McMaster University

About: McMaster University is a education organization based out in Hamilton, Ontario, Canada. It is known for research contribution in the topics: Population & Health care. The organization has 41361 authors who have published 101269 publications receiving 4251422 citations.

Effectiveness and safety of bronchial thermoplasty in the treatment of severe asthma: A multicenter, randomized, double-blind, sham-controlled clinical trial

Abstract: RATIONALE: Bronchial thermoplasty (BT) is a bronchoscopic procedure in which controlled thermal energy is applied to the airway wall to decrease smooth muscle. OBJECTIVES: To evaluate the effectiveness and safety of BT versus a sham procedure in subjects with severe asthma who remain symptomatic despite treatment with high-dose inhaled corticosteroids and long-acting beta(2)-agonists. METHODS: A total of 288 adult subjects (Intent-to-Treat [ITT]) randomized to BT or sham control underwent three bronchoscopy procedures. Primary outcome was the difference in Asthma Quality of Life Questionnaire (AQLQ) scores from baseline to average of 6, 9, and 12 months (integrated AQLQ). Adverse events and health care use were collected to assess safety. Statistical design and analysis of the primary endpoint was Bayesian. Target posterior probability of superiority (PPS) of BT over sham was 95%, except for the primary endpoint (96.4%). MEASUREMENTS AND MAIN RESULTS: The improvement from baseline in the integrated AQLQ score was superior in the BT group compared with sham (BT, 1.35 +/- 1.10; sham, 1.16 +/- 1.23 [PPS, 96.0% ITT and 97.9% per protocol]). Seventy-nine percent of BT and 64% of sham subjects achieved changes in AQLQ of 0.5 or greater (PPS, 99.6%). Six percent more BT subjects were hospitalized in the treatment period (up to 6 wk after BT). In the posttreatment period (6-52 wk after BT), the BT group experienced fewer severe exacerbations, emergency department (ED) visits, and days missed from work/school compared with the sham group (PPS, 95.5, 99.9, and 99.3%, respectively). CONCLUSIONS: BT in subjects with severe asthma improves asthma-specific quality of life with a reduction in severe exacerbations and healthcare use in the posttreatment period. Clinical trial registered with www.clinialtrials.gov (NCT00231114).

Mode of action of nintedanib in the treatment of idiopathic pulmonary fibrosis

Abstract: Idiopathic pulmonary fibrosis (IPF) is a progressive and ultimately fatal disease characterised by fibrosis of the lung parenchyma and loss of lung function. Although the pathogenic pathways involved in IPF have not been fully elucidated, IPF is believed to be caused by repetitive alveolar epithelial cell injury and dysregulated repair, in which there is uncontrolled proliferation of lung fibroblasts and differentiation of fibroblasts into myofibroblasts, which excessively deposit extracellular matrix (ECM) proteins in the interstitial space. A number of profibrotic mediators including platelet-derived growth factor (PDGF), fibroblast growth factor (FGF) and transforming growth factor-β are believed to play important roles in the pathogenesis of IPF. Nintedanib is a potent small molecule inhibitor of the receptor tyrosine kinases PDGF receptor, FGF receptor and vascular endothelial growth factor receptor. Data from in vitro studies have shown that nintedanib interferes with processes active in fibrosis such as fibroblast proliferation, migration and differentiation, and the secretion of ECM. In addition, nintedanib has shown consistent anti-fibrotic and anti-inflammatory activity in animal models of lung fibrosis. These data provide a strong rationale for the clinical efficacy of nintedanib in patients with IPF, which has recently been demonstrated in phase III clinical trials.

The burden of schizophrenia on caregivers: a review.

Abstract: Schizophrenia is a disabling, chronic psychiatric disorder that poses numerous challenges in its management and consequences. It extols a significant cost to the patient in terms of personal suffering, on the caregiver as a result of the shift of burden of care from hospital to families, and on society at large in terms of significant direct and indirect costs that include frequent hospitalizations and the need for long-term psychosocial and economic support, as well as life-time lost productivity. ‘Burden of care’ is a complex construct that challenges simple definition, and is frequently criticized for being broad and generally negative. Frequently, burden of care is more defined by its impacts and consequences on caregivers. In addition to the emotional, psychological, physical and economic impact, the concept of ‘burden of care’ involves subtle but distressing notions such as shame, embarrassment, feelings of guilt and self-blame. The early conceptualization of ‘burden of care’ into two distinct components (objective and subjective) has guided research efforts until the present time. Objective burden of care is meant to indicate its effects on the household such as taking care of daily tasks, whereas subjective burden indicates the extent to which the caregivers perceive the burden of care. Research contributions in later years (1980s to the present) have added more depth to understanding of the construct of burden of care by exploring important determinants and factors that likely contribute or mediate the caregiver’s perception of burden of care. Several studies examined the role of gender, and reported that relatives of male patients with schizophrenia frequently experience more social dysfunction and disabilities than those of female patients. Similarly, a number of other studies documented the contribution of ethnicity and cultural issues to subjective burden of care. Although there is no complete agreement on whether a specific cluster of psychotic symptoms has the most impact on a caregiver’s burden of care, there is agreement that the severity of symptoms increases it. An extensive literature concerning family interventions in schizophrenia has demonstrated the positive impact of various family interventions in improving family environment, reducing relapse and easing the burden of care. Although the evidence of such positive impact of family interventions in schizophrenia is well documented, such interventions are neither widely used nor appropriately integrated in care plans, and are frequently underfunded. Although the cost of caregiving is considered to be significant, there are no reliable estimates of the costs associated with such care. The majority of available literature categorized the cost of burden of care among the indirect costs of schizophrenia in general. In recent years, attempts to compare the costs of caregiving in several countries have been reported in the evolving literature on this topic. ‘Burden of care’ as a complex construct certainly requires the development of appropriate methodology for its costing. In achieving a balance between the patients’ and caregivers’ perspectives, caregivers have to be included in the care plan and adequate information and support extended to the family and caregivers. Access to better treatment for patients, including medications, psychosocial interventions and rehabilitation services, are important basic elements in easing the burden on caregivers. Other measures such as availability of crisis management, provision of legally mandated community treatment to avert hospitalization, and well informed and balanced advocacy are also important. Although research efforts have been expanded in the last 3 decades, an urgent need exists for enhancing such efforts, particularly in the development and evaluation of effective family interventions strategies. There is also a need for continued improvement in the delivery of psychiatric services to the severely psychiatrically ill and their families. As there is a lack of reliable cost information about the family burden of care specific to schizophrenia, there is an urgent need to develop reliable approaches that can generate data that can inform in policy making and organization of services.

On implementing a primal-dual interior-point method for conic quadratic optimization

Abstract: Based on the work of the Nesterov and Todd on self-scaled cones an implementation of a primal-dual interior-point method for solving large-scale sparse conic quadratic optimization problems is presented. The main features of the implementation are it is based on a homogeneous and self-dual model, it handles rotated quadratic cones directly, it employs a Mehrotra type predictor-corrector extension and sparse linear algebra to improve the computational efficiency. Finally, the implementation exploits fixed variables which naturally occurs in many conic quadratic optimization problems. This is a novel feature for our implementation. Computational results are also presented to document that the implementation can solve very large problems robustly and efficiently.