Early dysfunction of functional connectivity in healthy elderly with subjective memory complaints

It is still an open question whether subjective memory complaints (SMC) can actually be considered to be clinically relevant predictors for the development of an objective memory impairment and even dementia. There is growing evidence that suggests that SMC are associated with an increased risk of dementia and with the presence of biological correlates of early Alzheimer's disease. In this paper, in order to shed some light on this issue, we try to discern whether subjects with SMC showed a different profile of functional connectivity compared with subjects with mild cognitive impairment (MCI) and healthy elderly subjects. In the present study, we compare the degree of synchronization of brain signals recorded with magnetoencephalography between three groups of subjects (56 in total): 19 with MCI, 12 with SMC and 25 healthy controls during a memory task. Synchronization likelihood, an index based on the theory of nonlinear dynamical systems, was used to measure functional connectivity. Briefly, results show that subjects with SMC have a very similar pattern of connectivity to control group, but on average, they present a lower synchronization value. These results could indicate that SMC are representing an initial stage with a hypo-synchronization (in comparison with the control group) where the brain system is still not compensating for the failing memory networks, but behaving as controls when compared with the MCI subjects

V Edición. Competencias para el empleo: autonomía, responsabilidad y toma de decisiones

El proyecto “V edición. Competencias para el empleo: autonomía, responsabilidad y toma de decisiones” tiene por objetivo acompañar a estudiantes de la Facultad de Educación en el desarrollo de herramientas para reforzar su autoconocimiento y la toma de decisiones en su inserción en el mundo laboral con optimismo, de forma responsable y colaborativa. Desde esta perspectiva, se ofrecen a los estudiantes herramientas básicas y avanzadas de búsqueda de empleo, trabajando elementos esenciales como el autoconocimiento para el diseño del curriculum vitae, junto con acciones específicas dirigidas a la puesta en marcha de iniciativas para la creación de empresas. Esta formación se estructura en un taller con tres módulos formativos complementarios de tres sesiones cada uno

14-day triple, 5-day concomitant, and 10-day sequential therapies for Helicobacter pylori infection in seven Latin American sites: a randomised trial

Evidence from Europe, Asia, and North America suggests that standard three-drug regimens of a proton pump inhibitor plus amoxicillin and clarithromycin are significantly less effective for eradicating Helicobacter pylori (H. pylori) infection than five-day concomitant and ten-day sequential four-drug regimens that include a nitroimidazole. These four-drug regimens also entail fewer antibiotic doses and thus may be suitable for eradication programs in low-resource settings. Studies are limited from Latin America, however, where the burden of H. pylori-associated diseases is high

Risk of Recurrent Helicobacter pylori Infection 1 Year After Initial Eradication Therapy in 7 Latin American Communities

The long-term effectiveness of Helicobacter pylori eradication programs for preventing gastric cancer will depend on recurrence risk and individual and community factors

Formación de los tutores de las prácticas externas como herramienta eficaz en la mejora del aprendizaje del estudiante y su inserción laboral

El objetivo del proyecto es mejorar la calidad de la tutorización de las prácticas externas y fomentar las buenas prácticas que garanticen el proceso de enseñanza-aprendizaje. Están implicados tutores académicos, externos, instituciones y estudiante

BDNF Val66Met Polymorphism and Gamma Band Disruption in Resting State Brain Functional Connectivity: A Magnetoencephalography Study in Cognitively Intact Older Females

The pathophysiological processes undermining brain functioning decades before the onset of the clinical symptoms associated with dementia are still not well understood. Several heritability studies have reported that the Brain Derived Neurotrophic Factor (BDNF) Val66Met genetic polymorphism could contribute to the acceleration of cognitive decline in aging. This mutation may affect brain functional connectivity (FC), especially in those who are carriers of the BDNF Met allele. The aim of this work was to explore the influence of the BDNF Val66Met polymorphism in whole brain eyes-closed, resting-state magnetoencephalography (MEG) FC in a sample of 36 cognitively intact (CI) older females. All of them were ε3ε3 homozygotes for the apolipoprotein E (APOE) gene and were divided into two subgroups according to the presence of the Met allele: Val/Met group (n = 16) and Val/Val group (n = 20). They did not differ in age, years of education, Mini-Mental State Examination scores, or normalized hippocampal volumes. Our results showed reduced antero-posterior gamma band FC within the Val/Met genetic risk group, which may be caused by a GABAergic network impairment. Despite the lack of cognitive decline, these results might suggest a selective brain network vulnerability due to the carriage of the BDNF Met allele, which is linked to a potential progression to dementia. This neurophysiological signature, as tracked with MEG FC, indicates that age-related brain functioning changes could be mediated by the influence of particular genetic risk factors

Gestión del conocimiento. Perspectiva multidisciplinaria. Volumen 17

El libro “Gestión del Conocimiento. Perspectiva Multidisciplinaria”, Volumen 17 de la Colección Unión Global, es resultado de investigaciones. Los capítulos del libro, son resultados de investigaciones desarrolladas por sus autores. El libro es una publicación internacional, seriada, continua, arbitrada, de acceso abierto a todas las áreas del conocimiento, orientada a contribuir con procesos de gestión del conocimiento científico, tecnológico y humanístico. Con esta colección, se aspira contribuir con el cultivo, la comprensión, la recopilación y la apropiación social del conocimiento en cuanto a patrimonio intangible de la humanidad, con el propósito de hacer aportes con la transformación de las relaciones socioculturales que sustentan la construcción social de los saberes y su reconocimiento como bien público

Subjective memory complaints in elderly: relationship with health status, multimorbidity, medications, and use of services in a population-based study

Background: This study examines the associations between subjective memory complaints (SMC) and health variables: multimorbidity, presence of certain diseases, health perceived state, difficulties seeing and hearing, pain, and use of medications and health services. Furthermore, we aim to identify risk groups based on multimorbidity and calculate the effect size for each of these relationships. Methods: Cross-sectional epidemiological study using a face-to-face interview with a structured questionnaire. Sample size: 1,342 people aged 65 years and older taken from a random sample of the census tracts. SMC were studied using questions regarding memory complaints. Results: Multimorbidity and polypharmacy are associated with SMC, so are impaired vision and hearing. SMC are more frequently present in people who use health services more intensively and exhibit reduced functional activity as a result of diseases. With respect to specific diseases, only cerebrovascular accidents and chronic constipation were associated with SMC. In regression analysis, predictors of SMC were vision and hearing impairment, poor self-perceived health, pain, and general practitioner visits. However, the effect size of these factors is low. The variables that indicate risk groups are number of diseases, reduced functional activity, hearing impairment, and poor self-perceived health. Conclusions: Memory complaints are a heterogeneous phenomenon. Our results confirm that multimorbidity, polypharmacy, greater use of health services, pain, and poor self-perceived health are associated with SMC. We identified two risk groups with a high percentage of complaints and a healthy group with a low percentage. Detecting these factors and these risk and healthy groups is useful in achieving proper patients management.Depto. de Psicología Experimental, Procesos Cognitivos y LogopediaFac. de PsicologíaTRUEpu

¿Hay un déficit de comprensión gramatical multidominio en el Deterioro Cognitivo Leve?

Multidomain mild Cognitive Impairment (mMCI) patients have similar difficulties than those observed in the initial stages of Alzheimer disease. Many studies have explored language abilities in MCI, but few have focused in grammatical comprehension. This study explores the differences between mMCI patients and controls using a complete neuropsychological battery, it tries to discover if vocabulary and grammatical comprehension in both groups are predicted by naming and verbal fluency, and seeks the best subset of sentence structures to classify the subjects. There were significative differences between groups in verbs and in grammatical comprehension. Linear regression revealed that verb and sentence comprehension are independent of naming and verbal fluency performance in mMCI patients. In the control group verb comprehension is predicted by intrusions in verbal fluency, and the comprehension of sentences containing two propositions seems to be related to control processes and recognition errors. Two sentence structures, both not fitted to syntactic canonical order in Spanish, are especially useful for subjects’ classification. mMCI patients have a specific deficit affecting grammatical comprehension that doesn’t seem to depend on their low performance at lexical-semantic level. In healthy elders, verb and grammatical comprehension are related to control processes.Depto. de Psicología Experimental, Procesos Cognitivos y LogopediaFac. de PsicologíaTRUEpu

Genetic Predictors of Change in Episodic Verbal Memory by Cognitive Intervention: ACT, PICALM, BDNF, NRG1, APOE Genes and Their Interactions in Situations of Cognitive Demand

Background: Cognitive interventions (CIs) in the elderly are activities that seek to improve cognitive performance and delay its deterioration. Our objectives were to study potential genetic predictors of how a CI program may influence immediate and delayed episodic verbal memory (EVM). Methods: 162 participants were elderly individuals without dementia who were randomized into parallel control and experimental groups. Participants underwent genetic testing to analyze the PICALM, ACT, NRG1, BDNF and APOE genes. We performed a broad neuropsychological assessment before and 6 months after the CI. The CI involved multifactorial training (30 sessions). The control group undertook the centre’s standard activities. The main outcome measures were the genotype studied as a predictor of post-intervention changes in EVM. Results: We found the CI was associated with improvements in several cognitive functions, including immediate and delayed EVM. While no individual gene was associated with any such change, the interaction between PICALM/ACT (p = 0.008; Eta2 = 0.23) and PICALM/NRG1 (p = 0.029; Eta2 = 0.19) was associated with improved immediate EVM, and the NRG1/BDNF interaction was associated with improved delayed EVM (p = 0.009; Eta2 = 0.21). The APOEε4 genotype was not associated with any change in EVM. Conclusions: Our study shows that the participants’ genotype can have an impact on the results of CIs. Cognitive stress may stimulate the interaction of various genes and as such, different types of CI should be established for distinct groups of people taking into account the individual’s characteristics, like genotype, to improve the results of this type of health prevention and promotion activity