Publications by authors named "Dana Dawson"

Aims: We investigate sex disparities in management and outcomes of myocardial infarction (MI) in contemporary practice in Scotland.

Methods And Results: This was a longitudinal cohort study including all MI admissions aged 45-80 years across Scotland between 2010-2016 and 2:1 age, sex, and general practice-matched general population controls. Participants were followed up until the end of 2021.

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Importance: Development of myocardial fibrosis in patients with aortic stenosis precedes left ventricular decompensation and is associated with an adverse long-term prognosis.

Objective: To investigate whether early valve intervention reduced the incidence of all-cause death or unplanned aortic stenosis-related hospitalization in asymptomatic patients with severe aortic stenosis and myocardial fibrosis.

Design, Setting, And Participants: This prospective, randomized, open-label, masked end point trial was conducted between August 2017 and October 2022 at 24 cardiac centers across the UK and Australia.

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Article Synopsis
  • Hypertrophic cardiomyopathy (HCM) is a diverse heart condition that can lead to severe health issues and traditionally managed through symptom relief and the use of defibrillators to prevent sudden cardiac death.
  • There is a recognized need for treatments that modify the disease itself, and recently, new therapies like mavacamten, a myosin inhibitor, have gained regulatory approval.
  • Clinical trials for HCM face unique challenges, which include selecting patients based on their genetic and symptom profiles, measuring outcomes effectively, and considering factors like trial duration and sample size when interpreting results.
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Article Synopsis
  • The study examined the effects of myocardial injury in hospitalized COVID-19 survivors who had elevated troponin levels, using cardiac imaging and tracking health-related quality of life over 12 months.* -
  • Conducted in 25 UK centers, the research involved 342 participants, finding that while some cardiovascular events occurred, overall major adverse outcomes were low after 12 months.* -
  • Results showed slight improvements in heart function and quality of life after 6 months, with no evidence of ongoing myocardial inflammation or progression of heart injury.*
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Introduction: There are sex differences in the extent, severity, and outcomes of coronary artery disease. We aimed to assess the influence of sex on coronary atherosclerotic plaque activity measured using coronary F-sodium fluoride (F-NaF) positron emission tomography (PET), and to determine whether F-NaF PET has prognostic value in both women and men.

Methods: In a post-hoc analysis of observational cohort studies of patients with coronary atherosclerosis who had undergone F-NaF PET CT angiography, we compared the coronary microcalcification activity (CMA) in women and men.

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Aims: With an ageing population, the presence of asymptomatic valvular heart disease (VHD) in the community remains unknown. The aim of this study is to determine the prevalence and associated factors of asymptomatic VHD in individuals ≥60 years old and to evaluate the feasibility of echocardiographic screening for VHD in this population.

Methods And Results: This was a prospective cohort study conducted between 2007 and 2016 in the UK.

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Cardiovascular disease (CVD) is the leading cause of morbimortality in Europe and worldwide. CVD imposes a heterogeneous spectrum of cardiac remodelling, depending on the insult nature, that is, pressure or volume overload, ischaemia, arrhythmias, infection, pathogenic gene variant, or cardiotoxicity. Moreover, the progression of CVD-induced remodelling is influenced by sex, age, genetic background and comorbidities, impacting patients' outcomes and prognosis.

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Background: Total coronary atherosclerotic plaque activity across the entire coronary arterial tree is associated with patient-level clinical outcomes.

Objectives: We aimed to investigate whether vessel-level coronary atherosclerotic plaque activity is associated with vessel-level myocardial infarction.

Methods: In this secondary analysis of an international multicenter study of patients with recent myocardial infarction and multivessel coronary artery disease, we assessed vessel-level coronary atherosclerotic plaque activity using coronary F-sodium fluoride positron emission tomography to identify vessel-level myocardial infarction.

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Background: Takotsubo syndrome is an increasingly common cardiac emergency with no known evidence-based treatment.

Objectives: The purpose of this study was to investigate cardiovascular mortality and medication use after takotsubo syndrome.

Methods: In a case-control study, all patients with takotsubo syndrome in Scotland between 2010 and 2017 (n = 620) were age, sex, and geographically matched to individuals in the general population (1:4, n = 2,480) and contemporaneous patients with acute myocardial infarction (1:1, n = 620).

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Despite opposing insulin sensitivity and cardiometabolic risk, both athletes and patients with type 2 diabetes have increased skeletal myocyte fat storage: the so-called "athlete's paradox". In a parallel non-randomised, non-blinded trial (NCT03065140), we characterised and compared the skeletal myocyte lipid signature of 29 male endurance athletes and 30 patients with diabetes after undergoing deconditioning or endurance training respectively. The primary outcomes were to assess intramyocellular lipid storage of the vastus lateralis in both cohorts and the secondary outcomes were to examine saturated and unsaturated intramyocellular lipid pool turnover.

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Aims: Better understanding of sex differences in cardiovascular disease (CVD) is essential in tailoring appropriate preventative strategies. Using a large population-based study with follow-up >25 years, we aimed to determine sex-specific lifetime risks of incident CVD and cardiovascular (CV) mortality amongst populations with and without prevalent CVD.

Methods And Results: Participants were drawn from the European Prospective Investigation into Cancer-Norfolk and followed up for a median of 26.

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Mitral valve function depends on its complex geometry and tissue health, with alterations in shape and tissue response affecting the long-term restorarion of function. Previous computational frameworks for biomechanical assessment are mostly based on patient-specific geometries; however, these are not flexible enough to yield a variety of models and assess mitral closure for individually tuned morphological parameters or material property representations. This study details the finite element approach implemented in our previously developed toolbox to assess mitral valve biomechanics and showcases its flexibility through the generation and biomechanical evaluation of different models.

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While chronic heart failure (CHF) treatment has considerably improved patient prognosis and survival, the therapeutic management of acute heart failure (AHF) has remained virtually unchanged in the last decades. This is partly due to the scarcity of pre-clinical models for the pathophysiological assessment and, consequently, the limited knowledge of molecular mechanisms involved in the different AHF phenotypes. This scientific statement outlines the different trajectories from acute to CHF originating from the interaction between aetiology, genetic and environmental factors, and comorbidities.

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Background: Anthracycline-related cardiac toxicity is a recognized consequence of cancer therapies. We assess resting cardiac and skeletal muscle energetics and myocyte, sarcomere, and mitochondrial integrity in patients with breast cancer receiving epirubicin.

Methods: In a prospective, mechanistic, observational, longitudinal study, we investigated chemotherapy-naive patients with breast cancer receiving epirubicin versus sex- and age-matched healthy controls.

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Background And Aims: The epidemiology of peripartum cardiomyopathy (PPCM) in Europe is poorly understood and data on long-term outcomes are lacking. A retrospective, observational, population-level study of validated cases of PPCM in Scotland from 1998 to 2017 was conducted.

Methods: Women hospitalized with presumed de novo left ventricular systolic dysfunction around the time of pregnancy and no clear alternative cause were included.

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Article Synopsis
  • The study aimed to analyze the effects of diabetes on cardiac remodelling and exercise capacity in patients with aortic stenosis (AS).
  • It found that while diabetes patients had similar heart volumes and function compared to non-diabetic patients, they exhibited worse exercise capacity and higher levels of certain biomarkers.
  • Importantly, diabetes did not significantly increase cardiovascular events, but it was linked to a higher risk of all-cause mortality, highlighting its need for careful management in AS patients.
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Takotsubo syndrome (TTS) is an acute heart failure syndrome that mimics the symptoms of acute myocardial infarction and is often preceded by emotional and/or physical stress. There is currently no treatment for TTS. Here we show that injection of 2.

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Importance: Recurrent coronary events in patients with recent myocardial infarction remain a major clinical problem. Noninvasive measures of coronary atherosclerotic disease activity have the potential to identify individuals at greatest risk.

Objective: To assess whether coronary atherosclerotic plaque activity as assessed by noninvasive imaging is associated with recurrent coronary events in patients with myocardial infarction.

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Background: Takotsubo syndrome mimics an acute myocardial infarction, typically in the aftermath of mental or physical stress.

Objectives: The mechanism by which emotional processing in the context of stress leads to significant cardiac injury is poorly understood, so a full exploration of brain structure and function in takotsubo syndrome patients merits investigation.

Methods: Twenty-five acute (<5 days) takotsubo patients and 25 control subjects were recruited into this observational cross-sectional study.

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Background: Acute myocardial injury in hospitalized patients with coronavirus disease 2019 (COVID-19) has a poor prognosis. Its associations and pathogenesis are unclear. Our aim was to assess the presence, nature, and extent of myocardial damage in hospitalized patients with troponin elevation.

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Background: Takotsubo syndrome is an acute cardiac emergency characterized by transient left ventricular systolic dysfunction typically following a stressful event. Despite its rapidly rising incidence, its pathophysiology remains poorly understood. Takotsubo syndrome may pass unrecognized, especially if timely diagnostic imaging is not performed.

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Background We investigate if renin-angiotensin and endothelin-1 response pathways follow the same pattern of recovery as left ventricular ejection fraction in patients with takotsubo cardiomyopathy. Methods and Results Ninety patients with takotsubo cardiomyopathy (n=30 in each of "acute," "convalescent" [3-5 months] and "recovered" [>1 year] groups) who were on minimal or no medication and were free of any significant cardiac/metabolic comorbidities, and 30 controls were studied. Serum concentrations of renin, angiotensin-converting enzyme, angiotensin II, big endothelin-1, endothelin-1 were measured using commercially available ELISA, and B-type natriuretic peptide was measured using an immunoassay.

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Autoimmune rheumatic diseases (ARDs) involve multiple organs including the heart and vasculature. Despite novel treatments, patients with ARDs still experience a reduced life expectancy, partly caused by the higher prevalence of cardiovascular disease (CVD). This includes CV inflammation, rhythm disturbances, perfusion abnormalities (ischaemia/infarction), dysregulation of vasoreactivity, myocardial fibrosis, coagulation abnormalities, pulmonary hypertension, valvular disease, and side-effects of immunomodulatory therapy.

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