Subtherapeutic concentrations of posaconazole tablet: determining risk factors and effectiveness of a standardized dose adjustment in hematology inpatients.

Posaconazole is indicated for antifungal prophylaxis in hematology patients at high-risk of invasive fungal infections (IFI). Consensus guidelines recommend maintaining steady-state trough concentrations above 0.7 mg/L; however, upto one-third of patients return subtherapeutic concentrations which is associated with breakthrough IFI.

Increased myelination plays a central role in white matter neuroplasticity.

White matter (WM) neuroplasticity in the human brain has been tracked non-invasively using advanced magnetic resonance imaging techniques, with increasing evidence for improved axonal transmission efficiency as a central mechanism. The current study is the culmination of a series of studies, which characterized the structure-function relationship of WM transmission efficiency in the cortico-spinal tract (CST) during motor learning. Here, we test the hypothesis that increased transmission efficiency is linked directly to increased myelination using myelin water imaging (MWI).

Characterization of Risk Factors for Calciphylaxis in Hemodialysis Patients in the Fraser Health Renal Program - A Matched Case-Control Retrospective Review.

Calciphylaxis is a lethal and rare disease characterized by ischemic and necrotic skin lesions caused by vascular calcification of adipose tissue. There have been many risk factors analyzed in the literature; however, the pathogenesis of calciphylaxis is still not well understood and treatment options are limited due to the lack of interventional studies. Our objectives were to describe risk factors, prevalence, incidence, and outcomes for calciphylaxis in hemodialysis patients within the Fraser Health Renal Program.

Waning Immunity Against Respiratory Syncytial Virus During the Coronavirus Disease 2019 Pandemic.

Health jurisdictions have seen a near-disappearance of respiratory syncytial virus (RSV) during the first year of the coronavirus disease 2019 (COVID-19) pandemic. Over this corresponding period, we report a reduction in RSV antibody levels and live virus neutralization in sera from women of childbearing age and infants between May to June 2020 and February to June 2021, in British Columbia (BC), Canada. This supports that antibody immunity against RSV is relatively short-lived and that maintaining optimal antibody levels in infants requires repeated maternal viral exposure.

Current Practices in and Barriers to Physiotherapists' Use of Resistance Exercise with Older Adults in Acute Care.

The purpose of this cross-sectional study was to describe physiotherapists' current use of resistance exercise (REx) with older adults in acute care and to identify barriers to its use with this population. We developed an online questionnaire guided by the theoretical domains framework and distributed it to physiotherapists across British Columbia. We used thematic analysis to code open-text questionnaire responses.

Organ dysfunction and death in patients admitted to hospital with COVID-19 in pandemic waves 1 to 3 in British Columbia, Ontario and Quebec, Canada: a cohort study.

Background: There have been multiple waves in the COVID-19 pandemic in many countries. We sought to compare mortality and respiratory, cardiovascular and renal dysfunction between waves in 3 Canadian provinces.

Methods: We conducted a substudy of the ARBs CORONA I study, a multicentre Canadian pragmatic observational cohort study that examined the association of pre-existing use of angiotensin receptor blockers with outcomes in adults admitted to hospital with acute COVID-19 up to April 2021 from 9 community and teaching hospitals in 3 Canadian provinces (British Columbia, Ontario and Quebec).

Age-Associated Seroprevalence of Coronavirus Antibodies: Population-Based Serosurveys in 2013 and 2020, British Columbia, Canada.

Background: Older adults have been disproportionately affected during the SARS-CoV-2 pandemic, including higher risk of severe disease and long-COVID. Prior exposure to endemic human coronaviruses (HCoV) may modulate the response to SARS-CoV-2 infection and contribute to age-related observations. We hypothesized that cross-reactive antibodies to SARS-CoV-2 are associated with antibodies to HCoV and that both increase with age.

The mental health impact of the COVID-19 pandemic on Canadian critical care nurses.

Objective: Focusing on Canadian critical care nurses (CCNs), the study objectives were to examine the impact of the COVID-19 pandemic on: mental health, quality of work life, and intent to stay in their current positions.

Research Design: Mixed-methods study using an online cross-sectional survey and integration of closed- and open-ended survey data.

Setting: Canadian CCNs working in an intensive care unit, high acuity unit, or intensive care step-down unit during the COVID-19 pandemic between May 2021 to June 2021.

Ambulatory Heart Function and Transplant Patients' Perceptions of Drug-Drug Interactions: A Qualitative Study.

Background: Drug-drug interactions (DDIs) can cause adverse drug events, leading to hospitalizations and an increase in the risk of morbidity and mortality. Until now, patients' perceptions of DDIs have represented an understudied area of research.

Objectives: To explore patients' perceptions of DDIs and identify factors important to patients' understanding of their medications.

Artificial intelligence in brain MRI analysis of Alzheimer's disease over the past 12 years: A systematic review.

Introduction: Multiple structural brain changes in Alzheimer's disease (AD) and mild cognitive impairment (MCI) have been revealed on magnetic resonance imaging (MRI). There is a fast-growing effort in applying artificial intelligence (AI) to analyze these data. Here, we review and evaluate the AI studies in brain MRI analysis with synthesis.

Promoting early management of frailty in the new normal: An updated software tool in addressing the need of virtual assessment of frailty at points of care.

Introduction: Frailty is a state of diminished physiological reserve and can be assessed using the frailty index. Early management of frailty is crucial for preventing adverse outcomes. Intended for assessing home-living older adults, the initial release of the eFI-CGA software was prior to the coronavirus disease 2019 (COVID-19) pandemic.

Functional MRI evaluation of cognitive effects of carotid stenosis revascularization.

Introduction: Severe internal carotid stenosis, if left untreated, can pose serious risks for ischemic stroke and cognitive impairments. The effects of revascularization on any aspects of cognition, however, are not well understood, as conflicting results are reported, which have mainly been centered on paper-based cognitive analyses. Here, we summarized and evaluated the publications to date of functional MRI (fMRI) studies that examined the mechanisms of functional brain activation and connectivity as a way to reflect cognitive effects of revascularization on patients with carotid stenosis.

Longitudinal Plasma Proteomics Analysis Reveals Novel Candidate Biomarkers in Acute COVID-19.

The host response to COVID-19 pathophysiology over the first few days of infection remains largely unclear, especially the mechanisms in the blood compartment. We report on a longitudinal proteomic analysis of acute-phase COVID-19 patients, for which we used blood plasma, multiple reaction monitoring with internal standards, and data-independent acquisition. We measured samples on admission for 49 patients, of which 21 had additional samples on days 2, 4, 7, and 14 after admission.

Brainstem Abnormalities in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: A Scoping Review and Evaluation of Magnetic Resonance Imaging Findings.

Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a multisystem medical condition with heterogeneous symptom expression. Currently, there is no effective cure or treatment for the standard care of patients. A variety of ME/CFS symptoms can be linked to the vital life functions of the brainstem, the lower extension of the brain best known as the hub relaying information back and forth between the cerebral cortex and various parts of the body.

Web-based software applications for frailty assessment in older adults: a scoping review of current status with insights into future development.

Background: A crucial aspect of continued senior care is the early detection and management of frailty. Developing reliable and secure electronic frailty assessment tools can benefit virtual appointments, a need especially relevant in the context of the COVID-19 pandemic. An emerging effort has targeted web-based software applications to improve accessibility and usage.

Imaging functional neuroplasticity in human white matter tracts.

Magnetic resonance imaging (MRI) studies are sensitive to biological mechanisms of neuroplasticity in white matter (WM). In particular, diffusion tensor imaging (DTI) has been used to investigate structural changes. Historically, functional MRI (fMRI) neuroplasticity studies have been restricted to gray matter, as fMRI studies have only recently expanded to WM.

Event Related Potential Signal Capture Can Be Enhanced through Dynamic SNR-Weighted Channel Pooling.

Background: Electroencephalography (EEG)-derived event-related potentials (ERPs) provide information about a variety of brain functions, but often suffer from low inherent signal-to-noise ratio (SNR). To overcome the low SNR, techniques that pool data from multiple sensors have been applied. However, such pooling implicitly assumes that the SNR among sensors is equal, which is not necessarily valid.

Interference of ketone bodies on laboratory creatinine measurement in children with DKA: a call for change in testing practices.

Background: The presence of ketone bodies (KBs) can interfere with creatinine (Cr) measurement in both enzymatic and Jaffe methods. Since a high proportion of children hospitalized for diabetic ketoacidosis (DKA) develop acute kidney injury (AKI), here we investigate whether KB interferences affect the accuracy of pediatric Cr measurement.

Methods: Residual patient plasma samples were pooled to make three Cr levels (~ 50, 100, and 250 μM).