Publications by authors named "Ambler G"

Introduction: Stroke incidence in younger adults is increasing worldwide yet few comprehensive studies exist from a UK population. We investigated the risk factors, mechanisms, functional outcome and stroke recurrence rate in a cohort of young adults with stroke.

Patients And Methods: We included consecutive patients (<55 years) with ischaemic stroke or intracerebral haemorrhage (ICH) admitted to the University College London Hospitals Hyperacute Stroke Unit between 2017 and 2020.

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Objective: Repetitive transcranial magnetic stimulation (rTMS) is a promising approach in improving swallowing function after stroke. However, comparative efficacy of different rTMS protocols for poststroke dysphagia (PSD) remains unclear.

Data Sources: PubMed, Embase, and Cochrane database were systematically searched for eligible random controlled trials (RCTs) from inception to August 30, 2024.

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Background: Adverse non-motor outcomes have a major impact on patients and caregivers after stroke, but knowledge of their prevalence, predictors and patterns across multiple health domains remains limited; we therefore aimed to obtain these data in a large observational prospective cohort study.

Methods: We included data from the Stroke Investigation Group in North and Central London (SIGNAL) registry based at the University College London Hospitals (UCLH) Comprehensive Stroke Service which serves a multi-ethnic population of ∼1.6 million people.

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Article Synopsis
  • A significant portion of spontaneous intracerebral hemorrhages (ICH) arise from macrovascular causes, necessitating a swift diagnosis, often through invasive procedures like digital subtraction angiography (DSA), which aren't suitable for all patients.
  • This study aimed to develop a new risk stratification score, the MACRO score, incorporating MRI findings to improve the identification of macrovascular causes of ICH.
  • The MACRO score successfully incorporates various patient factors and MRI markers, demonstrating better predictive capabilities than current CT-based scores, validating its effectiveness in a diverse patient population.
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  • Cerebral small vessel disease (SVD) can lead to various cerebrovascular issues, but research on sex differences in SVD is limited.
  • This study analyzed data from over 20,000 patients with acute ischemic stroke to examine whether the presence and severity of cerebral microbleeds (CMB) and other SVD markers differ between males and females.
  • Results showed that males had more frequent CMB while females had fewer lacunes but higher severe white matter hyperintensities, indicating distinct SVD characteristics based on sex.
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Objective: The first COVID-19 pandemic wave was a period of reduced surgical activity and redistribution of resources to only those with late stage or critical presentations. This Vascular and Endovascular Research Network COVID-19 Vascular Service (COVER) study aimed to describe the six-month outcomes of patients who underwent open surgery and or endovascular interventions for major vascular conditions during this period.

Methods: In this international, multicentre, prospective, observational study, centres recruited consecutive patients undergoing vascular procedures over a 12-week period.

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Objective: To determine the efficacy of advanced hybrid closed-loop (AHCL) therapy in a high-risk cohort of youth on continuous subcutaneous insulin infusion (CSII) with or without continuous glucose monitoring (CGM) with suboptimal glycemia.

Research Design And Methods: In a 6-month multicenter clinical trial, youth with type 1 diabetes with mean and most recent HbA1c >8.5% (65 mmol/mol) were randomly assigned 1:1 to AHCL or treatment as usual (CSII ± CGM).

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Objectives: Cerebral amyloid angiopathy (CAA)-associated lobar intracerebral hemorrhage (ICH) has a high risk of recurrence, but the underlying mechanisms remain uncertain. We, therefore, aimed to characterize patterns of recurrent ICH.

Methods: We investigated early recurrent ICH (≥1 recurrent ICH event within 90 days of the index event) and ICH clusters (≥2 ICH events within 90 days at any time point) in 2 large cohorts of consecutive patients with first-ever ICH and available MRI.

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Objectives: There is limited evidence on the effectiveness of parenting interventions to improve disruptive behaviour in children with intellectual developmental disabilities. This clinical trial evaluated whether an adapted group parenting intervention for preschool children with intellectual developmental disabilities who display challenging behaviour is superior to treatment as usual in England.

Study Design: 261 children aged 30-59 months with moderate to severe intellectual developmental disabilities and challenging behaviour were randomised to either the intervention (Stepping Stones Triple P) and treatment as usual or treatment as usual alone.

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Objectives: Clinical benefits of growth hormone (GH) in Prader-Willi syndrome (PWS) are proven and scoliosis is a known association of both PWS and GH therapy. The aims of this study were to assess GH prescribing practices and growth outcomes over time, the prevalence and predictors of scoliosis in GH-treated PWS children, and the near-final height of GH-treated PWS patients.

Design And Methods: This is a retrospective, descriptive study evaluating data from all clinic visits of patients aged 0-18 years with PWS, seen through the Children's Hospital at Westmead between March 1992 and May 2022 (n=75).

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Article Synopsis
  • COVID-19 is linked to severe inflammation and blood clotting issues, leading to high mortality, prompting a study on the effects of plasma exchange (PEX) in critically ill patients.
  • A phase II randomized control trial was conducted with 22 patients, where 11 received PEX, resulting in reduced pro-thrombotic markers but no significant changes in inflammatory markers or overall respiratory failure.
  • Despite effectively lowering specific thrombotic markers, PEX did not improve respiratory function, reduce inflammatory responses, or decrease mortality rates within 28 days.
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Background: Risk prediction models are routinely used to assist in clinical decision making. A small sample size for model development can compromise model performance when the model is applied to new patients. For binary outcomes, the calibration slope (CS) and the mean absolute prediction error (MAPE) are two key measures on which sample size calculations for the development of risk models have been based.

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Introduction: This meta-analysis aimed to explore the association of perivascular spaces (PVS) burden with the risks of future stroke events and mortality in patients with ischemic stroke and transient ischemic attack (TIA).

Methods: We systematically searched PubMed, Embase, and Cochrane database from inception to December 31, 2023. We included eligible studies that reported adjusted estimated effects for future intracranial hemorrhage (ICH), ischemic stroke, and mortality with baseline PVS burden in patients with ischemic stroke and TIA.

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Risk prediction models fitted using maximum likelihood estimation (MLE) are often overfitted resulting in predictions that are too extreme and a calibration slope (CS) less than 1. Penalized methods, such as Ridge and Lasso, have been suggested as a solution to this problem as they tend to shrink regression coefficients toward zero, resulting in predictions closer to the average. The amount of shrinkage is regulated by a tuning parameter, commonly selected via cross-validation ("standard tuning").

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Background And Objectives: Chronic kidney disease (CKD) may be associated with the pathogenesis and phenotype of cerebral small vessel disease (SVD), which is the commonest cause of intracerebral hemorrhage (ICH). The purpose of this study was to investigate the associations of CKD with ICH neuroimaging phenotype, volume, and location, total burden of small vessel disease, and its individual components.

Methods: In 2 cohorts of consecutive patients with ICH evaluated with MRI, we investigated the frequency and severity of CKD based on established Kidney Disease Improving Global Outcomes criteria, requiring estimated glomerular filtration rate (eGFR) measurements <60 mL/min/1.

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Purpose: Rehabilitation experiences of lower limb amputees with poorer physical health have not been fully explored. This study aimed to qualitatively explore experiences of rehabilitation amongst patients who had recently undergone amputation due to complications of vascular disease.

Methods: Semi-structured, face-to-face interviews were conducted with 14 patients participating in the PLACEMENT randomised controlled feasibility trial (ISRCTN: 85710690; EudraCT: 2016-003544-37), which investigated the effectiveness of using a perineural catheter for postoperative pain relief following major lower limb amputation.

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Aims: The potential harm associated with medication errors is widely reported, but data on actual harm are limited. When actual harm has been measured, assessment processes are often poorly described, limiting their ability to be reproduced by other studies. Our aim was to design and implement a new process to assess actual harm resulting from medication errors in paediatric inpatient care.

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Article Synopsis
  • This study looked at whether taking statins, a type of medicine, affects the chances of having a repeat stroke or bleeding in the brain for people who have certain brain issues called cerebral microbleeds (CMBs).
  • They analyzed data from many hospitals and included over 16,000 patients, dividing them into those who took statins and those who didn't.
  • The results showed that people who used statins had a lower risk of having another stroke but didn't show a clear difference in the risk of brain bleeding compared to those who didn't take statins.
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Background: Stepping Stones Triple P is an adapted intervention for parents of young children with developmental disabilities who display behaviours that challenge, aiming at teaching positive parenting techniques and promoting a positive parent-child relationship.

Objective: To evaluate the clinical and cost-effectiveness of level 4 Stepping Stones Triple P in reducing behaviours that challenge in children with moderate to severe intellectual disabilities.

Design, Setting, Participants: A parallel two-arm pragmatic multisite single-blind randomised controlled trial recruited a total of 261 dyads (parent and child).

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Article Synopsis
  • - The study evaluates the effectiveness of noninvasive respiratory support methods (NIV, CPAP, and HFNO) compared to conventional oxygen therapy (COT) for patients with COVID-19 experiencing acute hypoxaemic respiratory failure.
  • - Researchers conducted a network meta-analysis using data from eight randomized controlled trials involving 2302 patients to assess treatment failure and mortality rates associated with these therapies.
  • - Findings indicate that NIV, HFNO, and COT show similar outcomes in terms of treatment failure and mortality, suggesting no significant advantage of one method over the others for managing COVID-19 related respiratory failure.
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Aims: Improved behaviour, mood, cognition and HbA1c have been reported with short-term use of continuous subcutaneous insulin infusion (CSII) in youth with type 1 diabetes (T1D). We sought to re-examine these findings in a randomised controlled trial (RCT), with longitudinal follow-up.

Methods: RCT of youth aged 7-15 years with T1D, at two tertiary paediatric centres.

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Article Synopsis
  • Visible perivascular spaces (BGPVS) are linked to cerebral small vessel disease and may signal higher future stroke risk based on a large analysis of patient data.
  • The study analyzed 7,778 participants with recent ischemic stroke or transient ischemic attack (TIA), examining the relationship between BGPVS, CSOPVS, and various health factors.
  • Results indicated that a greater burden of BGPVS correlates with higher risks of ischemic stroke but not intracranial hemorrhage, while CSOPVS showed weaker associations overall.
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Background: The Live Well with Parkinson's Self-Management Toolkit is designed for use in the NHS to support people with Parkinson's, their carers and health professionals in managing motor and non-motor symptoms and promoting well-being. The Toolkit was developed based on theory-based behaviour change and self-management techniques in consultation with people living with Parkinson's and health and social care practitioners. There are digital (e-Toolkit) and paper (manual) versions.

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  • Intracranial arterial dolichoectasia (IADE) is a common vascular condition that often occurs in large intracranial blood vessels and is linked to risk factors like high blood pressure, especially in ischemic stroke patients.
  • A systematic review and meta-analysis of studies examined the relationship between IADE and small vessel disease (CSVD) markers, analyzing data from six studies with over 6,100 ischemic stroke patients.
  • Results indicated that patients with IADE had significantly higher rates of CSVD markers—such as lacunes, cerebral microbleeds, and white matter hyperintensities—suggesting a need for further research to understand these connections and their implications for treatment.
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