Publications by authors named "Macdonald G"

Juniperus spp. are keystone shrubs in western North America and important climatic indicators in paleo-records. However, a lack of taxonomic resolution among fossil species limits our ability to track past environmental changes.

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Introduction: The GENCOV study sought to evaluate serological differences between individuals with differing COVID-19 severity and outcomes. We assessed the SARS-CoV-2 antibody response of GENCOV participants cross-sectionally 1-, 6-, and 12-months following COVID-19 diagnosis to identify patient factors associated with more robust and durable humoral immune responses.

Materials And Methods: COVID-19 patients and a control cohort of vaccinated infection-naïve participants were recruited at hospital sites across the Greater Toronto Area in Ontario, Canada.

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  • Myosteatosis, characterized by fat buildup in skeletal muscle, is common among patients referred for liver transplantation (LT) and its effects on physical function and clinical outcomes remain uncertain.
  • In a study involving 237 patients, those with myosteatosis showed increased frailty and poorer physical function compared to those without, but the impact on hospitalization rates and surgical complications was less clear after adjustments.
  • Overall, while myosteatosis is linked to diminished physical abilities, it does not seem to significantly affect the likelihood of receiving a transplant or post-operative complications.
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Background: Digital food records offer efficiencies in collecting and assessing dietary information remotely; however, research into factors impacting their translation into clinical settings is limited.

Methods: The study examined factors that may impact the integration of digital food records into clinical dietetic practice by assessing (1) the source and rate of data errors received, (2) the impact of dietitian-adjusted data on dietary variables and (3) the acceptance of use in a complex chronic condition cohort. Adults from specialist clinics enroled in a randomised controlled feasibility trial participated.

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Primarily perceived as an anti-inflammatory and antimicrobial mediator in mucosa and skin, interleukin-22 (IL-22) has emerged as a pivotal metabolic regulator. Central to IL-22 signaling is its receptor, IL-22RA1. Through IL-22RA1, IL-22 orchestrates glucose homeostasis by modulating insulin secretion, reducing cellular stress in pancreatic islets, promoting beta-cell regeneration, and influencing hepatic glucose and lipid metabolism.

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Being romantically partnered is widely seen as a societal norm, and it has been shown to be positively associated with important life outcomes, such as physical and mental health. However, the percentage of singles is steadily increasing, with more people staying single for life. We used the Survey of Health, Ageing and Retirement in Europe (SHARE; = 77,064, mainly ≥ 50 years, 27 countries) to investigate Big Five personality traits and life satisfaction in lifelong singles compared with ever-partnered individuals.

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  • Patient Initiated Follow-Up (PIFU) is being adopted in the NHS to improve outpatient care by enabling patients to manage their follow-ups, especially in high-demand areas like rheumatology.
  • PIFU has shown similar safety and results compared to traditional methods, while enhancing personalized care and efficiency, potentially reducing patient backlogs.
  • Successful implementation requires careful patient selection, education for both patients and staff, clear operational guidelines, and effective use of digital tools like ePROMs for patient monitoring.
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  • A study on pulmonary rehabilitation (PR) tailored for difficult-to-treat asthma in individuals with a BMI ≥25 kg/m shows positive outcomes immediately after 8 weeks and at one-year follow-up.
  • Out of 92 participants, significant improvements were noted in asthma control, breathlessness levels, and frequency of exacerbations over the study period.
  • Results indicate that those with worse asthma control at the start were more likely to see significant benefits from the PR, whereas baseline BMI did not predict the level of improvement.
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Introduction: Historically, patients recently (≤ 6 months) diagnosed with pulmonary arterial hypertension (PAH; incident) have had poorer survival than those with a longer (> 6 months) time from PAH diagnosis (prevalent). Despite guideline recommendations for initial combination therapy for most patients with PAH, many are initiated and maintained on monotherapy. Real-world evidence to evaluate the benefit of early combination treatment in newly-diagnosed patients is lacking.

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  • Novel genome sequencing (GS) presents new chances to share results with healthy people, leading to a need for effective genetic counseling methods.
  • A study with 466 participants used a genomic counseling model (GCM) that included a digital platform and webinars, showing that knowledge about genetics improved and decisional conflict (uncertainty in decision-making) decreased after the counseling.
  • Most participants (86%) wanted to learn all GS findings after the counseling, indicating that the GCM effectively informed the general public and helped them feel more confident in decisions about genetic information.
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Background: Evidence-based guidelines (EBGs) in the nutrition management of advanced liver disease and enhanced recovery after surgery recommendations state that normal diet should recommence 12-24 h following liver transplantation. This study aimed to compare postoperative nutrition practices to guideline recommendations, explore clinician perceptions regarding feeding after transplant surgery, and implement and evaluate strategies to improve postoperative nutrition practices.

Methods: A pre-post multimethod implementation study was undertaken, guided by the knowledge-to-action framework.

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Background: Diet and exercise are important components of treatment for complex chronic conditions, however access to allied health support is limited. When available, support is often siloed and fragmented. Digital health incorporating patient choice may help to align health care services with preferences and goals.

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Background: Heart failure with reduced ejection fraction (HFrEF) is a progressive disease with high rates of hospitalization and mortality. The Canadian Cardiovascular Society recommends treating patients with HFrEF with medications from 4 standard medication classes-this is known as guideline-directed medical therapy (GDMT). However, despite clear evidence and recommendations, GDMT agents are known to be underutilized in the HFrEF population.

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Climate change is an existential threat to the environmental and socioeconomic sustainability of the coastal zone and impacts will be complex and widespread. Evidence from California and across the United States shows that climate change is impacting coastal communities and challenging managers with a plethora of stressors already present. Widespread action could be taken that would sustain California's coastal ecosystems and communities.

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Empathic accuracy-the ability to decipher others' thoughts and feelings-promotes relationship satisfaction. Those high in attachment avoidance tend to be less empathically accurate; however, past research has been limited to relatively negative or neutral contexts. We extend work on attachment and empathic accuracy to the positive context of love.

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Aims: According to current guidelines, initial monotherapy should be considered for pulmonary arterial hypertension (PAH) patients with cardiopulmonary comorbidities. This analysis of combined data from the TRITON and REPAIR clinical trials, assesses efficacy and safety of initial double combination therapy in patients without vs. with 1-2 cardiac comorbidities.

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Introduction: Competence committees (CCs) centre their work around documentation of trainees' performance; undocumented contributions (i.e. informal, unrecorded material like personal judgements, experiential anecdotes and contextual information) evoke suspicion even though they may play a role in decision making.

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Background: Rates of alcohol consumption and obesity are increasing in many Western populations. For some cancer types, both heavy alcohol consumption and obesity are independently associated with increased risk. Whether combined exposure to both synergistically increases an individual's risk of cancer is unclear.

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Objective: The acceptability of being offered a choice from a suite of digital health service options to support optimal diet and exercise behaviors in adults with complex chronic conditions was evaluated. This study sought to understand many areas of acceptability including satisfaction, ease of use, usefulness and user appropriateness and perceived effectiveness.

Methods: This mixed-methods study was embedded within a randomized-controlled feasibility trial providing digital health services managing diet and exercise for adults from specialist kidney and liver disease clinics.

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Young people who transition to adulthood from out-of-home care (OOHC) are more likely to experience a range of poorer outcomes relative to their same-age peers in the community. This systematic review assessed the effectiveness of policies or interventions (hereafter "interventions") aimed at improving housing, health, education, economic, and psychosocial outcomes for youth leaving OOHC (hereafter "care leavers"). Eleven databases of published literature were reviewed along with gray literature.

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  • First Nations populations face significant health disparities, particularly in colorectal cancer (CRC) survival rates compared to non-First Nations groups, with screening rates insufficiently documented.
  • A systematic literature search involved analyzing studies on CRC screening rates from various First Nations populations globally, leading to the inclusion of 57 relevant studies from countries like the US, Australia, and Canada.
  • Wide variations were found in screening participation rates across different countries, highlighting the need for improved understanding and strategies for CRC screening among First Nations populations.
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  • The IL-22RA1 receptor is important in the pancreas and helps improve insulin secretion from beta-cells while reducing cellular stress.
  • Blocking IL-22RA1 in human pancreatic islets results in lower insulin quality and increased cellular stress, indicating its crucial role in insulin regulation.
  • Experiments in mice lacking IL-22ra1 in beta-cells showed similar negative effects on insulin secretion, increased inflammation, and worsened glucose tolerance, especially in females, highlighting the receptor's significance in metabolic health.
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Metabolic dysfunction-associated steatohepatitis (MASH) is the most prevalent cause of liver disease worldwide, with a single approved therapeutic. Previous research has shown that interleukin-22 (IL-22) can suppress β-cell stress, reduce local islet inflammation, restore appropriate insulin production, reverse hyperglycemia, and ameliorate insulin resistance in preclinical models of diabetes. In clinical trials long-acting forms of IL-22 have led to increased proliferation in the skin and intestine, where the IL-22RA1 receptor is highly expressed.

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Exercise interventions positively affect numerous cardiometabolic risk factors. To better evaluate the health effects of exercise training, it may be more appropriate to evaluate risk factors together. The Metabolic Syndrome Severity Score (MetSSS) is a composite score representing cardiometabolic risk.

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