Publications by authors named "John Vassiliadis"

Article Synopsis
  • Researchers discovered a potential treatment called BLU-782, a small-molecule inhibitor that selectively targets ALK2, effectively blocking its dysregulated signaling in lab tests.
  • In mouse studies, BLU-782 demonstrated the ability to prevent unwanted bone formation following injury, suggesting it could be a viable preventative treatment for individuals with FOP.
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Objective: Successful endotracheal intubation in the ED requires optimum body positioning. In patients with obesity, the ramp position was suggested to achieve better intubating conditions. However, limited data are available on the airway management practices for patients with obesity in Australasian EDs.

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Introduction: Optimal patient positioning during intubation improves laryngeal view and first pass success, as well as reducing incidence of hypoxia. In certain pre-hospital situations, it may be impractical or impossible for the operator to stand behind the patient.

Objective: We compared intubation in the supine and upright face-to-face positions, with regards to time to intubate and the view of the vocal cords obtained.

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Objective: The aims of the present study were to describe current airway management practices after a failed intubation attempt in Australian and New Zealand EDs and to explore factors associated with second attempt success.

Methods: Data were collected from a multicentre airway registry (The Australian and New Zealand Emergency Department Airway Registry). All intubation episodes that required a second attempt between March 2010 and November 2015 were analysed.

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Unlabelled: Apnoeic oxygenation (ApOx) has been demonstrated to reduce the incidence of desaturation, although evidence of benefit has been conflicting depending on the technique used. The aim of this study was to compare the incidence of desaturation between patients who received ApOx via conventional nasal cannula (NC) and those who did not, using a large, multicentre airway registry.

Methods: This study is an analysis of 24 months of prospectively collected data in the Australia and New Zealand Emergency Department Airway Registry (June 2013-June 2015).

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Objective: To describe the practice and procedure of emergency intubation in Whanganui Emergency Department, New Zealand and determine whether intubation can be carried out effectively in the rural setting.

Method: A prospective observational study using the Australia and New Zealand Airway Registry proforma to collect data on the indication, lead intubator, first-pass success rate and peri-procedural complications. Data were also collected on whether a formal airway assessment was carried out and whether a checklist was used.

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Objective: The aim of this study was to describe the practice of endotracheal intubation across a range of Australasian EDs.

Methods: We established a multicentre airway registry (The Australian and New Zealand Emergency Department Airway Registry [ANZEDAR]) prospectively capturing intubations from 43 Australian and New Zealand EDs over 24 months using the ANZEDAR form. Information recorded included patient demographics, intubation indications, predicted difficulty, rapid sequence induction and endotracheal intubation preparation technique, induction drugs, airway adjuncts and complications.

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Objective: We aim to investigate whether a bundle of changes made to the practice of endotracheal intubation in our ED was associated with an improvement in first pass success rate and a reduction in the incidence of complications.

Methods: We used a prospective observational study.

Results: The data on 360 patients who were intubated during an 18-month period following the introduction of these changes were compared with our previously published observational data.

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Objective: To investigate the first pass success rate, airway grade and complications in two tertiary EDs with the C-MAC video laryngoscope (VL), when compared with standard direct laryngoscopy (DL).

Methods: This was a retrospective analysis of prospectively collected data entered into an airway registry database in the EDs of Royal North Shore and St George Hospitals (SGH) over a 30 month period. Doctors had the choice of using either DL using a Macintosh or Miller blade or a C-MAC VL for the intubation.

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Aim: Life threatening paediatric emergencies are relatively uncommon events. When they do occur staff caring for these children must have the ability to recognise the deterioration, evaluate and simultaneously treat these patients. The aim of this study was to identify suboptimal care during standardised simulated scenarios and to identify the potential causation factors.

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Background: It is well documented that adaptations in cognitive processes with increasing skill levels support decision making in multiple domains. We examined skill-based differences in cognitive processes in emergency medicine physicians, and whether performance was significantly influenced by the removal of contextual information related to a patient's medical history.

Method: Skilled (n=9) and less skilled (n=9) emergency medicine physicians responded to high-fidelity simulated scenarios under high- and low-context information conditions.

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Objective: To describe the practice of endotracheal intubation in the ED of a tertiary hospital in Australia, with particular emphasis on the indication, staff seniority, technique, number of attempts required and the rate of complications.

Methods: A prospective observational study.

Results: Two hundred and ninety-five intubations occurred in 18 months.

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Alterations to the structure of the glomerular filtration barrier lead to effacement of podocyte foot processes, leakage of albumin, and the development of proteinuria. To better understand the signaling pathways involved in the response of the glomerular filtration barrier to injury, we studied freshly isolated rat glomeruli, which allows for the monitoring and pharmacologic manipulation of early signaling events. Administration of protamine sulfate rapidly damaged the isolated glomeruli, resulting in foot process effacement and albumin leakage.

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Oleuropein, a novel immunomodulator derived from olive tree, was assessed in vitro and in experimental sepsis by Pseudomonas aeruginosa. After addition in monocyte and neutrophil cultures, malondialdehyde, TNF-alpha, IL-6, and bacterial counts were estimated in supernatants. Acute pyelonephritis was induced in 70 rabbits after inoculation of pathogen in the renal pelvis.

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Background: The phosphatonins fibroblast growth factor-23 (FGF-23) and FRP-4 are inhibitors of tubular phosphate reabsorption that may play a role in the hyperphosphatemia associated with chronic kidney disease (CKD) or in the hypophosphatemia associated with renal transplants.

Methods: Plasma FGF-23, FRP-4, phosphorus and parathyroid hormone were measured in patients at all stages of CKD. Phosphate regulation of FGF-23 and secreted frizzled related protein-4 (sFRP-4) was examined in end-stage renal disease patients in the presence and absence of therapeutic phosphate binder usage.

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Tumors associated with osteomalacia elaborate the novel factor(s), phosphatonin(s), which causes phosphaturia and hypophosphatemia by cAMP-independent pathways. We show that secreted frizzled-related protein-4 (sFRP-4), a protein highly expressed in such tumors, is a circulating phosphaturic factor that antagonizes renal Wnt-signaling. In cultured opossum renal epithelial cells, sFRP-4 specifically inhibited sodium-dependent phosphate transport.

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Objectives: To describe the establishment of a service to provide bedside focused assessment sonography in trauma and to evaluate the service to date.

Setting: Emergency department of an urban trauma centre.

Methods: A prospective study of trauma patients who received a focused assessment sonography in trauma examination performed by a clinician managing the trauma in the emergency department.

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Objectives: To assess the analgesia practices of ambulance personnel and emergency department staff treating patients with fractured neck of femur.

Methods: This is a retrospective analysis of 176 patients with an admission diagnosis of fractured neck of femur, who presented to a major western Sydney teaching hospital, between January and November 1999.

Results: One hundred and twenty-eight patients met the inclusion criteria.

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Oncogenic osteomalacia (OOM) is associated with primitive mesenchymal tumors that secrete phosphaturic factors resulting in low serum concentrations of phosphate and calcitriol, phosphaturia, and defective bone mineralization. To identify overexpressed genes in these tumors, we compared gene expression profiles of tumors resected from patients with OOM and histologically similar control tumors using serial analysis of gene expression (SAGE). Three hundred and sixty-four genes were expressed at least twofold greater in OOM tumors compared with control tumors.

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