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An experimental investigation of the mechanical properties of copper B370 and stainless steel 434 dissimilar welded joints is presented in this paper. In this study the TIG welding of dissimilar copper B370 and stainless steel 434 welded joint were made of 100 × 50mm plates with silicon bronze as filler then investigated under orthogonal array of L9 experiments. From the experimental study it is concluded that maximum Vickers hardness of 110 and tensile strength of 238.21MPa can be achieved with a process parameters combination of 130 amps of welding current, 60 IPM of feed rate and 15V of voltage for the welding joint. By using the regression equation, this sample has shown the greatest strength of 233.35 MPa with an error percentage of 2.04% compared with experimental result. Microstructure examination revealed that the base of copper B370 and base of stainless steel 434 has twin alpha grain and twin austenite grain respectively. Heat affected zone of copper B370 and stainless steel revealed that both has complete fusion between the weld and base metal. Welding zone reveals Cu-Fe-Mn eutectic particles in the matrix of Cu solid solution.

BackgroundThe COVID-19 pandemic has exacerbated the backlog of elective surgeries across the National Health Service (NHS). This is particularly critical for patients awaiting cardiac surgery, where even short delays can lead to disease progression and increased risk of complications. Enhanced Recovery After Surgery (ERAS) programmes aim to optimise recovery and reduce length of stay, yet their implementation in cardiac surgery remains inconsistent. This quality improvement project sought to improve the implementation of postoperative ERAS principles to increase the timeliness of recovery and enhance intensive care unit (ICU) capacity.MethodsTime-directed ERAS goals were developed, and a phased educational intervention was implemented through four Plan–Do–Study–Act cycles: (1) introductory teaching and baseline data collection, (2) development of a tool within the electronic patient record to promote real-time implementation of ERAS goals and enable continuous performance monitoring, (3) introduction of an e-learning module and (4) targeted educational interventions. Outcome measures included time to achieve ERAS goals and the proportion of postoperative patients clinically ready for discharge to the ward within 24 and 48 hours. Balancing measures included reintubation and ICU readmission rates.ResultsImplementation of the phased educational intervention led to a sustained reduction in the time required to achieve ERAS goals. The proportion of patients clinically ready for discharge to the ward within 24 and 48 hours increased by 15.6% and 18.0%, respectively, exceeding the project’s 5% target. No increase in reintubation or ICU readmission rates was observed, indicating that improvements were achieved safely.ConclusionsImplementing time-directed ERAS goals through a phased educational intervention increased the timeliness of post-operative recovery after cardiac surgery. This approach has the potential to improve patient flow, enhance ICU capacity and support wider efforts to address elective cardiac surgery backlogs across the NHS.

Introduction Diffuse axonal injury is an extremely common type of traumatic brain injury encountered in motor vehicle crashes, sports injuries, and in combat. Although many cases of diffuse axonal injury result in chronic disability, there are no current treatments for this condition. Its basic lesion, traumatic axonal injury, has been aggressively modeled in primate and rodent animal models. The inexorable axonal and perikaryal degeneration and dysmyelination often encountered in traumatic axonal injury calls for regenerative therapies, including therapies based on stem cells and precursors. Here we explore the proof of concept that treatments based on transplants of human oligodendrocyte progenitor cells can replace or remodel myelin and, eventually, contribute to axonal regeneration in traumatic axonal injury. Methods We derived human oligodendrocyte progenitor cells from the human embryonic stem cell line H9, purified and characterized them. We then transplanted these human oligodendrocyte progenitor cells into the deep sensorimotor cortex next to the corpus callosum of nude rats subjected to traumatic axonal injury based on the impact acceleration model of Marmarou. We explored the time course and spatial distribution of differentiation and structural integration of these cells in rat forebrain. Results At the time of transplantation, over 90 % of human oligodendrocyte progenitor cells expressed A2B5, PDGFR, NG2, O4, Olig2 and Sox10, a profile consistent with their progenitor or early oligodendrocyte status. After transplantation, these cells survived well and migrated massively via the corpus callosum in both injured and uninjured brains. Human oligodendrocyte progenitor cells displayed a striking preference for white matter tracts and were contained almost exclusively in the corpus callosum and external capsule, the striatopallidal striae, and cortical layer 6. Over 3 months, human oligodendrocyte progenitor cells progressively matured into myelin basic protein(+) and adenomatous polyposis coli protein(+) oligodendrocytes. The injured environment in the corpus callosum of impact acceleration subjects tended to favor maturation of human oligodendrocyte progenitor cells. Electron microscopy revealed that mature transplant-derived oligodendrocytes ensheathed host axons with spiral wraps intimately associated with myelin sheaths. Conclusions Our findings suggest that, instead of differentiating locally, human oligodendrocyte progenitor cells migrate massively along white matter tracts and differentiate extensively into ensheathing oligodendrocytes. These features make them appealing candidates for cellular therapies of diffuse axonal injury aiming at myelin remodeling and axonal protection or regeneration.

A 42-year-old man diagnosed with chondrosarcoma of the proximal femur underwent limb salvage by compartmental excision of the lesion and reconstruction with a custom-made hip prosthesis. The critical-size defect in the proximal femur was reconstructed with ceramic hemicylinders that were tied in place with sutures and augmented with two fibular strut grafts and an autologous cancellous iliac crest bone graft. A fourteen-year follow-up of the same case revealed that substituted ceramic matrices can be converted into dynamic, metabolically active, living bone.

Introduction: To mitigate the spread of the pandemic coronavirus infection (COVID-19), governments across the world have adopted \"lockdowns\" which have confined many individuals to their homes. This disrupts normal life routines, elements of which are important circadian cues. The pandemic is also associated with new stressors, altered roles, and uncertainties about health and economic security, which are also likely to affect sleep. The current study is an online survey of sleep experience, routines, physical activity, and symptoms of anxiety and depression, to study the alterations associated with the lockdown. Materials and Methods: The survey was conducted in early May 2020 using a questionnaire circulated through social media platforms. Questions related to demographic characteristics, current and previous sleep schedules, routine, and working patterns. Insomnia (Insomnia Severity Index - 4), Stress (Perceived Stress Scale - 4), anxiety and depressive symptoms (Patient Health Questionnaire - 4) and physical activity (International Physical Activities Questionnaire) were assessed using standardized instruments. Results: A total of 958 valid responses were received. Compared to the prelockdown period, there was a shift to a later bedtime and waking time, with a reduction in night-time sleep and an increase in day-time napping. These effects were visible across occupational groups, but mostly affected working individuals except health professionals. Sleep quality deteriorated across groups. Reductions in sleep duration were associated with depressive symptoms. Conclusions: The COVID-19 lockdown is associated with changes in sleep schedule and in the quantity and quality of night-time sleep. Although these changes are associated with elevated rates of emotional symptoms, it is unclear from these cross-sectional results, whether sleep deterioration produces psychological distress, or vice versa.

The rationale: Retromaxillary lesions pose diagnostic and treatment delays due to their location. With classical methods posing great morbidity, advances like Peizotome and microscope-assisted surgeries have gained relevance for efficient management with lesser complications and faster postoperative recovery. Case: A 65-year-old male patient presents with complaints of pain and blurring of the right eye for 10 days. Diagnosis: Clinical and radiological evaluation revealed right eye proptosis with a slow-growing retromaxillary infratemporal tumor with a likely diagnosis of trigeminal schwannoma. Treatment: Surgical management was aided by a piezo-assisted transantral approach for microscope-enabled debulking of the tumor. Outcomes: The final histopathological diagnosis was of schwannoma with the patient having a good postsurgical recovery. Takeaway lesson: Peizotome-assisted transmaxillary approach for microscopic excision of retromaxillary lesions can be considered as a surgical marvel which combines two varied modes of treatment for better patient outcomes.

The traditional Le Fort level 1 osteotomy has proven to be an effective in approaching central skull base lesions. The challenge being - stabilization of the down-fractured maxilla in an amenable position for tumour resection. The authors describe a simple technique to overcome the task of stabilizing the down-fractured maxilla.