Prevalencia del estreñimiento en una población de pacientes oncológicos, en seguimiento por el equipo de cuidados paliativos / Prevalence of constipation in a cancer patient population followed up by a palliative care team

Objetivos: Determinar la prevalencia del estreñimiento en una población de pacientes oncológicos en seguimiento por el equipo de cuidados paliativos. Describir los tratamientos utilizados para el estreñimiento; comparar la frecuencia de estreñimiento según el tratamiento opioide.Material y métodos: Estudio epidemiológico, observacional y transversal. Realizado íntegramente en el Hospital Universitario Arnau de Vilanova (HUAV) de Lleida. Se utilizó un cuestionario heteroadministrado para entrevistar a pacientes en régimen ambulatorio y hospitalario, con diagnóstico de enfermedad oncológica avanzada, y en seguimiento por el equipo de cuidados paliativos durante un mínimo de 5 días.Variables: La prevalencia de estreñimiento se valoró mediante la aplicación de los criterios Roma IV. Por otra parte, se registraron variables correspondientes a las características basales de los pacientes y a su enfermedad, así como los distintos tratamientos utilizados para combatir el estreñimiento y los fármacos opioides. Para la descripción de variables cualitativas, se utilizaron las frecuencias absoluta y relativa, y para las cuantitativas la media y la desviación típica; para la comparación de las mismas se utilizó el test de Chi cuadrado y la t de Student cuando procedía, con un nivel de significación de 0,05.Resultados: De los 100 pacientes incluidos, 98 fueron aptos para el análisis. Un 19,4 % cumplía los criterios Roma IV de estreñimiento en el momento de la valoración. La proporción de pacientes con diagnóstico de estreñimiento fue mayor en régimen hospitalario sin que esta variable alcanzara la significación estadística. No se detectaron diferencias estadísticamente significativas en la prevalencia de estreñimiento entre los distintos tratamientos opioides. El 53,1 % de los pacientes seguía tratamiento habitual con algún laxante, siendo el más frecuente el hidróxido de magnesio (48,1 %), y solo un 11,5 % recibía tratamiento con más de un laxante...(AU)

Objectives: To determine the prevalence of constipation in oncological patients under follow-up by a palliative care team. To describe the treatments used for constipation, comparing the frequency of constipation according to opioid therapy status.Material and methods: An epidemiological, observational, cross-sectional study. It was completely carried out at the Arnau de Vilanova University Hospital (HUAV) in Lleida. A researcher-administered questionnaire was used to interview outpatients and inpatients diagnosed with advanced cancer disease, and followed up by a palliative care team for a minimum of 5 days.Variables: The prevalence of constipation was assessed by applying the Rome IV criteria. On the other hand, variables corresponding to the baseline characteristics of the patients and their disease were recorded, as were the different treatments used to combat constipation and the use of opioid drugs. Concerning qualitative variables, the absolute and relative frequencies were used; for quantitative variables, the mean and standard deviation were used. For comparisons, the chi-square test and Student’s t-test were used when appropriate, with a significance level of 0.05.Results: Of all 100 patients included, 98 were eligible for the analysis; 19.4 % met the Roma IV criteria for constipation at the time of assessment. No statistically significant differences were detected in the prevalence of constipation between different opioid treatments. Even though the proportion of constipated patients was higher among inpatients, this was not statistically significant. In all, 53.1 % of patients were on regular treatment with some laxative, the most frequent being magnesium hydroxide (48.1 %), and only 11.5 % received treatment with more than one laxative.Conclusions: Taking into consideration all the previous information, constipation continues to be a symptom with a non-negligible prevalence among patients with advanced cancer disease..(AU)

A single session of moderate intensity exercise influences memory, endocannabinoids and brain derived neurotrophic factor levels in men.

Regular physical exercise enhances memory functions, synaptic plasticity in the hippocampus, and brain derived neurotrophic factor (BDNF) levels. Likewise, short periods of exercise, or acute exercise, benefit hippocampal plasticity in rodents, via increased endocannabinoids (especially anandamide, AEA) and BDNF release. Yet, it remains unknown whether acute exercise has similar effects on BDNF and AEA levels in humans, with parallel influences on memory performance. Here we combined blood biomarkers, behavioral, and fMRI measurements to assess the impact of a single session of physical exercise on associative memory and underlying neurophysiological mechanisms in healthy male volunteers. For each participant, memory was tested after three conditions: rest, moderate or high intensity exercise. A long-term memory retest took place 3 months later. At both test and retest, memory performance after moderate intensity exercise was increased compared to rest. Memory after moderate intensity exercise correlated with exercise-induced increases in both AEA and BNDF levels: while AEA was associated with hippocampal activity during memory recall, BDNF enhanced hippocampal memory representations and long-term performance. These findings demonstrate that acute moderate intensity exercise benefits consolidation of hippocampal memory representations, and that endocannabinoids and BNDF signaling may contribute to the synergic modulation of underlying neural plasticity mechanisms.

Effect of acute physical exercise on motor sequence memory.

Acute physical exercise improves memory functions by increasing neural plasticity in the hippocampus. In animals, a single session of physical exercise has been shown to boost anandamide (AEA), an endocannabinoid known to promote hippocampal plasticity. Hippocampal neuronal networks encode episodic memory representations, including the temporal organization of elements, and can thus benefit motor sequence learning. While previous work established that acute physical exercise has positive effects on declarative memory linked to hippocampal plasticity mechanisms, its influence on memory for motor sequences, and especially on neural mechanisms underlying possible effects, has been less investigated. Here we studied the impact of acute physical exercise on motor sequence learning, and its underlying neurophysiological mechanisms in humans, using a cross-over randomized within-subjects design. We measured behavior, fMRI activity, and circulating AEA levels in fifteen healthy participants while they performed a serial reaction time task before and after a short period of exercise (moderate or high intensity) or rest. We show that exercise enhanced motor sequence memory, significantly for high intensity exercise and tending towards significance for moderate intensity exercise. This enhancement correlated with AEA increase, and dovetailed with local increases in caudate nucleus and hippocampus activity. These findings demonstrate that acute physical exercise promotes sequence learning, thus attesting the overarching benefit of exercise to hippocampus-related memory functions.

Human Discrimination and Categorization of Emotions in Voices: A Functional Near-Infrared Spectroscopy (fNIRS) Study.

Functional Near-Infrared spectroscopy (fNIRS) is a neuroimaging tool that has been recently used in a variety of cognitive paradigms. Yet, it remains unclear whether fNIRS is suitable to study complex cognitive processes such as categorization or discrimination. Previously, functional imaging has suggested a role of both inferior frontal cortices in attentive decoding and cognitive evaluation of emotional cues in human vocalizations. Here, we extended paradigms used in functional magnetic resonance imaging (fMRI) to investigate the suitability of fNIRS to study frontal lateralization of human emotion vocalization processing during explicit and implicit categorization and discrimination using mini-blocks and event-related stimuli. Participants heard speech-like but semantically meaningless pseudowords spoken in various tones and evaluated them based on their emotional or linguistic content. Behaviorally, participants were faster to discriminate than to categorize; and processed the linguistic faster than the emotional content of stimuli. Interactions between condition (emotion/word), task (discrimination/categorization) and emotion content (anger, fear, neutral) influenced accuracy and reaction time. At the brain level, we found a modulation of the Oxy-Hb changes in IFG depending on condition, task, emotion and hemisphere (right or left), highlighting the involvement of the right hemisphere to process fear stimuli, and of both hemispheres to treat anger stimuli. Our results show that fNIRS is suitable to study vocal emotion evaluation, fostering its application to complex cognitive paradigms.

Effect of cerebral vasomotion during physical exercise on associative memory, a near-infrared spectroscopy study.

Regular physical exercise has been shown to benefit neurocognitive functions, especially enhancing neurogenesis in the hippocampus. However, the effects of a single exercise session on cognitive functions are controversial. To address this issue, we measured hemodynamic changes in the brain during physical exercise using near-infrared spectroscopy (NIRS) and investigated related effects on memory consolidation processes. Healthy young participants underwent two experimental visits. During each visit, they performed an associative memory task in which they first encoded a series of pictures, then spent 30-min exercising or resting, and finally were asked to recall the picture associations. We used NIRS to track changes in oxygenated hemoglobin concentration over the prefrontal cortex during exercise and rest. To characterize local tissue oxygenation and perfusion, we focused on low frequency oscillations in NIRS, also called vasomotion. We report a significant increase in associative memory consolidation after exercise, as compared to after rest, along with an overall increase in vasomotion. Additionally, performance improvement after exercise correlated positively with power in the neurogenic component (0.02 to 0.04 Hz) and negatively with power in the endothelial component (0.003 to 0.02 Hz). Overall, these results suggest that changes in vasomotion over the prefrontal cortex during exercise may promote memory consolidation processes.