Holocene thinning in central Greenland controlled by the Northeast Greenland Ice Stream.

Ice-core records from the interior of the Greenland ice sheet suggest widespread thinning during the Holocene. However, the recurring underestimation of this thinning in numerical models raises concerns about both the veracity of such reconstructions and the reliability of glaciological models. Recent work suggests the 8000-year-old Northeast Greenland Ice Stream (NEGIS), including a now-extinct northern tributary, may have been an early influence on Greenland ice-sheet dynamics. Yet, the inaccurate reproduction of NEGIS-like dynamics in most models hampers investigation of whether this feature played a role in Holocene ice-sheet thinning. Here we show that grounding-line retreat in northeast Greenland triggers elevation changes at the northern summit via ice-dynamic effects modulated by the paleo NEGIS system. In our simulations, fast ice-stream flow caused by transiently imposed reduced basal shear stress following the northeast retreat explains 55% ( ± 18%) of the estimated ice thinning, showing that ice-stream dynamics is one of the main drivers of the NGRIP Holocene surface elevation drop. Our findings show that the ice-flow in northeast Greenland plays a large role in ice-surface elevation changes in central Greenland.

Overshooting the critical threshold for the Greenland ice sheet.

Melting of the Greenland ice sheet (GrIS) in response to anthropogenic global warming poses a severe threat in terms of global sea-level rise (SLR)1. Modelling and palaeoclimate evidence suggest that rapidly increasing temperatures in the Arctic can trigger positive feedback mechanisms for the GrIS, leading to self-sustained melting2-4, and the GrIS has been shown to permit several stable states5. Critical transitions are expected when the global mean temperature (GMT) crosses specific thresholds, with substantial hysteresis between the stable states6. Here we use two independent ice-sheet models to investigate the impact of different overshoot scenarios with varying peak and convergence temperatures for a broad range of warming and subsequent cooling rates. Our results show that the maximum GMT and the time span of overshooting given GMT targets are critical in determining GrIS stability. We find a threshold GMT between 1.7 °C and 2.3 °C above preindustrial levels for an abrupt ice-sheet loss. GrIS loss can be substantially mitigated, even for maximum GMTs of 6 °C or more above preindustrial levels, if the GMT is subsequently reduced to less than 1.5 °C above preindustrial levels within a few centuries. However, our results also show that even temporarily overshooting the temperature threshold, without a transition to a new ice-sheet state, still leads to a peak in SLR of up to several metres.

Artificial Intelligence and the Simulationists.

SUMMARY STATEMENT: The recent introduction of ChatGPT, an advanced, easy-to-use, and freely available artificial intelligence (AI) program, created new possibilities across many industries and professions including healthcare simulation. ChatGPT has the potential to streamline healthcare simulation-based education while also providing insights for the scenario development process that conventional case development may miss. However, there are issues related to accuracy, relevance, and structure of the products produced by the ChatGPT AI program. This article examines 2 AI-generated simulation case examples highlighting strengths and weaknesses while providing guidance on the use of ChatGPT as a simulation resource.

When Precision Meets Penmanship: ChatGPT and Surgery Documentation.

ChatGPT (Chatbot Generative Pre-Trained Transformer) is an artificial intelligence with several potential applications in the field of medicine. As a large language model, it is particularly good at generating text. This study investigates the use of ChatGPT in constructing operation notes for laparoscopic appendicectomy, one of the most common surgical procedures in the UK. We prompted ChatGPT-4, the latest generation of ChatGPT, to produce operation notes for laparoscopic appendicectomy, which were then evaluated against 'Getting It Right First Time' (GIRFT) recommendations. GIRFT is an organisation that has collaborated with the National Health Service (NHS) to improve surgical documentation guidelines. Excluding certain items documented elsewhere in patient records, the generated notes were assessed against 30 key points in GIRFT recommendations. This process was repeated three times to obtain an average score. Our results showed that ChatGPT generated operation notes in seconds, with an average coverage of 78.8% (23.66 out of 30 points) of the GIRFT guidelines, surpassing average compliance with similar guidelines from the Royal College of Surgeons (RCS). However, the quality of ChatGPT's output was found to be dependent on the quality of the prompt, highlighting the need for verification of the generated content. Additionally, secure integration with electronic health records is required before ChatGPT can be adopted into the NHS.

Modelo de gestión del cuidado de enfermería en servicios de atención primaria en salud / Nursing care management model in primary health care services

RESUMEN Objetivo: Describir los modelos de gestión del cuidado de enfermería en servicios de atención primaria en salud. Metodología: Se empleó el paradigma positivista desde la perspectiva cuantitativa, apoyada en la revisión documental-bibliográfica, lo que contribuyó a la recolección de la información mediante la indagación exhaustiva y critica de artículos arbitrados, tesis y bibliografías especializadas, logrando cumplir los objetivos planteados por los investigadores, contribuyendo a la generación de conocimiento. Resultados: Se describen la Gestión Integral de Riesgo, Gestión Clínica, Modelos Comunitarios de Salud Familiar, Adaptación de Sor Callista Roy. En conclusión: La atención primaria de salud juega un rol de gran importancia en los diferentes países del mundo, ya que mediante la gestión de políticas públicas en materia de salud, se previenen en gran medida las enfermedades y su complicación, se destaca la función de los profesionales de enfermería como los principales promotores del cuidado, de forma integral, de las personas sanas y enfermas.

ABSTRACT Objective: To describe the models of nursing care management in primary health care services. Methodology: The positivist paradigm was used from the quantitative perspective, supported by the documentary-bibliographic review, which contributed to the collection of information through the exhaustive and critical inquiry of refereed articles, theses and specialized bibliography, achieving the objectives set by the researchers, contributing to the generation of knowledge. Results: Integrated Risk Management, Clinical Management, Community Models Family Health, Adaptation of Sister Callista Roy are described. In conclusion: Primary health care plays a role of great importance in the different countries of the world, since through the management of public health policies, diseases and their complications are largely prevented, and the role of nursing professionals as the main promoters of comprehensive care for healthy and sick people is emphasized.

Time-scale synchronisation of oscillatory responses can lead to non-monotonous R-tipping.

Rate-induced tipping (R-tipping) describes the fact that, for multistable dynamic systems, an abrupt transition can take place not only because of the forcing magnitude, but also because of the forcing rate. In the present work, we demonstrate through the case study of a piecewise-linear oscillator (PLO), that increasing the rate of forcing can make the system tip in some cases but might also prevent it from tipping in others. This counterintuitive effect is further called non-monotonous R-tipping (NMRT) and has already been observed in recent studies. We show that, in the present case, the reason for NMRT is the peak synchronisation of oscillatory responses operating on different time scales. We further illustrate that NMRT can be observed even in the presence of additive white noise of intermediate amplitude. Finally, NMRT is also observed on a van-der-Pol oscillator with an unstable limit cycle, suggesting that this effect is not limited to systems with a discontinuous right-hand side such as the PLO. This insight might be highly valuable, as the current research on tipping elements is shifting from an equilibrium to a dynamic perspective while using models of increasing complexity, in which NMRT might be observed but hard to understand.

Modelo de gestión del cuidado de enfermería en servicios de atención primaria en salud / Nursing care management model in primary health care services

Describir los modelos de gestión del cuidado de enfermería en servicios de atención primaria en salud. Metodología: Se empleó el paradigma positivista desde la perspectiva cuantitativa, apoyada en la revisión documental-bibliográfica, lo que contribuyó a la recolección información mediante la indagación excautiva y critica de artículos arbitrados, tesis y bibliografía especializada, logrando cumplir los objetivos planteados por los investigadores, contribuyendo a la generación de cocimiento. Resultados: Se describen el Gestión Integral de Riesgo, Gestión Clínica, Modelos Comunitarios Salud Familiar, Adaptación de Sor Callista Roy. En conclusión: La atención primaria de salud juega un rol de gran importancia en los diferentes países del mundo, ya que mediante la gestión políticas públicas en materia de salud se previenen en gran medida las enfermedades y su complicación, se desataca la función de los profesionales de enfermería como los principales promotores del cuidado de forma integral de las personas sanas y enfermas.

To describe the models of nursing care management in primary health care services. Methodology: The positivist paradigm was used from the quantitative perspective, supported by the documentary-bibliographic review, which contributed to the collection of information through the exhaustive and critical inquiry of refereed articles, theses and specialized bibliography, achieving the objectives set by the researchers, contributing to the generation of knowledge. Results: Integrated Risk Management, Clinical Management, Community Models Family Health, Adaptation of Sister Callista Roy are described. In conclusion: Primary health care plays a role of great importance in the different countries of the world, since through the management of public health policies, diseases and their complications are largely prevented, and the role of nursing professionals as the main promoters of comprehensive care for healthy and sick people is emphasized.

Impact of ultra-conservative ICD programming in patients with LVADs: Avoiding potentially unnecessary tachy-therapies.

BACKGROUND: Patients with left ventricular assist devices (LVAD) often tolerate ventricular arrhythmias (VA). We aim to assess the frequency and outcomes of ICD therapies averted by ultraconservative ICD programming (UCP) in LVAD patients. METHODS: This single center, retrospective cohort study included patients with LVADs and ICDs implanted from 2015 to 2019 that had UCP. The aim for UCP was to maximally delay VA treatments and maximize anti-tachycardia pacing (ATP) prior to ICD shocks. VA events were reviewed after UCP and evaluated under prior conservative programming to assess for potentially averted events (that would have resulted in either ATP or defibrillation with prior programming). RESULTS: Fifty patients were included in the study with follow-up of median 16 ± 10.2 months after UCP. The median time from LVAD implantation to reprogramming was 7 days (IQR 5-9 days). Fourteen patients (28%) had potentially averted VA events that would have been treated with their prior ICD programming (82 total events, median two events per patient, IQR 1-10 events). Treated VA events occurred in 15 patients (30%). Eleven of the 14 patients with potentially averted VAs had treated events as well. Only one patient reported definitive symptoms of self-limited "dizziness" during a potentially averted event that did not result in hospitalization. No patients died of complications from or needed emergent care/hospitalization due a potentially averted VA. CONCLUSIONS: UCP in LVAD patients likely prevented unnecessary VA treatments in many patients with minimal reported symptoms during these potentially averted events. Prospective studies are necessary to confirm these findings.

Monitoring Xenon Capture in a Metal Organic Framework Using Laser-Induced Breakdown Spectroscopy.

Molten salt reactor operation will necessitate circulation of a cover gas to remove certain evolved fission products and maintain an inert atmosphere. The cover gas leaving the reactor core is expected to contain both noble and non-noble gases, aerosols, volatile species, tritium, and radionuclides and their daughters. To remove these radioactive gases, it is necessary to develop a robust off-gas system, along with novel sensors to monitor the gas stream and the treatment system performance. In this study, a metal organic framework (MOF) was engineered for the capture of Xe, a major contributor to the off-gas source term. The engineered MOF column was tested with a laser-induced breakdown spectroscopy (LIBS) sensor for noble gas monitoring. The LIBS sensor was used to monitor breakthrough tests with various Xe, Kr, and Ar mixtures to determine the Xe selectivity of the MOF column. This study offers an initial demonstration of the feasibility of monitoring off-gas treatment systems using a LIBS sensor to aid in the development of new capture systems for molten salt reactors.

Electromagnetic interference from left ventricular assist devices detected in patients with implantable cardioverter-defibrillators.

INTRODUCTION: Electromagnetic interference (EMI) from left ventricular assist devices (LVADs) can cause implantable cardioverter-defibrillator (ICD) oversensing. We sought to assess the frequency of inappropriate shocks/oversensing due to LVAD-related EMI and prospectively compare integrated (IB) versus dedicated bipolar (DB) sensing in patients with LVADs. METHODS: Single-center study in LVAD patients with Medtronic or Abbott ICDs between September 2017 and March 2020. We excluded patients that were pacemaker dependent. Measurements were obtained of IB and DB sensing and noise to calculate a signal-to-noise ratio (SNR). Device checks were reviewed to assess appropriate and inappropriate sensing events. RESULTS: Forty patients (age 52 ± 14 years, 75% men, 38% ischemic cardiomyopathy) were included with the median time between LVAD implantation and enrollment of 6.7 months (2.3, 11.4 months). LVAD subtypes included: HeartWare (n = 22, 55%), Heartmate II (n = 10, 25%), and Heartmate III (n = 8, 20%). Over a follow-up duration of 21.6 ± 12.9 months after LVAD implantation, 5% of patients (n = 2) had oversensing of EMI from the LVAD (both with HeartWare LVADs and Abbott ICDs) at 4 days and 10.8 months after LVAD implantation. Both patients underwent adjustment of ventricular sensing with resolution of oversensing and no further events over 5 and 15 months of further follow-up. The SNR was similar between IB and DB sensing (50 [29-67] and 57 [41-69], p = 0.89). CONCLUSION: ICD oversensing of EMI from LVADs is infrequent and can be managed with reprogramming the sensitivity. There was no significant difference in the R-wave SNR with IB versus DB ICD leads.

Elucidating the mechanisms of Paraffin-Olefin separations using nanoporous adsorbents: An overview.

Light olefins are the precursors of all modern-day plastics. Olefin is always mixed with paraffins in the time of production, and therefore it needs to be separated from paraffins to produce polymer-grade olefin. The state-of-the-art separation technique, cryogenic distillation, is highly expensive and hazardous. Adsorption could be a novel, sustainable, and inexpensive separation strategy, provided a suitable adsorbent can be designed. There are different types of mechanisms that were harnessed for the separation of olefins by adsorption, and in this review, we have focused our discussion on those mechanisms. These mechanisms include, (a) Affinity-based separation, like pi complexation and hydrogen bonding, (b) Separation based on pore size and shape, like size-exclusion and gate-opening effect, and (c) Non-equilibrium separation, like kinetic separation. In this review, we have elaborated each of the separation strategies from the fundamental level and explained their roles in the separation processes of different types of paraffins and olefins.

Unusual presentation of infective endocarditis in ICU.

Bacterial endocarditis remains a challenging condition to manage owing to its variety of different presentations. This report describes a 55-year-old woman with endocarditis who presented confused with shoulder and back pain. Initial diagnosis was made difficult by a negative echocardiogram but aided by striking peripheral stigmata. She was treated for infective endocarditis as she met all five Duke's minor criteria for infective endocarditis. Gallium scan was a useful investigation in identifying lumbar spine and acromioclavicular joint septic foci. This case highlights the challenges of diagnosing endocarditis. It also describes how gallium scans can be useful in identifying occult septic emboli in these patients.

Neurite outgrowth inhibitory levels of organophosphates induce tissue transglutaminase activity in differentiating N2a cells: evidence for covalent adduct formation.

Organophosphate compounds (OPs) induce both acute and delayed neurotoxic effects, the latter of which is believed to involve their interaction with proteins other than acetylcholinesterase. However, few OP-binding proteins have been identified that may have a direct role in OP-induced delayed neurotoxicity. Given their ability to disrupt Ca2+ homeostasis, a key aim of the current work was to investigate the effects of sub-lethal neurite outgrowth inhibitory levels of OPs on the Ca2+-dependent enzyme tissue transglutaminase (TG2). At 1-10 µM, the OPs phenyl saligenin phosphate (PSP) and chlorpyrifos oxon (CPO) had no effect cell viability but induced concentration-dependent decreases in neurite outgrowth in differentiating N2a neuroblastoma cells. The activity of TG2 increased in cell lysates of differentiating cells exposed for 24 h to PSP and chlorpyrifos oxon CPO (10 µM), as determined by biotin-cadaverine incorporation assays. Exposure to both OPs (3 and/or 10 µM) also enhanced in situ incorporation of the membrane permeable substrate biotin-X-cadaverine, as indicated by Western blot analysis of treated cell lysates probed with ExtrAvidin peroxidase and fluorescence microscopy of cell monolayers incubated with FITC-streptavidin. Both OPs (10 µM) stimulated the activity of human and mouse recombinant TG2 and covalent labelling of TG2 with dansylamine-labelled PSP was demonstrated by fluorescence imaging following SDS-PAGE. A number of TG2 substrates were tentatively identified by mass spectrometry, including cytoskeletal proteins, chaperones and proteins involved protein synthesis and gene regulation. We propose that the elevated TG2 activity observed is due to the formation of a novel covalent adduct between TG2 and OPs.

Increased maternal abdominal subcutaneous fat thickness and body mass index are associated with increased cesarean delivery: A prospective cohort study.

INTRODUCTION: Early pregnancy body mass index (BMI) is known to predict adverse pregnancy outcomes but does not account for body fat distribution. This study aimed to determine prospectively whether maternal abdominal subcutaneous fat thickness (SCFT) measured by ultrasound at the fetal morphology scan is a better predictor than BMI of mode of delivery and other pregnancy outcomes. MATERIAL AND METHODS: This was a prospective cohort study of women delivering singleton neonates at a tertiary public hospital. Women were included if they had appropriate images at the routine fetal anomaly ultrasound scan and delivered in the facility. The primary outcome was mode of delivery categorized as cesarean section or vaginal delivery. The relation between maternal SCFT and BMI was described using the Pearson correlation coefficient. The association of maternal abdominal SCFT BMI at booking-in was compared with pregnancy outcomes using univariate linear and logistic regression. RESULTS: SCFT and BMI were obtained for 997 women. The median (interquartile range) SCFT was 15.3 mm (12.8-19.6) and median (interquartile range) BMI 24.3 kg/m2 (21.7-28.3). Maternal abdominal SCFT and BMI were highly correlated (R2  = 0.55). Both were significantly associated with cesarean delivery: SCFT per 5 mm (odds ratio [OR] 1.32, 95% confidence interval (CI) 1.18-1.48; BMI per 5 kg/m2 OR 1.29, 95% CI 1.15-1.44. CONCLUSIONS: Maternal abdominal SCFT and BMI were both significantly associated with cesarean delivery and other outcomes. More research is needed to define the strengths of maternal SCFT in predicting pregnancy outcomes.

Cardiopulmonary Arrest and Extracorporeal Membrane Oxygenation: Case Report and Review.

National trends suggest that less than one in four patients experiencing in-hospital cardiac arrest (IHCA) in the United States survive to discharge. This is especially relevant as the rates of IHCA are expected to rise in the years to come. Only a modest upward trend in survival to discharge among patients with IHCA over the past decade warrants evaluation of novel ideas to improve outcomes postcardiopulmonary resuscitation. One such idea is that the use of veno-arterial-extracorporeal membrane oxygenation (VA-ECMO) to augment standard advanced cardiac life support algorithm in patients with an identifiable and reversible cause of cardiac arrest would improve survival to discharge. Here, we present the case of a patient with refractory ventricular fibrillation arrest who was transitioned to VA-ECMO immediately following cardiac catheterization for an IHCA.