and efficacy of fluoxetine on functional recovery after acute stroke (EFFECTS): a randomised, double-blind, placebo-controlled trial.
- 2020
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Ingår i: The Lancet. Neurology. - 1474-4465 .- 1474-4422. ; 19:8, s. 661-669
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Tidskriftsartikel (refereegranskat)abstract
- Studies have suggested that fluoxetine could improve neurological recovery after stroke. The Efficacy oF Fluoxetine-a randomisEd Controlled Trial in Stroke (EFFECTS) trial aimed to assess whether administration of oral fluoxetine for 6 months after acute stroke improves functional outcome.EFFECTS was an investigator-led, multicentre, randomised, placebo-controlled, double-blind, parallel group trial that enrolled patients aged 18 years or older between 2 and 15 days after stroke onset in 35 stroke and rehabilitation centres in Sweden. Eligible patients had a clinical diagnosis of ischaemic or intracerebral haemorrhage, brain imaging that was consistent with intracerebral haemorrhage or ischaemic stroke, and had at least one persisting focal neurological deficit. A web-based randomisation system that incorporated a minimisation algorithm was used to randomly assign (1:1) participants to receive oral fluoxetine 20 mg once daily or matching placebo capsules for 6 months. Patients, care providers, investigators, and outcomes assessors were masked to the allocation. The primary outcome was functional status, measured with the modified Rankin Scale (mRS) at 6 months, analysed in all patients with available mRS data at the 6-month follow-up; we did an ordinal analysis adjusted for the minimisation variables used in the randomisation. This trial is registered with EudraCT, 2011-006130-16; ISRCTN, 13020412; and ClinicalTrials.gov, NCT02683213.Between Oct 20, 2014, and June 28, 2019, 1500 patients were enrolled, of whom 750 were randomly assigned to fluoxetine and 750 were randomly assigned to placebo. At 6 months, mRS data were available for 737 (98%) patients in the fluoxetine group and 742 (99%) patients in the placebo group. There was no effect of fluoxetine on the primary outcome-distribution across mRS score categories-compared with placebo (adjusted common odds ratio 0·94 [95% CI 0·78 to 1·13]; p=0·42). The proportion of patients with a new diagnosis of depression was lower with fluoxetine than with placebo (54 [7%] patients vs 81 [11%] patients; difference -3·60% [-6·49 to -0·71]; p=0·015), but fluoxetine was associated with more bone fractures (28 [4%] vs 11 [2%]; difference 2·27% [0·66 to 3·87]; p=0·0058) and hyponatraemia (11 [1%] vs one [<1%]; difference 1·33% [0·43 to 2·23]; p=0·0038) at 6 months.Functional outcome after acute stroke did not improve with oral fluoxetine 20 mg once daily for 6 months. Fluoxetine reduced the occurrence of depression but increased the risk of bone fractures and hyponatraemia. Our results do not support the use of fluoxetine after acute stroke.The Swedish Research Council, the Swedish Heart-Lung Foundation, the Swedish Brain Foundation, the Swedish Society of Medicine, King Gustav V and Queen Victoria's Foundation of Freemasons, and the Swedish Stroke Association (STROKE-Riksförbundet).
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| 7. |
- Siclari, Francesca, et al.
(författare)
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Dreams and nightmares in healthy adults and in patients with sleep and neurological disorders
- 2020
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Ingår i: Lancet Neurology. - : Elsevier. - 1474-4422 .- 1474-4465. ; 19:10, s. 849-859
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Forskningsöversikt (refereegranskat)abstract
- Dreams are experiences that occur during sleep, while we are disconnected from the environment. Thanks to recent progress in neuroimaging techniques, it is now becoming possible to relate dream features to specific patterns of brain activity. Some conditions occurring in patients with neurological disorders, such as lucid dreams and parasomnias, not only have diagnostic value, but also offer a window into the dream process. They show that dreaming is reflected in physiological signals, behaviours, and brain activity patterns, and that the body can enact dream content. Yet, the dream body can also be distinct from the real body; in their dreams, patients with congenital paraplegia can walk, those with sleep apnoea rarely suffocate, and phantom limb pain can disappear. These conditions provide valuable models for future studies investigating the mechanisms that underlie oneiric experiences.
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| 8. |
- Cronberg, Tobias, et al.
(författare)
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Brain injury after cardiac arrest : from prognostication of comatose patients to rehabilitation
- 2020
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Ingår i: The Lancet Neurology. - 1474-4422. ; 19:7, s. 611-622
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Forskningsöversikt (refereegranskat)abstract
- More patients are surviving cardiac arrest than ever before; however, the burden now lies with estimating neurological prognoses in a large number of patients who were initially comatose, in whom the ultimate outcome is unclear. Neurologists, neurointensivists, and clinical neurophysiologists must accurately balance the concern that overly conservative prognostication could leave patients in a severely disabled state, with the possibility that inaccurately pessimistic prognostication could lead to the withdrawal of life-sustaining treatment in patients who might otherwise have a good functional outcome. Prognostic tools have improved greatly, including electrophysiological tests, neuroimaging, and chemical biomarkers. Conclusions about the prognosis should be delayed at least 72 h after arrest to allow for the clearance of sedative drugs. Cognitive impairments, emotional problems, and fatigue are common among patients who have survived cardiac arrest, and often go unrecognised despite being related to caregiver burden and a decreased participation in society. Through simple screening, these problems can be identified, and patients can be provided with adequate information and rehabilitation.
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| 9. |
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| 10. |
- He, Anna, et al.
(författare)
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Timing of high-efficacy therapy for multiple sclerosis: a retrospective observational cohort study.
- 2020
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Ingår i: The Lancet. Neurology. - 1474-4465. ; 19:4, s. 307-316
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Tidskriftsartikel (refereegranskat)abstract
- High-efficacy therapies in multiple sclerosis are traditionally used after unsuccessful treatment with first-line disease modifying therapies. We hypothesised that early commencement of high-efficacy therapy would be associated with reduced long-term disability. We therefore aimed to compare long-term disability outcomes between patients who started high-efficacy therapies within 2 years of disease onset with those who started 4-6 years after disease onset.In this retrospective international observational study, we obtained data from the MSBase registry and the Swedish MS registry, which prospectively collect patient data that are specific to multiple sclerosis as part of routine clinical care. We identified adult patients (aged ≥18 years) with relapsing-remitting multiple sclerosis, with at least 6 years of follow-up since disease onset, and who started the high-efficacy therapy (rituximab, ocrelizumab, mitoxantrone, alemtuzumab, or natalizumab) either 0-2 years (early) or 4-6 years (late) after clinical disease onset. We matched patients in the early and late groups using propensity scores calculated on the basis of their baseline clinical and demographic data. The primary outcome was disability, measured with the Expanded Disability Status Score (EDSS; an ordinal scale of 0-10, with higher scores indicating increased disability), at 6-10 years after disease onset, assessed with a linear mixed-effects model.We identified 6149 patients in the MSBase registry who had been given high-efficacy therapy, with data collected between Jan 1, 1975, and April 13, 2017, and 2626 patients in the Swedish MS Registry, with data collected between Dec 10, 1997, and Sept 16, 2019. Of whom, 308 in the MSBase registry and 236 in the Swedish MS registry were eligible for inclusion. 277 (51%) of 544 patients commenced therapy early and 267 (49%) commenced therapy late. For the primary analysis, we matched 213 patients in the early treatment group with 253 in the late treatment group. At baseline, the mean EDSS score was 2·2 (SD 1·2) in the early group and 2·1 (SD 1·2) in the late group. Median follow-up time for matched patients was 7·8 years (IQR 6·7-8·9). In the sixth year after disease onset, the mean EDSS score was 2·2 (SD 1·6) in the early group compared with 2·9 (SD 1·8) in the late group (p<0·0001). This difference persisted throughout each year of follow-up until the tenth year after disease onset (mean EDSS score 2·3 [SD 1·8] vs 3·5 [SD 2·1]; p<0·0001), with a difference between groups of -0·98 (95% CI -1·51 to -0·45; p<0·0001, adjusted for proportion of time on any disease-modifying therapy) across the 6-10 year follow-up period.High-efficacy therapy commenced within 2 years of disease onset is associated with less disability after 6-10 years than when commenced later in the disease course. This finding can inform decisions regarding optimal sequence and timing of multiple sclerosis therapy.National Health and Medical Research Council Australia and MS Society UK.
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