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1.
J Affect Disord ; 2024 Jul 17.
Artigo em Inglês | MEDLINE | ID: mdl-39029690

RESUMO

BACKGROUND: Depression is a common mental disorder and is associated with work disability. For the implementation of evidence-based interventions, such as Individual Placement and Support (IPS) for people with depression in Germany, the aim of this study was to investigate client variables that predict return to work. METHODS: The sample consisted of 129 participants, initially treated in a psychiatric hospital due to major depression, who participated in IPS as part of a German clinical trial. Baseline demographic (age, sex, education, sickness absence days, employment status), psychiatric (symptom severity, comorbidity, general physical and mental health, disability), and neuropsychological (self-rated deficits, test performance) variables were included. Return to work within one year was predicted using separate and overall binary logistic regression analyses. RESULTS: A total of 70 participants (56 %) returned to work within the one-year follow-up period. >100 days of sick leave in the year prior to study entry (vs. <100 days) and higher self-rated cognitive deficits were significantly associated with reduced odds of return to work within one year of IPS. LIMITATIONS: The sample consisted of participants with a relatively good work history who were assigned to IPS by the treatment team, thus, the generalizability of the results is limited. CONCLUSIONS: People with depression who participate in IPS interventions might benefit from specifically targeting perceived cognitive deficits. Factors associated with prolonged sick leave due to depression and their role in return to work with IPS need further investigation.

2.
Acta Ophthalmol ; 102(3): e314-e321, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-37725047

RESUMO

PURPOSE: The German Retina.net ROP registry and its Europe-wide successor, the EU-ROP registry, collect data from patients treated for ROP. This analysis compares input parameters of these two registries to establish a procedure for joint analyses of different registry data using exemplary datasets from the two registries. METHODS: Exemplary datasets from the two databases over a 1-year period each (German Retina.net ROP Registry, 2011, 22 infants; EU-ROP Registry, 2021, 44 infants) were compared. The parameters documented in the two databases were aligned and analysed regarding demographic parameters, treatment modalities, complications within first 24 h and retreatments. RESULTS: The current analysis showed that data can be aligned for joint analyses with some adjustments within the data structure. The registry with more detailed data collection (EU-ROP) needs to be reduced regarding granularity in order to align the different registries, as the registry with lower granularity determines the level of analyses that can be performed in a comparative approach. In the exemplary datasets, we observed that the overall most common ROP severity in both registries was zone II, 3+ (2011: 70.5%; 2021: 65%), with decreasing numbers of clock hours showing preretinal neovascularisations (2011: 10-12 clock hours in 29% of cases, 2021: 4-6 clock hours in 38%). The most prevalent treatment method was laser coagulation in 2011 (75%) and anti-VEGF therapy in 2021 (86.1%). Within the anti-VEGF group, all patients were treated with bevacizumab in 2011 and with ranibizumab in 2021. Retreatment rates were comparable in 2011 and 2021. CONCLUSION: Data from two different ROP registries can be aligned and jointly analysed. The analysis reveals a paradigm shift in treatment modalities, from predominantly laser to anti-VEGF, and within the anti-VEGF group from bevacizumab to ranibizumab in Germany. In addition, there was a trend towards earlier treatment in 2021.


Assuntos
Ranibizumab , Retinopatia da Prematuridade , Recém-Nascido , Lactente , Humanos , Bevacizumab/uso terapêutico , Inibidores da Angiogênese/uso terapêutico , Fator A de Crescimento do Endotélio Vascular , Retinopatia da Prematuridade/terapia , Injeções Intravítreas , Retina , Fotocoagulação a Laser/métodos , Sistema de Registros , Idade Gestacional
3.
Psychiatr Prax ; 2023 Nov 21.
Artigo em Alemão | MEDLINE | ID: mdl-37989201

RESUMO

OBJECTIVES: Due to insufficient empirical data on the occupational participation of people affected by severe mental illness receiving integration assistance, routine data from a community psychiatry service were evaluated. METHODS: Reference workers filled out a short questionnaire on different occupational and employment aspects of their clients from supported housing/floating outreach. In addition to descriptive and exploratory analyses, overall results from previous survey rounds were also evaluated. RESULTS: N=1418 individuals (M=47.6 years) could be included, of whom approximately 45% had no job, sheltered employment, or daytime service. This percentage has remained almost unchanged over the last decades. CONCLUSION: Overall, there is an urgent need for action to improve occupational participation opportunities for people with mental illness and substance addiction.

4.
Appl Neuropsychol Adult ; : 1-5, 2023 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-37708858

RESUMO

BACKGROUND: People with major depressive disorder (MDD) often experience significant memory problems in their daily lives, which, however, frequently do not correspond to standardized memory test (SMT) results. The present pilot study aimed to examine the everyday memory performance of people with MDD by means of an ecological assessment paradigm (EAP). METHODS: Participants were unexpectedly called one week after their neuropsychological test assessment and asked about their memories of specific details of the former test situation. Associations of this EAP with SMT, subjective everyday memory problems, and symptom coping were exploratively analyzed. RESULTS: The study involved 22 MDD inpatients (M = 42.5 years, 64% female) and 22 comparable healthy control persons. MDD patients showed a significantly reduced performance in the EAP as well as in the SMT and they reported more memory problems in their daily lives. However, the EAP was not related to SMT results assessed a week before. Moreover, only the EAP was significantly associated with subjective daily memory problems and (distraction) coping style in the MDD group. CONCLUSIONS: The EAP appears to better reflect the everyday memory problems of persons with depression than standardized test procedures. However, the findings need to be validated by further research with larger samples.

5.
Front Psychiatry ; 13: 942161, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36440409

RESUMO

Background: Major depression is one of the leading causes of disability and limited capacity to work. Neuropsychological impairment is a common symptom in acute and remitted major depression and is associated with poor psychosocial functioning. This scoping review aimed to identify research on the role of neuropsychological functioning in outcomes of vocational rehabilitation programs in individuals with depression. Methods: We report on the conduct of this pre-registered (https://osf.io/5yrnf) scoping review in accordance with PRISMA-ScR guidelines. PubMed and PsychInfo were systematically searched for English or German research articles published between 1990 and September 2021 that studied objective neuropsychological tests as predictors of vocational rehabilitation interventions and included participants with depression. Results: The systematic literature search yielded no studies that specifically targeted subjects with major depression. However, eight articles published since 2016 were included in the review, analyzing data from five trials that evaluated the effectiveness of supported employment in North America and Europe in severe mental illnesses. An estimated 31% of the total number of participants included (n = 3,533) had major depression. Using a variety of cognitive tests and covariates, seven articles found that neuropsychological functioning - especially global cognition scores, verbal and visual learning and memory - significantly predicted vocational outcomes of rehabilitation programs. Conclusion: Despite a lack of studies specifically targeting major depressive disorder, the identified literature suggests that higher baseline neuropsychological functioning predicts better vocational outcomes of supported employment programs in individuals with depression. In clinical practice, additional neuropsychological modules during return-to-work interventions might be helpful for vocational outcomes of such programs.

6.
PLoS One ; 17(7): e0271803, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35905081

RESUMO

The majority of mental illnesses begins in childhood, adolescence and young adulthood before the age of 25. The transition from adolescence to adulthood is a particularly vulnerable time for adolescents with mental illness, affecting psychosocial functioning and participation in work life. Therefore, they need-in contrast to classic standard vocational interventions-a long-term, holistic and individually oriented vocational rehabilitation program. With the innovative model project "Start in education and employment (StAB)", adolescents and young adults with mental illnesses are to be supported with regard to their vocational perspectives and participation by a new type of individualized, holistic, long-term job coaching. It follows the Individual Placement and Support (IPS) concept, as a manualized form of the Supported Employment Approach and is based on the "first place-then train" principle. In order to evaluate the effectiveness and feasibility of the StAB program, a double-centre prospective single arm evaluation study in a mixed-methods design will be conducted. The focus is on quantitative research analysing pre-post-effects of the StAB intervention in a two-year observational study. Young people between 15 and 25 years with a psychiatric diagnosis who are currently in receipt of means-tested benefits or are entitled to them will be recruited. The study will take place in two major cities in the north-western part of Germany, Bielefeld and Dortmund. We expect to contribute to gain more empirical data about the implementation of Supported Employment and Education to severely mentally ill adolescents and young adults in German settings. Moreover, these results may also provide the scientific foundation for future measures focusing the improvement of vocational rehabilitation for young people with mental illness. The study was registered in the German Clinical Trials Register (DRKS00027576) on March 10, 2022.


Assuntos
Readaptação ao Emprego , Transtornos Mentais , Reabilitação Vocacional , Adolescente , Alemanha/epidemiologia , Humanos , Transtornos Mentais/epidemiologia , Avaliação de Programas e Projetos de Saúde , Estudos Prospectivos , Adulto Jovem
7.
Front Psychiatry ; 13: 834389, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35185660

RESUMO

BACKGROUND: Longitudinal observational studies play on an important role for evidence-based research on health services and psychiatric rehabilitation. However, information is missing about the reasons, why patients participate in such studies, and how they evaluate their participation experience. METHODS: Subsequently to their final assessment in a 2-year follow-up study on supported housing for persons with severe mental illness, n = 182 patients answered a short questionnaire on their study participation experience (prior experiences, participation reasons, burden due to study assessments, intention to participate in studies again). Basic respondent characteristics as well as symptom severity (SCL-K9) were also included in the descriptive and analytical statistics. RESULTS: To help other people and curiosity were cited as the main initial reasons for study participation (>85%). Further motives were significantly associated with demographic and/or clinical variables. For instance, "relieve from boredom" was more frequently reported by men and patients with substance use disorders (compared to mood disorders), and participants 'motive" to talk about illness" was associated with higher symptom severity at study entry. Furthermore, only a small proportion of respondents indicated significant burdens by study participation and about 87% would also participate in future studies. CONCLUSIONS: The respondents gave an overall positive evaluation regarding their participation experience in an observational study on psychiatric rehabilitation. The results additionally suggest that health and social care professionals should be responsive to the expectations and needs of patients with mental illness regarding participation in research.

8.
Soc Psychiatry Psychiatr Epidemiol ; 57(5): 927-937, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35041013

RESUMO

PURPOSE: Up to now there are only few studies and no RCT comparing efficacy or effectiveness of supported housing (SH) versus residential care (RC) in severe mental illness (SMI) without homelessness. Here we present an observational follow-up study in SMI subjects, who entered SH or RC, to compare clinical and functional outcomes 2 years later. METHODS: In this prospective study in more than 30 locations throughout a German federal state, we included SMI subjects, who entered SH (n = 153) or RC (n = 104). About one quarter suffered from each substance use, psychotic, affective, or other disorders. To avoid sampling bias, we used the propensity score matching method to establish a quasi-experimental design. Outcome measures were social functioning (SFS), the number of psychiatric hospitalisations, psychopathology (SCL-9-K), and quality of life (MANSA). Apart from descriptive methods we analysed primarily using repeated-measures ANOVAS. RESULTS: Our analyses revealed significant effects of time for all outcomes in both study groups. However, there were not any group differences of outcome measures, i.e., not any significant effects of group or interactional effects of group x time. Moreover, these results hold true for intent-to-treat and per-protocol sample analyses. CONCLUSION: The results show, that SH and RC for non-homeless people with SMI achieve the same clinical and psychosocial outcomes across a 2-year period. Taking into account the users' preferences, the present findings should give reason to ensure the availability of affordable housing and to support the expansion of supported housing approaches.


Assuntos
Habitação , Transtornos Mentais , Seguimentos , Humanos , Transtornos Mentais/psicologia , Transtornos Mentais/terapia , Estudos Prospectivos , Qualidade de Vida
9.
Psychiatr Prax ; 49(3): 152-155, 2022 Apr.
Artigo em Alemão | MEDLINE | ID: mdl-34674200

RESUMO

OBJECTIVE: Exploratory study of corona-related impacts on vocational perspectives of people with mental illness. METHODS: Short survey with quantitative and qualitative questions among employees from vocational rehabilitation. RESULTS: More than 90 % of the n = 76 participants stated that the situation regarding vocational reintegration or job search had worsened due to corona. Moreover, 75 % considered that there would still be a negative impact on vocational rehabilitation in the longer term. In addition to the main problem of a lack of job offers, open responses on obstacles also referred to increased psychological stress among clients as well as problems in reaching cooperation partners or in dealing with online processes. CONCLUSIONS: Under Corona conditions, the work-related perspectives and participation opportunities of people with mental illness have been additionally worsened.


Assuntos
Transtornos Mentais , Reabilitação Vocacional , Alemanha , Humanos , Transtornos Mentais/diagnóstico , Transtornos Mentais/reabilitação , Reabilitação Vocacional/psicologia , Inquéritos e Questionários
10.
J Phys Condens Matter ; 33(33)2021 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-34062517

RESUMO

We have synthesized high-quality single crystals of SnxPb1-xTe and carried out detailed studies of the magnetotransport properties of one of the samples, Sn0.05Pb0.95Te. Longitudinal magnetoresistance increases almost linearly with increasing applied field (H) and reaches ∼310% atH= 13 T. At higher fields, both longitudinal and Hall resistance show clear Shubnikov de Haas oscillations. The oscillations are smooth and periodic, and there exists only one frequency,fα∼ 57 T. However, an additional frequency,fß∼ 69 T, appears as the angle between the field direction and the normal to the sample surface (θ) is increased. Bothfαandfßexhibitθ-dependence;fαdecreases whereasfßincreases gradually with increasingθ. The presence of two frequencies in Sn0.05Pb0.95Te indicates that there exist two Fermi surface pockets (αandßpockets). We have constructed the Landau-level fan plot and determined the Berry phase (δ) for theαpocket to beδ∼ 0.1. Thisδvalue is very close to the expected value of 0 for a topologically trivial system.

11.
Ophthalmologe ; 118(4): 383-390, 2021 Apr.
Artigo em Alemão | MEDLINE | ID: mdl-32632495

RESUMO

Cerebral folate deficiency (CFD) results in neurological alterations and a massive degeneration of the choroid/retina if left untreated, which limit the visual field and visual acuity. This article reports the case of a female patient with CFD, who developed autistic personal characteristics prior to reaching school age and first started to speak at the age of 3 years. At the age of 6 years she was presented because of unclear reduced visual acuity in the right eye. At that time mild bilateral peripheral chorioretinal atrophy was present, which subsequently became more pronounced. Additionally, a centrally emphasized chorioretinal atrophy further developed. Visual acuity of both eyes progressively deteriorated until stagnating at 0.1 at the age of 14 years. The causal assignment of the findings of the patient was not possible for many years. Choroideremia was excluded by molecular genetic testing (CHM gene with no mutations) and gyrate atrophy was ruled out by a normal ornithine level. The existence of a mitochondrial disease was almost completely excluded by exome sequencing. After the onset of further nonocular symptoms, e.g. neuromuscular disorders, electroencephalograph (EEG) alterations and autistic disorder, intensified laboratory diagnostics were performed in the treating pediatric hospital. Finally, an extremely low level of the folic acid metabolite 5­methyltetrahydrofolate was detected in the cerebrospinal fluid (CSF) leading to the diagnosis of CFD. High-dose substitution treatment with folic acid was subsequently initiated. After excluding the presence of a pathogenic mutation of the FOLR1 gene for the cerebral folate receptor 1, a high titer blocking autoantibody against cerebral folate receptor 1 was detected as the cause.


Assuntos
Deficiência de Ácido Fólico , Degeneração Retiniana , Adolescente , Atrofia , Criança , Pré-Escolar , Feminino , Receptor 1 de Folato/genética , Ácido Fólico , Deficiência de Ácido Fólico/diagnóstico , Deficiência de Ácido Fólico/tratamento farmacológico , Deficiência de Ácido Fólico/genética , Humanos
12.
Top Stroke Rehabil ; 27(6): 442-452, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-31960760

RESUMO

OBJECTIVES: Visual field defects due to hemi- or quadrantanopia after stroke represent an under-recognized neurological symptom with inefficient instruments for neurorehabilitation to date. We here examined the effects of training in a virtual reality (VR) supermarket on cognitive functions, depressive symptoms, and subjective cognitive complaints in patients with hemianopia/quadrantanopia and healthy controls. METHODS: During a 14-day rehabilitation program, 20 patients and 20 healthy controls accomplished a real-life-like shopping task in a VR supermarket. A comparison between pre- and post-training standard neuropsychological measures, depressive symptoms, and subjective memory complaints allowed us to assess a putative transfer of rehabilitation effects from the training tasks to specific cognitive functions. RESULTS: The results indicate that VR training may improve performance not only in the trained task but also in specific neuropsychological functions. After the training, both patients and controls showed improved performances in visual scanning, mental rotation, visuoconstruction, and cognitive flexibility. Moreover, depressive symptoms were attenuated in both groups. In the patient group compared to the control group, the training particularly resulted in improved visual memory retrieval and reduced memory complaints. CONCLUSIONS: The results of the current study suggest that VR training can improve particularly visual-spatial skills in patients with hemianopia or quadrantanopia. Our study thus introduces an interesting novel treatment approach to improve cognitive functions relevant to daily life in stroke patients with visual field defects.


Assuntos
Transtornos Cognitivos , Cognição , Reabilitação do Acidente Vascular Cerebral , Realidade Virtual , Transtornos Cognitivos/reabilitação , Humanos , Reabilitação Neurológica , Memória Espacial , Acidente Vascular Cerebral , Reabilitação do Acidente Vascular Cerebral/métodos , Sobreviventes , Campos Visuais
13.
J Clin Exp Neuropsychol ; 42(3): 307-318, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-31918594

RESUMO

Introduction: Loss of motivation is a core feature of major depression (MDD) and has been suggested to influence neuropsychological performance. However, previous studies have come to inconsistent results, but they were only done under laboratory test conditions. Thus, the aim of the present study is to experimentally investigate the influence of motivation on neurocognition under real-life-like conditions.Methods: Twenty-two inpatients with MDD (M = 42.5 years) and 27 demographically comparable healthy control subjects (HC) underwent a new memory paradigm under real-life-like conditions: To bridge the "waiting time" before a planned neuropsychological assessment, subjects were shown two videos on the waiting room TV with different motivational appeals. Video 1 (lower motivation) deals with factual information about the research department's history. Video 2 (higher motivation) consists of information about a current lottery. The video stories were developed by analogy to the established "Logical Memory" test. Subjective motivation was assessed by a short form of the Intrinsic Motivation Inventory. After 30 min, subjects had to perform an unexpected free recall and recognition of the video content during the intended test session.Results: MDD patients, different from HC subjects, rated their intrinsic motivation for the presentation of video 2 as higher compared to video 1. Two-way repeated measures analyses of variance as well as post-hoc tests showed a significant effect of motivation on the MDD patients' memory scores for video 2.Conclusions: The results provide support for an association between motivation and neurocognition in depressed patients and suggest that cognition under real-life-like conditions can be improved more in MDD patients relative to healthy controls with the use of motivational interventions.


Assuntos
Transtorno Depressivo Maior/psicologia , Transtornos da Memória/psicologia , Motivação , Adolescente , Adulto , Idoso , Cognição , Transtorno Depressivo Maior/complicações , Transtorno Depressivo Maior/terapia , Feminino , Humanos , Masculino , Transtornos da Memória/etiologia , Transtornos da Memória/terapia , Rememoração Mental , Pessoa de Meia-Idade , Testes Neuropsicológicos , Reconhecimento Psicológico , Adulto Jovem
14.
Neuropsychiatr ; 33(3): 123-130, 2019 Sep.
Artigo em Alemão | MEDLINE | ID: mdl-30875025

RESUMO

Major depressive disorder is characterized by changes in the emotional state, e. g. the diminished experience of positive emotions, as well as cognitive impairments such as concentration and memory difficulties. These emotional and cognitive dysfunctions are closely interrelated and play a key role for the development and maintenance of depressive symptoms. For instance, patients with depression show negatively biased information processing that affects attention and memory as well as their reaction to feedback. In addition, there is an increased motivation to avoid negatively evaluated conditions and at the same time a reduced motivation to approach positive goals. Furthermore, depressed patients often show a specific style of thinking, called rumination, which involves repeated, intensive thinking about the causes, consequences and symptoms of one's own negative feelings. In this review, the different relationships between emotional, motivational and cognitive symptoms of depressive patients will be presented and the influence of their interaction on cognitive performance will be discussed. The highlighted clinical relevance of emotional-cognitive dysfunctions should be considered more often in therapeutic interventions for depressed patients.


Assuntos
Viés de Atenção , Disfunção Cognitiva/complicações , Disfunção Cognitiva/psicologia , Depressão/complicações , Transtorno Depressivo Maior/complicações , Transtorno Depressivo Maior/psicologia , Emoções , Memória , Disfunção Cognitiva/terapia , Depressão/psicologia , Depressão/terapia , Transtorno Depressivo Maior/terapia , Humanos , Motivação , Ruminação Cognitiva
16.
Transl Res ; 203: 57-72, 2019 01.
Artigo em Inglês | MEDLINE | ID: mdl-30213530

RESUMO

Genome editing represents a powerful tool to treat inherited disorders. Highly specific endonucleases induce a DNA double strand break near the mutant site, which is subsequently repaired by cellular DNA repair mechanisms that involve the presence of a wild type template DNA. In vivo applications of this strategy are still rare, in part due to the absence of appropriate animal models carrying human disease mutations and knowledge of the efficient targeting of endonucleases. Here we report the generation and characterization of a new mouse model for X-linked retinitis pigmentosa (XLRP) carrying a point mutation in the mutational hotspot exon ORF15 of the RPGR gene as well as a recognition site for the homing endonuclease I-SceI. Presence of the genomic modifications was verified at the RNA and protein levels. The mutant protein was observed at low levels. Optical coherence tomography studies revealed a slowly progressive retinal degeneration with photoreceptor loss starting at 9 months of age, paralleling the onset of functional deficits as seen in the electroretinogram. Early changes to the outer retinal bands can be used as biomarker during treatment applications. We further show for the first time efficient targeting using the I-SceI enzyme at the genomic locus in a proof of concept in photoreceptors following adeno-associated virus mediated gene transfer in vivo. Taken together, our studies not only provide a human-XLRP disease model but also act as a platform to design genome editing technology for retinal degenerative diseases using the currently available endonucleases.


Assuntos
Proteínas de Transporte/genética , Modelos Animais de Doenças , Proteínas do Olho/genética , Edição de Genes , Retinose Pigmentar/genética , Retinose Pigmentar/terapia , Animais , Humanos , Camundongos , Camundongos Knockout , Mutação , RNA Mensageiro , Reação em Cadeia da Polimerase Via Transcriptase Reversa
17.
Biomed Res Int ; 2018: 1048317, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30186847

RESUMO

In daily life, myopia is a frequent cause of reduced visual acuity (VA) due to missing or incomplete optical correction. While the genetic cause of high myopia itself is not well understood, a significant number of cases are secondary to hereditary malfunctions or degenerations of the retina. The mechanism by which this occurs remains yet unclear. Two female siblings, 4 y and 2 y, respectively, from a consanguineous Pakistani family were referred to our department for reduced VA and strabismus. Both girls were highly myopic and hence were further examined using standard clinical tests and electroretinography (ERG). The latter confirmed confounded electrical coupling of photoreceptors and bipolar cells. Further inquiry and testing confirmed a similar condition for the father including impaired night vision, reduced VA, photophobia, and an equally characteristic ERG. Findings in the mother were unremarkable. Subsequent genetic analysis of autosomal recessive and X-linked genes for congenital stationary night blindness (CSNB) revealed a novel homozygous splice site mutation in CACNA1F in the two girls transmitted from both the father and the mother. While in males the above clinical constellation is a frequent finding, this report, to the authors' knowledge, is the first demonstrating biallelic mutations at the CACNA1F locus in females.


Assuntos
Canais de Cálcio Tipo L/genética , Mutação , Miopia/genética , Cegueira Noturna/genética , Pré-Escolar , Eletrorretinografia , Feminino , Doenças Genéticas Ligadas ao Cromossomo X , Alemanha , Humanos , Itália , Linhagem , Irmãos , Suíça , Acuidade Visual
19.
J Phys Condens Matter ; 30(18): 185601, 2018 May 10.
Artigo em Inglês | MEDLINE | ID: mdl-29542441

RESUMO

We present a systematic quantum oscillations study on a metallic, p-type Bi2Te3 topological single crystal in magnetic fields up to B = 7 T. The maxima/minima positions of oscillations measured at different tilt angles align to one another when plotted as a function of the normal component of magnetic field, confirming the presence of the 2D Fermi surface. Additionally, the Berry phase, ß = 0.4 ± 0.05 obtained from the Landau level fan plot, is very close to the theoretical value of 0.5 for the Dirac particles, confirming the presence of topological surface states in the Bi2Te3 single crystal. Using the Lifshitz-Kosevich analyses, the Fermi energy is estimated to be [Formula: see text] meV, which is lower than that of other bismuth-based topological systems. The detection of surface states in the Bi2Te3 crystal can be explained by our previous hypothesis of the lower position of the Fermi surface that cuts the 'M'-shaped valence band maxima. As a result, the bulk state frequency is shifted to higher magnetic fields, which allows measurement of the surface states signal at low magnetic fields.

20.
Seizure ; 53: 103-109, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29169028

RESUMO

PURPOSE: Depressive and anxiety disorders are frequent among people with epilepsies. There are, however, only few longitudinal studies, which examine the relationship between these comorbid psychiatric disorders and epilepsy-related variables. Thus, we investigated the interrelationships of depression and anxiety symptoms with seizure frequency across time. METHODS: Before admittance to an epilepsy center (T1) and six months after discharge (T2), patients (n=198) with mainly difficult-to-treat epilepsies completed the Hospital Anxiety and Depression Scale (HADS). Correlation and path analyses were conducted. RESULTS: Depression and anxiety symptoms (HADS) as well as seizure frequency significantly decreased from baseline to follow-up. Both at T1 and T2, seizure frequency was slightly, but significantly correlated with depression and anxiety levels (rs=0.17-.32). Cross-lagged-analyses showed that baseline (T1) level of depression significantly predicted frequency of seizures at follow-up (T2). However, anxiety at T1 was not a significant predictor of seizure frequency at T2 and seizure frequency at T1 did not predict either depressive or anxiety symptoms at T2. CONCLUSION: The present findings emphasize the importance of psychiatric comorbidities, especially depression, for seizure frequency and its progress in patients with difficult-to-treat epilepsies referred to a specialized epilepsy center. Thus, comorbid psychiatric disorders need specific consideration as part of a comprehensive diagnostic and therapeutic treatment approach.


Assuntos
Transtornos de Ansiedade/fisiopatologia , Transtorno Depressivo/fisiopatologia , Epilepsia Resistente a Medicamentos/fisiopatologia , Adolescente , Adulto , Idoso , Transtornos de Ansiedade/epidemiologia , Comorbidade , Transtorno Depressivo/epidemiologia , Epilepsia Resistente a Medicamentos/epidemiologia , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
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