Evaluation of a Low-Cost Commercial Actigraph and Its Potential Use in Detecting Cultural Variations in Physical Activity and Sleep.

The purpose of the present study was to evaluate the performance of a low-cost commercial smartwatch, the Xiaomi Mi Band (MB), in extracting physical activity and sleep-related measures and show its potential use in addressing questions that require large-scale real-time data and/or intercultural data including low-income countries. We evaluated physical activity and sleep-related measures and discussed the potential application of such devices for large-scale step and sleep data acquisition. To that end, we conducted two separate studies. In Study 1, we evaluated the performance of MB by comparing it to the GT3X (ActiGraph, wGT3X-BT), a scientific actigraph used in research, as well as subjective sleep reports. In Study 2, we distributed the MB across four countries (Austria, Germany, Cuba, and Ukraine) and investigated physical activity and sleep among these countries. The results of Study 1 indicated that MB step counts correlated highly with the scientific GT3X device, but did display biases. In addition, the MB-derived wake-up and total-sleep-times showed high agreement with subjective reports, but partly deviated from GT3X predictions. Study 2 revealed similar MB step counts across countries, but significant later wake-up and bedtimes for Ukraine than the other countries. We hope that our studies will stimulate future large-scale sensor-based physical activity and sleep research studies, including various cultures.

Sleep during COVID-19 lockdown: A cross-cultural study investigating job system relevance.

Our study aimed to assess the change in the sleep patterns during the Coronavirus lockdown in five regions (Austria/Germany, Ukraine, Greece, Cuba and Brazil), using online surveys, translated in each language. Part of the cohort (age 25-65, well-educated) was collected directly during lockdown, to which retrospective cross-sectional data from and after lockdown (retrospective) questionnaires were added. We investigated sleep times and sleep quality changes from before to during lockdown and found that, during lockdown, participants had (i) worse perceived sleep quality if worried by COVID-19, (ii) a shift of bedtimes to later hours during workdays, and (iii) a sleep loss on free days (resulting from more overall sleep during workdays in non-system relevant jobs), leading to (iv) a marked reduction of social jetlag across all cultures. For further analyses we directly compared system relevant and system irrelevant jobs, because it was assumed that the nature of the lockdown's consequences is dependent upon system relevance. System relevant jobs were found to have earlier wake-up times as well as shorter total sleep times on workdays, leading to higher social jetlag for people in system relevant jobs. Cultural differences revealed a general effect that participants from Greece and Ukraine had later bedtimes (on both work and free days) and wake-up times (on workdays) than Cuba, Brazil and Austria, irrespective of COVID-19 lockdown restrictions.

Xantoastrocitoma pleomórfico / Pleomorphic Xanthoastrocytoma

El xantoastrocitoma pleomórfico, por su extrema rareza, conlleva alta complejidad en el diagnóstico histopatológico. Se presenta el caso clínico en un sujeto de sexo masculino, de 40 años, con antecedentes de crisis convulsivas de presentación tardía, secundarias a meningioma atípico grado II localizado en región occipital izquierda, resecado por dos ocasiones en el transcurso de 6 años. Recibió radioterapia a dosis completa luego de la segunda resección. El diagnóstico histopatológico inicial fue meningioma atípico gra-do II. El paciente acude al HCAM por cefalea holocraneal intensa y hemiparesia braquiocrural derecha; en los estudios de resonancia magnética nuclear con gadolinio se observó el crecimiento de una lesión occipi-tal izquierda con edema perilesional que ameritó resección total de la lesión a través de la craniectomía previa. Como hallazgo macroscópico, se describe una masa violácea que infiltra duramadre carente de un plano de clivaje; el estudio histopatológico detalla una neoplasia glial hipercelular con infiltración difusa con reacción inmunohistoquímica intensa para PGAF (proteína glial acida fibrilar), S100 y CD56 en células tumorales, CD34 positivo. KI67 positivo en 3% y P53 débilmente positivo, compatible con xantoastroci-toma pleomórfico WHO II.(AU)

The pleomorphic xantoastrocytoma, due to its extreme rarity, carries high complexity in the histo-pathological diagnosis. The clinical case is presented in a male subject, 40 years old, with a history of sei-zures with late presentation, secondary to atypical meningioma grade II located in the left occipital region, resected twice in the course of 6 years. He received full-dose radiation therapy after the second resection. The initial histopathological diagnosis was atypical meningioma grade II. The patient comes to HCAM due to intense holocranial headache and right brachiocrural hemiparesis; In the gadolinium nuclear magnetic resonance studies the growth of a left occipital lesion with perilesional edema that warranted total resec-tion of the lesion through previous craniectomy was observed. As a macroscopic finding, a violaceous mass is described which infiltrates dura mater lacking a plane of cleavage; The histopathological study details a hypercellular glial neoplasia with diffuse infiltration with intense immunohistochemical reaction for PGAF (glial acidic glial protein), S100 and CD56 in tumor cells, CD34 positive. It was KI67 positive in 3% and P53 weakly positive, compatible with pleomorphic xantoastrocytoma WHO II. (AU)