Publications by authors named "Martin O'Donnell"

Background And Objectives: Despite effective secondary prevention, including oral anticoagulant (OAC) therapy, the risk of recurrent stroke (RS) in patients with atrial fibrillation (AF) remains substantial with an annualized risk of 3.2%-6.5% per year.

View Article and Find Full Text PDF
Article Synopsis
  • Clinicians often prefer antiplatelet therapy over direct oral anticoagulants (DOACs) for atrial fibrillation due to concerns about higher risks of intracranial bleeding despite DOACs being more effective in preventing strokes.
  • The study aimed to compare the risks of intracranial and major hemorrhage between DOAC therapy and single-agent antiplatelet therapy using data from nine randomized clinical trials with nearly 45,500 participants.
  • Results showed no significant difference in the risk of intracranial hemorrhage between the two therapies; however, the analysis indicated variability in results among different DOACs, with rivarox
View Article and Find Full Text PDF

Background: Despite secondary prevention with aspirin, patients with stable cardiovascular disease (CVD) remain at elevated long-term risk of major adverse cardiovascular events. The Cardiovascular Outcomes in People Using Anticoagulant Strategies (COMPASS) double-blind, randomized clinical trial demonstrated that aspirin plus low-dose rivaroxaban (COMPASS regime) significantly decreased the incidence of major adverse cardiovascular events by 24% compared with aspirin alone. However, the mechanisms underlying these potential synergistic/nonantithrombotic effects remain elusive.

View Article and Find Full Text PDF

Background: The Mini-Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA) questionnaires are commonly used to measure global cognition in clinical trials. Because these scales are discrete and bounded with ceiling and floor effects and highly skewed, their analysis as continuous outcomes presents challenges. Normality assumptions of linear regression models are usually violated, which may result in failure to detect associations with variables of interest.

View Article and Find Full Text PDF

Background And Purpose: Cold beverage intake (carbonated drinks, fruit juice/drinks, and water) may be important population-level exposures relevant to stroke risk and prevention. We sought to explore the association between intake of these beverages and stroke.

Methods: INTERSTROKE is an international matched case-control study of first stroke.

View Article and Find Full Text PDF

Aims/hypothesis: Gestational diabetes mellitus (GDM) is associated with adverse perinatal outcomes because of suboptimal glucose management and glucose control and excessive weight gain. Metformin can offset these factors but is associated with small for gestational age (SGA) infants. We sought to identify risk factors for SGA infants, including the effect of metformin exposure on SGA status.

View Article and Find Full Text PDF

Traditional medical artificial intelligence models that are approved for clinical use restrict themselves to single-modal data ( e.g ., images only), limiting their applicability in the complex, multimodal environment of medical diagnosis and treatment.

View Article and Find Full Text PDF
Article Synopsis
  • The study aims to investigate the prevalence of activity limitations and the use of assistive devices across 25 countries with varying economic statuses, focusing on how these limitations correlate with negative health outcomes.
  • Researchers analyzed data from the Prospective Urban Rural Epidemiological (PURE) study, which involved over 175,000 participants aged 35-70, looking specifically at self-reported difficulties in daily functions, as well as demographic factors.
  • The findings highlight a gap in understanding the relationship between activity limitations and mortality or clinical events, revealing the need for more comprehensive studies on how such limitations impact health across different populations.
View Article and Find Full Text PDF

Aim: Women with GDM display adverse lifetime cardio-metabolic health. We examined whether early metformin in GDM could impact cardio-metabolic risk factors postpartum.

Research Design & Methods: EMERGE, a double-blind, placebo-controlled trial randomized pregnancies 1:1 to placebo or metformin at GDM diagnosis and followed participants from randomization until 12±4 weeks postpartum.

View Article and Find Full Text PDF

Objectives: There is conflicting evidence regarding the outcomes of acute stroke patients who present to hospital within normal working hours ('in-hours') compared with the 'out-of-hours' period. This study aimed to assess the effect of time of stroke presentation on outcomes within the Irish context, to inform national stroke service delivery.

Materials And Methods: A secondary analysis of data from the Irish National Audit of Stroke (INAS) from Jan 2016 to Dec 2019 was carried out.

View Article and Find Full Text PDF

Background: Stroke is a leading global cause of death and disability. Daily tea/coffee intake is consumed by > 50% of populations and may represent an important population-level exposure. Therefore, it is first essential that we better understand the associations between the tea/coffee intake and stroke.

View Article and Find Full Text PDF

Background: Anti-inflammatory therapy with long-term colchicine prevented vascular recurrence in coronary disease. Unlike coronary disease, which is typically caused by atherosclerosis, ischaemic stroke is caused by diverse mechanisms including atherosclerosis and small vessel disease or is frequently due to an unknown cause. We aimed to investigate the hypothesis that long-term colchicine would reduce recurrent events after ischaemic stroke.

View Article and Find Full Text PDF

Background: Periodontal disease may be an important modifiable risk factor for stroke.

Aims: To determine the contribution of markers of periodontal disease to stroke risk globally, within subpopulations, and by stroke subtypes.

Methods: INTERSTROKE is the largest international case-control study of risk factors for first acute stroke.

View Article and Find Full Text PDF
Article Synopsis
  • Cognitive decline is a major concern with aging, linked to higher risks of dementia and stroke, though the exact causes are unclear.
  • A study of 1160 proteins in plasma found five that are associated with cognitive function, specifically in a test called DSST, with two proteins (NCAN and CDCP1) showing consistent results in a follow-up group.
  • The research indicates that some proteins may influence brain health and stroke risk, suggesting avenues for future research and potential drug treatments to help mitigate cognitive decline and related risks.
View Article and Find Full Text PDF

Background And Purpose: Blood pressure variability, in acute stroke, may be an important modifiable determinant of functional outcome after stroke. In a large international cohort of participants with acute stroke, it was sought to determine the association of blood pressure variability (in the early period of admission) and functional outcomes, and to explore risk factors for increased blood pressure variability.

Patients And Methods: INTERSTROKE is an international case-control study of risk factors for first acute stroke.

View Article and Find Full Text PDF

Background And Purpose: Whilst sleep disturbances are associated with stroke, their association with stroke severity is less certain. In the INTERSTROKE study, the association of pre-morbid sleep disturbance with stroke severity and functional outcome following stroke was evaluated.

Methods: INTERSTROKE is an international case-control study of first acute stroke.

View Article and Find Full Text PDF

Background: Smoking is a major risk factor for the global burden of stroke. We have previously reported a global population attributable risk (PAR) of stroke of 12.4% associated with current smoking.

View Article and Find Full Text PDF

 Reasons for the relatively poor performance of bleeding prediction models are not well understood but may relate to differences in predictors for various anatomical sites of bleeding.  We pooled individual participant data from four randomized controlled trials of antithrombotic therapy in patients with coronary and peripheral artery diseases, embolic stroke of undetermined source (ESUS), or atrial fibrillation. We examined discrimination and calibration of models for any major bleeding, major gastrointestinal (GI) bleeding, and intracranial hemorrhage (ICH), according to the time since initiation of antithrombotic therapy, and indication for antithrombotic therapy.

View Article and Find Full Text PDF

In 1953, Morton Levin introduced a simple approach to estimating population attributable fractions (PAF) depending only on risk factor prevalence and relative risk. This formula and its extensions are still in widespread use today, particularly to estimate PAF in populations where individual data is unavailable. Unfortunately, Levin's approach is known to be asymptotically biased for the PAF when the risk factor-disease relationship is confounded even if relative risks that are correctly adjusted for confounding are used in the estimator.

View Article and Find Full Text PDF

Background: Survivors of stroke are often concerned about cognitive problems, and information on the risk of cognitive problems often comes from small studies. We aimed to estimate years of cognitive ageing associated with stroke compared with transient ischaemic attack, myocardial infarction, and other hospitalisations in a large population.

Methods: Using data from six randomised controlled trials (ORIGIN, ONTARGET, TRANSCEND, COMPASS, HOPE-3, and NAVIGATE ESUS), we completed an individual participant data meta-analysis using data requested from the Public Health Research Institute to estimate the association of stroke (by type and severity), transient ischaemic attack, myocardial infarction, and other hospitalisations with cognitive performance measured at the end of each trial.

View Article and Find Full Text PDF

Dietary guidelines recommend intake targets for some essential minerals, based on observational and experimental evidence relating mineral intake levels to health outcomes. For prevention of cardiovascular disease, reducing sodium intake and increasing potassium intake are the principal tools. While reducing sodium intake has received greatest public health priority, emerging evidence suggests that increasing potassium intake may be a more important target for cardiovascular prevention.

View Article and Find Full Text PDF