Balancing is an essential challenge in healthcare systems that requires effective strategies. This study aims to address this crucial issue by suggesting a practical approach. We show the potential of balancing a regional healthcare system to improve its utility. We consider a regional healthcare system comprising multiple hospitals with different sizes, capacities, quality of service, and accessibility. We define a utility function for the system based on the sectorization concept, which endeavors to form a balance between hospitals in terms of essential outputs such as waiting times and demands. The dynamic nature of the system means that this balance degrades over time, necessitating periodic sectorization, which is called resectorization. Our methodology stands out for incorporating resectorization as a dynamic strategy, enabling more flexible and responsive adaptations to continuously changing healthcare needs. Unlike previous studies, based on a system-oriented approach, our resectorization scenarios include the periodic closure of some hospitals. This enables us to enhance both the capacity and quality of healthcare facilities. Furthermore, in contrast to other studies, we investigate the states of diminishing demand throughout the resectorization process. To provide empirical insights, we conduct a simulation using data from a real-world case study. Our analysis spans multiple time periods, enabling us to dynamically quantify the utility of the healthcare system. The numerical findings demonstrate that substantial utility improvements are attainable through the defined scenarios. The study suggests a practical solution to the critical challenge of balancing issues in regional healthcare systems.

BACKGROUND: The calcaneus is the most commonly fractured tarsal bone. Diagnosis is often challenging due to subtle radiographic changes and requires timely identification to prevent complications, including subtalar arthritis, neurovascular injury, malunion, osteomyelitis, and compartment syndrome. Treatment varies based on fracture type, with non-surgical methods for non-displaced stress fractures and surgical interventions for displaced or intra-articular fractures.
METHODS: This study utilized the Wisdom in Diagnostic Imaging Simulation (WIDI SIM) platform, an emergency imaging simulation designed to assess radiology resident preparedness for independent call. During an 8-hour simulation, residents were tested on 65 cases across various imaging modalities of varying complexity, including normal studies. A single, unique case of calcaneal fracture was included within the simulation in four separate years of testing. Cases were assessed using a standardized grading rubric by subspecialty radiology faculty, with errors subsequently classified by type.
RESULTS: A total of 1279 residents were tested in five separate years on the findings of calcaneal fractures of 5 different patients. Analysis revealed a consistent pattern of missed diagnoses across all training years, primarily attributed to observational errors. There was limited improvement with training progression as all training years exhibited similar average performance levels.
CONCLUSIONS: Calcaneal fractures pose a diagnostic challenge due to their frequent subtle radiographic findings, especially in stress fractures. Simulation-based evaluations using WIDI SIM highlighted challenges in radiology residents\' proficiency in diagnosing calcaneal fractures. Addressing these challenges through targeted education and exposure to diverse cases is essential to improve diagnostic accuracy and reduce complications with calcaneal fractures.

BACKGROUND: Simulation medicine is no longer just a modern trend and has become a standard part of education and training of the medical staff and students in many countries around the world. Its validity and benefits have been acknowledged and its necessity is reflected in the recommendations of the European Board and College of Obstetrics and Gynaecology.
OBJECTIVE: The aim of our work was to map the current state of simulation training at large obstetrics and gynaecology departments in the Czech Republic including the equipment available, teaching environment conditions and human resources and to find out to what extent individual teaching methods are being used in undergraduate and postgraduate education.
METHODS: We have collected the information using a questionnaire which focused on the equipment available to the departments, teaching environment conditions, human resources, and types of simulation methods being used in undergraduate and postgraduate training as well as the spectrum of courses being offered.
CONCLUSIONS: Our finding is that large obstetrics and gynaecology departments in the Czech Republic are well equipped, have good teaching environments available to them, and are able to use most of the current simulation teaching methods. On the other hand, except for an operative vaginal birth course, only a small number of other simulation courses are currently being offered. Data from the survey are further used to discuss the possibilities of developing simulation training in this field in the Czech Republic.

OBJECTIVE: To develop a non-linear mixed-effects population pharmacokinetic and pharmacodynamic (PK-PD) model describing the change in the concentration of methotrexate polyglutamates in erythrocytes (ery-MTX-PGn with \"n\" number of glutamate, representing PK component) and how this relates to modified 28-joint Disease Activity Score incorporating erythrocyte sedimentation rate (DAS-28-3) for rheumatoid arthritis (RA), representing PD component.
METHODS: An existing PK model was fitted to data from a study consisting of 117 RA patients. The estimation of population PK-PD parameters was performed using stochastic approximation expectation maximisation algorithm in Monolix 2021R2. The model was used to perform Monte Carlo simulations of a loading dose regimen (50mg subcutaneous methotrexate as loading doses, then 20mg weekly oral methotrexate) compared to a standard dosing regimen (10mg weekly oral methotrexate for 2 weeks, then 20mg weekly oral methotrexate).
RESULTS: Every 40 nmol/L increase in ery-MTX-PG3-5 total concentration correlated with 1-unit reduction in DAS-28-3. Significant covariate effects on the therapeutic response of methotrexate included the use of prednisolone in the first 4 weeks (positive use correlated with 25% reduction in DAS-28-3 when other variables were constant) and patient age (every 10-year increase in age correlated with 3.4% increase in DAS-28-3 when other variables were constant). 4 methotrexate loading doses led to a higher percentage of patients achieving a good/moderate response compared to the standard regimen (Week 4: 87.6% vs. 39.8%; Week 10: 64.7% vs. 57.0%).
CONCLUSIONS: A loading dose regimen was more likely to achieve higher ery-MTX-PG concentration and better therapeutic response after 4 weeks of methotrexate treatment.

If a mutated gene with heterozygous advantage against malaria, e.g., hemoglobin S (HbS) gene, is introduced in a small tribe, the gene (allele) frequency (fgene) increases until it reaches a steady state value (feq) where the total mortality from malaria and sickle cell disease is a minimum. This is a classic example of balanced-polymorphism named malaria hypothesis. In a previous in silico study, assuming realistic initial conditions, it has been shown that the feq is around 14%, far less than the fgene observed in certain parts of Africa, 24%. It seems that the malaria hypothesis, per se, could not explain such a high fgene, unless it is assumed that malaria and HbS gene can provide protection against other diseases. Using Monte-Carlo simulation, the current study was conducted to examine the effect on feq of five scenarios was examined. The studied scenarios consisted of different combinations of mortality of other diseases and the possible amounts of protections conferred by malaria and HbS gene against the diseases. Taking into account other diseases causing mortality in the population makes the fgene rate of change steeper over generations. feq is an increasing function of the amount of protection conferred by HbS gene against other diseases. The effect of protection provided by malaria against other diseases on feq, is however, variable-depending on the amount of protection conferred by HbS gene against other diseases, it may increase or decrease feq. If malaria and HbS gene provide protections of 1.5-fold and threefold against other diseases, respectively, the feq is around 24%, the amount reported in certain tribes of Africa. Under certain scenarios, the feq attained is even higher.

Minecraft is a game known for its limitless potential for creation, allowing players to construct elaborate structures, explore vast landscapes, and encounter a variety of creatures and scenarios, all within a controlled, virtual environment. Similarly, our dreams are constructed by the subconscious mind, using the \"blocks\" of memories, emotions, and sensory experiences accumulated during waking life. This editorial highlights the intricate relationship between the dream worlds created in sleep and the virtual landscapes we explore in Minecraft, highlighting how both territories are constructed from the building blocks of our subconscious mind. It emphasizes the role of dreams as simulators for real-life events, particularly in mitigating potential risks, much like Minecraft allows players to engage in risk-free exploration and problem-solving within its pixelated universe. In addition, this editorial aims to illuminate the functions of dreams in memory consolidation, emotional processing, and brain development while showcasing the importance of creativity and imagination in enhancing our mental health and understanding of reality.

BACKGROUND: During a critical event in the labor and delivery operating room, it is crucial for team members responding to the situation to be aware of the designated leaders. Visual and verbal cues have been utilized to designate leadership in various healthcare settings; however, previous research has indicated mixed results using visual cues for role designation.
METHODS: The purpose of this study was to explore the use of the red surgical hat as a visual cue of leadership during obstetric emergency simulation training. We used a mixed-methods design to analyze simulation-based education video and debriefing transcripts.
RESULTS: There was a statistically significant difference in the proportion of participants who declared leadership vs. those who donned the red hat. Participants were more likely to visually declare leadership utilizing a red surgical bouffant hat than to verbally declare leadership. Most participants indicated that observing the red hat to detect leadership in the operating room was more effective than when leaders used a verbal declaration to inform others who was leading.
CONCLUSIONS: Our findings suggest that utilizing a visual cue of leadership with the red surgical bouffant hat improves participant perceptions of communication of the surgical team during an obstetrical critical event in a simulation environment.

BACKGROUND: Simulation training in cardiopulmonary resuscitation (CPR) is effective but active practice time is limited given the large number of students and the learning effect size remains small. To improve learning during observation, the use of an observer tool (OT) has been advocated. The aim was to assess the value of OT to improve medical students\' learning outcomes during CPR simulation training.
METHODS: This prospective, randomized study took place during CPR training of medical students. The workshop targeted recognition of unconsciousness, absence of breathing, call for help, cardiac massage and defibrillation. Students practicing in dyads were randomized to use an OT (i.e., a checklist summarizing CPR skills and step-by-step actions) (OT +) or not (OT-) when observing others. At the end of the training, the global performance of the dyad was assessed by an evaluator using the OT checklist (primary outcome). The non-technical skills (NTS), chest compression quality, perceived improvement in knowledge and skills and knowledge score (MCQ) were also recorded.
RESULTS: The student dyads were included (OT + : n = 40 and OT-: n = 41). Immediately after training, the global performance was similar between the two groups: OT + : 24 [23-25] and OT-: 23 [21-24] (out of 25), p = 0.052. However, better learning of breathing assessment and cardiac massage performance, as well as a better knowledge score, were found in the OT + group. No significant difference was observed for NTS or perceived improvement in knowledge and skills. Satisfaction was higher in the OT- group.
CONCLUSIONS: The use of an OT during CPR simulation did not show any pedagogical benefit on the global performance of medical students. However, a potential benefit was found for several important secondary outcomes. Further studies are needed to confirm these positive results.

The most effective way of delivering regional anaesthesia training and the best means of demonstrating competency have not been established. Clinical competency, based on the Dreyfus and Dreyfus lexicon, appears unachievable using current training approaches. Lessons should be taken from the worlds of music, chess, and sports. Modern skills training programmes should be built on an explicit and detailed understanding with measurement of a variety of factors such as perception, attention, psychomotor and visuospatial function, and kinesthetics, coupled with quantitative, accurate, and reliable measurement of performance.

OBJECTIVE: Laparoscopic cholecystectomy is a commonly performed surgery with risk of serious complications. Intraoperative cholangiography (IOC) can mitigate these risks by clarifying the anatomy of the biliary tree and detecting common bile duct injuries. However, mastering IOC interpretation is largely through experience, and studies have shown that even expert surgeons often struggle with this skill. Since no formal curriculum exists for surgical residents to learn IOC interpretation, we developed a perceptual learning (PL)-based training module aimed at improving surgical residents\' IOC interpretation skills.
METHODS: Surgical residents were assessed on their ability to identify IOC characteristics and provide clinical recommendations using an online training module based on PL principles. This research had 2 phases. The first phase involved pre/post assessments of residents trained via the online IOC interpretation module, measuring their IOC image recognition and clinical management accuracy (percentage of correct responses), response time and confidence. During the second phase, we explored the impact of combining simulator-based IOC training with the online interpretation module on same measures as used in the first phase (accuracy, response time, and confidence).
METHODS: The study was conducted at Rush University Medical College in Chicago. The participants consisted of surgical residents from each postgraduate year (PGY). Residents participated in this study during their scheduled monthly rotation through Rush\'s surgical simulation center.
RESULTS: Total 23 surgical residents participated in the first phase. A majority (95.7%) found the module helpful. Residents significantly increased confidence levels in various aspects of IOC interpretation, such as identifying complete IOCs and detecting abnormal findings. Their accuracy in making clinical management decisions significantly improved from pretraining (mean accuracy 68.1 +/- 17.3%) to post-training (mean accuracy 82.3 +/- 10.4%, p < 0.001). Furthermore, their response time per question decreased significantly from 25 +/- 12 seconds to 17 +/- 12 seconds (p < 0.001). In the second phase, we combined procedural simulator training with the online interpretation module. The 20, first year residents participated and 88% found the training helpful. The training group exhibited significant confidence improvements compared to the control group in various aspects of IOC interpretation with observed nonsignificant accuracy improvements related to clinical management questions. Both groups demonstrated reduced response times, with the training group showing a more substantial, though nonsignificant, reduction.
CONCLUSIONS: This study demonstrated the effectiveness of a PL-based training module for improving aspects of surgical residents\' IOC interpretation skills. The module, found helpful by a majority of participants, led to significant enhancements in clinical management accuracy, confidence levels, and decreased response time. Incorporating simulator-based training further reinforced these improvements, highlighting the potential of our approach to address the lack of formal curriculum for IOC interpretation in surgical education.