Acute Stress in Health Workers during Two Consecutive EpidemicWaves of COVID-19

The COVID-19 pandemic has provoked generalized uncertainty around the world, with health workers experiencing anxiety, depression, burnout, insomnia, and stress. Although the effects of the pandemic on mental health may change as it evolves, the majority of reports have been web-based, cross-sectional studies. We performed a study assessing acute stress in frontline healthworkers during two consecutive epidemic waves. After screening for trait anxiety/depression and dissociative experiences, we evaluated changes in acute stress, considering resilience, state anxiety, burnout, depersonalization/derealization symptoms, and quality of sleep as cofactors. During the first epidemic wave (April 2020), health workers reported acute stress related to COVID-19, which was related to state anxiety. After the first epidemic wave, acute stress decreased, with no increase during the second epidemic wave (December 2020), and further decreased when vaccination started.During the follow-up (April 2020 to February 2021), the acute stress score was related to bad quality of sleep. However, acute stress, state anxiety, and burnout were all related to trait anxiety/depression, while the resilience score was invariant through time. Overall, the results emphasize the relevance of mental health screening before, during

Crustal structure from 2-D gravity and magnetic data modeling, magnetic power spectrum inversion, and seismotectonics in the Laguna Salada basin, northern Baja California, Mexico

Hemos construido un modelo 2-D de la estructura de la corteza que explica datos aeromagnéticos y de gravedad en un perfil entre la Sierra Juárez y la parte occidental del Valle de Mexicali, cruzando la cuenca Laguna Salada. El modelo ha sido acotado utilizando inferencias independientes acerca de la estructura cortical obtenidas a partir de estudios de refracción sísmica y del modelo Airy-Heiskannen de compensación isostática, mediciones de la densidad de masa y de susceptibilidad magnética en muestras de roca y de un registro de densidad de masa en un pozo, así como con resultados de la inversión del espectro de densidad de potencia de anomalías magnéticas. Nuestro modelo 2-D sugiere que la Sierra Juárez tiene una raíz que se extiende hasta una profundidad de 42 km y que la interfase corteza-manto alcanza una profundidad de 25 km en la región de la cuenca Laguna Salada, Sierra Cucapá, y la parte más occidental del Valle de Mexicali. La inversión del espectro de potencia y el modelo 2-D sugieren que la base de la corteza magnetizada está a ~16 km de profundidad en la región de la Sierra Cucapá. En el modelo 2-D, la geometría de la cuenca Laguna Salada sugiere una estructura de medio graben, donde el basamento profundiza hacia el oriente, con un relleno sedimentario máximo del orden de 3 km. La zona sismogénica alcanza una profundidad de casi 20 km, en concordancia con la profundidad inferida a partir del análisis espectral de las anomalías magnéticas. La microsismicidad en la cuenca Laguna Salada ocurre en cúmulos de eventos que indican zonas de debilidad en donde se relajan los esfuerzos. Los hipocentros se localizaron entre 0 y 19.6 km, siendo más profundos en las márgenes de la cuenca, con tendencias que, dentro de los errores de localización, correlacionan bien con el sistema regional de fallas en el área en estudio. Los mecanismos focales determinados evidencian deformación transtensional, en concordancia con el marco tectónico regional. doi: https://doi.org/10.22201/igeof.00167169p.2001.40.2.37

Stratigraphy and structure of the Altar basin of NW Sonora: Implications for the history of the Colorado River delta and the Salton trough

The Altar basin in northwestern Sonora, Mexico, is a subsidiary basin forming a now inactive part of the Colorado River delta. Its sedimentary record illustrates how the delta prograded in the last 4-5 Ma over a late Miocene, structurally distinct, marine basin at the northern end of the Gulf of California. Our interpretation of outcrop data, and data from seven exploratory wells, six analog seismic lines of Petróleos Mexicanos (PEMEX), and magnetic and gravity surveys from various sources indicates the existence of three sedimentary sequences, A, B, and C, which can be correlated at regional scale and have a thickness >5 km at the basin depocenter. The lower sedimentary sequence A is a shale unit representing open marine conditions (outer neritic). It grades into a thick sequence of interstratifi ed mudstone, siltstone, and sandstone (sequence B), which grades in turn into poorly consolidated sand (sequence C). Extensive outcrops of a sandy, cut and fi ll succession exposed along the coast of Sonora are consistent with sequences B and C being the sub-aqueous and the sub-aereal parts of the delta, respectively. A contact at the base of the sequence A, where pre-marine continental deposits are missing, and where the marine sequence overlies crystalline basement, is interpreted as tectonic transport along a top-to-the-northwest detachment fault. The Altar basin became inactive as result of the westward shift in the locus of tectonic activity from the Altar fault to the Cerro Prieto fault, coupled with realignments in the course of the Colorado River during Pleistocene time

Curie point depth from spectral analysis of aeromagnetic data for geothermal reconnaissance in Afghanistan

The geologic setting of Afghanistan has the potential to contain significant mineral, petroleum and geothermal resources. However, much of the country's potential remains unknown due to limited exploration surveys. Here, we present countrywide aeromagnetic data to estimate the Curie point depth (CPD) and to evaluate the geothermal exploration potential.CPD is an isothermal surface at which magnetic minerals lose their magnetization and as such outlines an isotherm of about 580 °C. We use spectral analysis on the aeromagnetic data to estimate the CPD spatial distribution and compare our findings with known geothermal fields in the western part of Afghanistan.The results outline four regions with geothermal potential: 1) regions of shallow Curie point depths (~16-21 km) are located in the Helmand basin. 2) regions of intermediate depths (~21-27 km) are located in the southern Helmand basin and the Baluchistan area. 3) Regions of great depths (~25-35 km) are located in the Farad block. 4) Regions of greatest depths (~35-40 km) are located in the western part of the northern Afghanistan platform. The deduced thermal structure in western Afghanistan relates to the collision of the Eurasian and Indian plates, while the shallow CPDs are related to crustal thinning. This study also shows that the geothermal systems are associated with complex magmatic and tectonic association of major intrusions and fault systems. Our results imply geothermal gradients ranging from 14 °C/km to 36 °C/km and heat-flow values ranging from 36 to 90 mW/m&lt;sup&gt;2&lt;/sup&gt; for the study area.</p

Rabdomioma cardiaco tratado quirúrgicamente con éxito y revisión de la literatura

Los tumores cardiacos primarios son raros, con incidencia variable en todas las edades del 0.005 al 0.05%. En pacientes pediátricos, la incidencia es del 0.27%. Los tumores más frecuentes durante la infancia son los rabdomiomas cardiacos, considerados como benignos. Aunque la expresión clínica es amplia, en la mayoría de los casos son asintomáticos y se detectan por la presencia de soplos. En la etapa prenatal se manifiestan con arritmias o hydrops fetalis. En algunos neonatos y lactantes se encuentran arritmias, datos de bajo gasto cardíaco o muerte súbita. La asociación con esclerosis tuberosa se ha observado hasta en un 81%. Se presenta el caso de paciente masculino neonato, con diagnóstico de rabdomioma cardiaco que inicialmente estaba asintomático, sin embargo en el seguimiento requirió de tratamiento quirúrgico a los 5 meses de edad, por datos de insuficiencia cardiaca secundaria a obstrucción del tracto de salida del ventrículo derecho. A 5 meses de la cirugía, el paciente está asintomátic