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PubMed Central Canada to be taken offline in February 2018

On February 23, 2018, PubMed Central Canada (PMC Canada) will be taken offline permanently. No author manuscripts will be deleted, and the approximately 2,900 manuscripts authored by Canadian Institutes of Health Research (CIHR)-funded researchers currently in the archive will be copied to the National Research Council’s (NRC) Digital Repository over the coming months. These manuscripts along with all other content will also remain publicly searchable on PubMed Central (US) and Europe PubMed Central, meaning such manuscripts will continue to be compliant with the Tri-Agency Open Access Policy on Publications.

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1.  Subcutaneous Emphysema, Pneumomediastinum and Pneumothorax in a Patient with Dermatomyositis 
Introduction:
Spontaneous pneumomediastinum, pneumothorax, and subcutaneous emphysema are rare, but serious complications of inflammatory myopathies and occur more commonly in DM than PM. complications of dermatomyositis (DM) and polymyositis (PM), both of which can be fatal.
Case Report:
A 20-year-old woman was admitted with neck pain, dyspnea, cough, and fever. She had been diagnosed with dermatomyositis 21 months prior. A thorax computed tomography (CT) scan revealed ground glass opacities in her lungs, pneumomediastinum, pneumothorax, and subcutaneous emphysema. Despite intensive immunosuppressive therapy, clinical deterioration and radiological progression were observed, ultimately the patient died.
Conclusion:
During the care for a patient with dermatomyositis, the otorhinolaryngologist should be cautious of rapidly progressive and fatal neck subcutaneous emphysema. For a patient with dermatomyositis and with normal bronchoscopy and esophagoscopy, the main treatment is control of dermatomyositis with medical therapy. Therefore, a tracheostomy and/or mechanical ventilation may not be necessary.
PMCID: PMC5380398
Dermatomyositis; Pneumomediastinum; Pneumothorax; Polymyositis; Subcutaneous emphysema
2.  Plasma levels of leptin and visfatin in rheumatoid arthritis patients; is there any relationship with joint damage? 
Objective (s):
Rheumatoid arthritis (RA) is a chronic systemic inflammatory disorder, primarily targeting the synovium and articular cartilage that leads to joint damage. Recent reports have suggested the role of adipocytokines in mediating joint damage; however it still is a matter of debate. The purpose of this study was to evaluate the association between serum values of adiopocytokines (leptin, visfatin) and radiographic joint damage in patients with RA.
Materials and Methods:
Fifty-four patients diagnosed with RA, based on Revised ACR Criteria 2010, with 1-5 year disease duration since diagnosis, were enrolled. Twenty-nine of patients had erosion in radiographic studies and 25patients had no erosion. Radiographic joint damages were defined according to Larsen Score. Additionally, serum levels of adipocytokines were measured and cross-sectional associations with radiographic damage were explored, adjusting for pertinent confounders.
Results:
The serum level of visfatin were significantly higher in patients with radiographic joint damage compared with patients with no joint damage (P=0.013). This difference remained significant after adjustment for C-reactive protein levels (P=0.008), but not after adjustment for disease duration (P=0.247). The mean leptin serum levels were not different between these two groups (P=0.903). There was a positive correlation between leptin levels and BMI (r=0.494, P<0.001). However, after adjustment for BMI, leptin levels had no difference between two groups (P=0.508).
Conclusion:
This study revealed that visfatin levels were significantly higher in patients with radiographic joint damage dependently to disease duration. Therefore, it seems that adipocytokine may be a valuable factor in therapeutic targets in the future.
PMCID: PMC4322149  PMID: 25691942
Adipocytokine; Rheumatoid arthritis; Leptin; Larsen score; Visfatin

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