Advanced qEEG analyses discriminate between dementia subtypes

Acknowledgement This study is part of the academic postgraduate research of Masha Burelo, financed through the postgraduate fellowship program of the National Council of Science and Technology (CONACYT, by its Spanish acronym) of Mexico.Peer reviewe

Intra-arterial thrombolysis of occluded middle cerebral artery by use of collateral pathways in patients with tandem cervical carotid artery/middle cerebral artery occlusion

BACKGROUND AND PURPOSE: Cervical internal carotid artery (ICA) occlusion with middle cerebral artery (MCA) embolic occlusion is associated with a low rate of recanalization and poor outcome after intravenous thrombolysis. Prompt revascularization is required to prevent disabling stroke. We report our experience on acute ischemic stroke patients with tandem ICA or MCA occlusions treated with microcathether navigation and intra-arterial thrombolysis by use of collateral pathways including the posterior or anterior communicating arteries, or both pathways. MATERIALS AND METHODS: We retrospectively identified 8 patients with proximal ICA occlusion associated with MCA embolic occlusions treated with intra-arterial thrombolysis (IA rtPA). Access to the occluded MCA was obtained via catheter navigation through intact collateral pathways, including posterior communicating (PcomA) or anterior communicating (AcomA) arteries, without passing a microcathether through the acutely occluded ICA. We assessed clinical outcomes using modified Rankin scale (mRS) and National Institutes of Health Stroke Scale (NIHSS). RESULTS: Eight patients with a mean age of 57 ± 4 years and median NIHSS of 14 were identified. Mean time from stroke onset to intra-arterial thrombolysis was 292 ± 44 minutes. The MCA was revascularized completely in 5 of the 8 patients via collateral intra-arterial rtPA administration. All of the patients had a favorable outcome defined as a mRS of ≤2 or more at 1 and 3 months\u27 follow-up after thrombolytic therapy. One patient had an asymptomatic petechial hemorrhage. CONCLUSION: In this small number of patients with tandem occlusions of the ICA and MCA, intraarterial thrombolysis and recanalization of the MCA by use of collateral pathways to bypass the occluded ICA is a safe and efficacious therapeutic option

A framework for studying the effects of offshore wind energy development on birds and bats in the Eastern United States

Offshore wind energy development (OWED), while a key strategy for reducing carbon emissions, has potential negative effects to wildlife that should be examined to inform decision making and adaptive management as the industry expands. We present a conceptual framework to guide the long-term study of potential effects to birds and bats from OWED. This framework includes a focus on exposure and vulnerability as key determinants of risk. For birds and bats that are exposed to OWED, there are three main effects of interest that may impact survival and productivity: 1) collision mortality, 2) behavioral responses, including avoidance, displacement, and attraction, and 3) habitat-mediated effects to prey populations. If these OWED effects cause changes in survival and/or breeding success (e.g., fitness), they have the potential for population-level consequences, including changes in population size and structure. Understanding the influence of ecological drivers on exposure and effect parameters can help to disentangle the potential impacts of OWED from other stressors. We use this theoretical framework to summarize existing relevant knowledge and identify current priority research questions (n=22) for the eastern United States, where large-scale development of OWED is primarily in the planning and early construction phase. We also identify recommendations for study design and further prioritization of research topics

A cultura escolar em conflito: ensino técnico e matemática moderna em Portugal

Disponível em: http://www2.pucpr.br/reol/pb/index.php/dialogo?dd1=16276&dd99=view&dd98=pbO artigo estuda as transformações exigidas às escolas do ensino profissional português durante a reforma da matemática moderna que ocorrem a partir de finais dos anos 1960. Em primeiro lugar, traça um quadro das normas associadas às escolas técnicas portuguesas antes da reforma, recorrendo à legislação fundadora, aos manuais e a artigos de opinião de professores. Em segundo, detalha o debate que antecipou a introdução da reforma recorrendo a artigos e aopiniões expressas durante os cursos preparatórios, onde são notórias as pressões para mudanças na cultura escolar, especialmente nas suas representações, suscitadas pela nova matemática. Finalmente, observar-se como se materializou a reforma nos livros de texto da experiência

Advanced qEEG analyses discriminate between dementia subtypes

Background: Dementia is caused by neurodegenerative conditions and characterizedby cognitive decline. Diagnostic accuracy for dementia subtypes, such as Alzheimer’sDisease (AD), Dementia with Lewy Bodies (DLB) and Parkinson’s Disease withdementia (PDD), remains challenging.Methods: Here, different methods of quantitative electroencephalography (qEEG)analyses were employed to assess their effectiveness in distinguishing dementiasubtypes from healthy controls under eyes closed (EC) and eyes open (EO)conditions.Results: Classic Fast-Fourier Transform (FFT) and autoregressive (AR) poweranalyses differentiated between all conditions for the 4-8 Hz theta range. Onlyindividuals with dementia with Lewy Bodies (DLB) differed from healthy subjects for thewider 4-15 Hz frequency range, encompassing the actual dominant frequency of allindividuals. FFT results for this range yielded wider significant discriminators vs AR,also detecting differences between AD and DLB. Analyses of the inclusive dominant /peak frequency range (4-15 Hz) indicated slowing and reduced variability, alsodiscriminating between synucleinopathies vs controls and AD.Dissociation of periodic oscillations and aperiodic components of AR spectra usingFitting-Oscillations-&-One-Over-F (FOOOF) modelling delivered a reliable andsubtype-specific slowing of brain oscillatory peaks during EC and EO for all groups.Distinct and robust differences were particularly strong for aperiodic parameters,suggesting their potential diagnostic power in detecting specific changes resulting fromage and cognitive status.Conclusion: Our findings indicate that qEEG methods can reliably detect dementiasubtypes. Spectral analyses comprising an integrated, multi-parameter EEG approachdiscriminating between periodic and aperiodic components under EC and EOconditions may enhance diagnostic accuracy in the future

Photoelectric detection of electron spin resonance of nitrogen-vacancy centres in diamond

The readout of negatively charged nitrogen-vacancy centre electron spins is essential for applications in quantum computation, metrology and sensing. Conventional readout protocols are based on the detection of photons emitted from nitrogen-vacancy centres, a process limited by the efficiency of photon collection. We report on an alternative principle for detecting the magnetic resonance of nitrogen-vacancy centres, allowing the direct photoelectric readout of nitrogen-vacancy centres spin state in an all-diamond device. The photocurrent detection of magnetic resonance scheme is based on the detection of charge carriers promoted to the conduction band of diamond by two-photon ionization of nitrogen-vacancy centres. The optical and photoelectric detection of magnetic resonance are compared, by performing both types of measurements simultaneously. The minima detected in the measured photocurrent at resonant microwave frequencies are attributed to the spin-dependent ionization dynamics of nitrogen-vacancy, originating from spin-selective non-radiative transitions to the metastable singlet state

Using focus groups to inform a peer health navigator service for people who are transgender and gender diverse in Saskatchewan, Canada

Abstract Background This study investigated healthcare access and quality for people who are transgender and gender‐diverse (PTGD) in Saskatchewan (SK), Canada, to inform a larger project that was piloting two peer health navigators for PTGD. Methods Two online focus groups were held. Nineteen participants were recruited to represent a broad range in age, gender and location in SK. Transcripts of the focus groups were analyzed using a thematic approach. Results The core theme that was identified was participants' desire for culturally safe healthcare. This core theme had two component themes: (1) systemic healthcare factors and (2) individual healthcare provider (HCP) factors. The healthcare system primarily acted as a barrier to culturally safe healthcare. HCPs could be either barriers or facilitators of culturally safe care; however, negative experiences outweighed positive ones. Conclusions PTGD in SK face discrimination, with delays and barriers to care at all levels of the healthcare system. Peer health navigators can address some of these discrepancies; however, greater support is required for PTGD to be able to access culturally safe healthcare. Patient or Public Contribution People with lived experience/PTGD were involved in all stages of this project. They were included on the team as community researchers and co‐developed the research project, conducted the focus groups, participated in the analyses and are co‐authors. As well, both navigators and all the participants in the focus groups were also PTGD

Study of diamond particles internalization by monitoring cell membrane stiffness changes and their luminescent signal

International audienc