Publications by authors named "Fremes S"

The structural and functional integrity of conduits used for coronary artery bypass grafting is critical for graft patency. Disruption of endothelial integrity and endothelial dysfunction are incurred during conduit harvesting subsequent to mechanical or thermal injury and during conduit storage prior to grafting, leading to acute thrombosis and early graft failure. Late graft failure, in particular that of vein grafts, is precipitated by progressive atherogenesis.

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Background: There is concern that left internal thoracic artery (LITA)-to diagonal (D)-to left anterior descending artery (LAD) grafts may be more susceptible to failure compared with single LITA-LAD grafts.

Methods: Pooled individual patient data from 8 clinical trials with systematic graft imaging were analyzed to assess the incidence of sequential LITA-D-LAD vs single LITA-LAD grafts. Mixed-effects multivariable logistic regression, adjusting for patient characteristics and clustering within trials, was used.

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Background: Whether revascularisation (REV) improves outcomes in patients with three-vessel coronary artery disease (3V-CAD) is uncertain.

Aims: Our objective was to evaluate outcomes with REV (percutaneous coronary intervention [PCI] or coronary artery bypass graft surgery [CABG]) versus medical therapy in patients with 3V-CAD.

Methods: ISCHEMIA participants with 3V-CAD on coronary computed tomography angiography without prior CABG were included.

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Article Synopsis
  • - The integrity of conduits for coronary artery bypass grafting is crucial for their long-term success, as damage during harvesting and storage can lead to graft failure or thrombosis.
  • - Effective intra-operative management involves choosing the right techniques for harvesting and protecting the conduits, as well as using vasodilators to prevent vasospasm.
  • - Post-operative care includes continuing vasodilator therapy and using medications to prevent atherosclerosis progression, with the review highlighting both established practices and areas needing further study.
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  • The study investigates the best revascularization method for diabetic patients with multivessel disease who experience a non-ST-segment elevation myocardial infarction (NSTEMI), comparing coronary artery bypass grafting (CABG) and multivessel percutaneous coronary intervention (PCI).
  • It involves a large cohort of over 11,000 patients and reveals that CABG is linked to lower all-cause mortality than PCI, particularly in patients deemed potentially ineligible for CABG after a surgical consultation.
  • The results suggest that while CABG is generally more beneficial for these patients, the advantage is more pronounced when comparing CABG to a specific group of PCI patients who had a surgical consultation beforehand.
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Background: Despite impressive improvements in the safety profile of Transcatheter aortic valve replacement (TAVR), the risk for peri-procedural stroke after TAVR has not declined substantially. In an effort to reduce periprocedural stroke, cerebral embolic protection (CEP) devices have been utilized but have yet to demonstrate benefit in all-comers. There is a paucity of data supporting the utilization of CEP in TAVR patients with an anticipated high risk for peri-procedural stroke.

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  • Neurocognitive dysfunction affects 30% to 80% of heart failure patients, impacting memory, attention, and other cognitive areas due to factors like reduced cardiac output and brain injury.
  • Cognitive impairment is linked to worse health outcomes, such as higher mortality and rehospitalization rates, especially in patients struggling with treatment adherence.
  • While coronary revascularization may improve heart function, it poses risks for cognitive decline; thus, alternative less-invasive methods, like percutaneous coronary intervention, need further evaluation to better manage neurocognitive health in these patients.
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Background: Demand for transcatheter aortic valve implantation (TAVI) has increased in the last decade, resulting in prolonged wait-times and undesirable health outcomes in many health systems. Risk-based prioritization and wait-times benchmarks can improve equitable access to patients.

Methods And Results: We used simulation models to follow-up a synthetic population of 50 000 individuals from referral to completion of TAVI.

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Article Synopsis
  • Women experience higher rates of graft failure after coronary artery bypass surgery (CABG) compared to men, with significant differences observed at both the patient and graft levels.
  • The study found that graft failure in women is linked to a greater risk of myocardial infarction, the need for repeat procedures, and increased mortality, confirming the poor outcomes following CABG for females.
  • However, the increased risk of death associated with being female post-surgery is not due to graft failure, suggesting other factors contribute to these sex-related differences in outcomes.
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Background: Increased particulate matter <2.5 μm (PM) air pollution is associated with adverse cardiovascular outcomes. However, its impact on patients with prior coronary artery bypass grafting (CABG) is unknown.

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Aim: The cardiac surgery-related ischemia-reperfusion-related oxidative stress triggers the release of cytotoxic reactive oxygen and nitrogen species, contributing to organ failure and ultimately influencing patients' short- and long-term outcomes. Selenium is an essential co-factor for various antioxidant enzymes, thereby contributing to the patients' endogenous antioxidant and anti-inflammatory defense mechanisms. Given these selenium's pleiotropic functions, we investigated the effect of a high-dose selenium-based anti-inflammatory perioperative strategy on functional recovery after cardiac surgery.

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Background: Coronary artery disease is a common cause of ischemic left ventricular systolic dysfunction (LVSD), for which the optimal revascularisation strategy remains unclear. We aimed to determine whether percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG) results in greater survival advantage in patients with LVSD.

Methods: Study-level (SLMA) and reconstructed individual patient data (rIPDMA) meta-analyses from Kaplan-Meier (KM) survival curves were performed.

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Background: Research shows women experience higher mortality than men after cardiac surgery but information on sex-differences during postoperative recovery is limited. Days alive and out of hospital (DAH) combines death, readmission and length of stay, and may better quantify sex-differences during recovery. This main objective is to evaluate (i) how DAH at 30-days varies between sex and surgical procedure, (ii) DAH responsiveness to patient and surgical complexity, and (iii) longer-term prognostic value of DAH.

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Purpose Of Review: The no-touch technique is an established method to harvest the saphenous vein (NT-SV), which is the most commonly used conduit in coronary artery bypass grafting. Herein, we summarize the foundational evidence, as well as highlight recent innovations and ongoing clinical trials involving NT-SV.

Recent Findings: Through preservation of perivascular tissue for atraumatic handling and omission of manual distension, the NT-SV maintains endothelial nitrous oxide synthase levels and experiences less vascular smooth muscle cell activation, which translates to slower progression of atherosclerosis and less size mismatch of the graft and target vessel.

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Objectives: Randomized controlled trials are the gold standard for evidence generation in medicine but are limited by their real-world generalizability, resource needs, shorter follow-up durations and inability to be conducted for all clinical questions. Decision analysis (DA) models may simulate trials and observational studies by using existing data and evidence- and expert-informed assumptions and extend analyses over longer time horizons, different study populations and specific scenarios, helping to translate population outcomes to patient-specific clinical and economic outcomes. Here, we present a scoping review and methodological primer on DA for cardiac surgery research.

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Article Synopsis
  • * Short-term dual antiplatelet therapy may be more effective soon after surgery, followed by maintenance on single antiplatelet therapy to balance risks and benefits.
  • * The ODIN trial is a large study that aims to assess if one month of ticagrelor combined with aspirin can improve outcomes for patients with chronic coronary syndromes post-CABG, with important metrics being death, stroke, and graft failure after one year.
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Cardiac surgery may lead to myocardial damage and release of cardiac biomarkers through various mechanisms such as cardiac manipulation, systemic inflammation, myocardial hypoxia, cardioplegic arrest and ischaemia caused by coronary or graft occlusion. Defining perioperative myocardial infarction (PMI) after cardiac surgery presents challenges, and the association between the current PMI definitions and postoperative outcomes remains uncertain. To address these challenges, the European Association of Cardio-Thoracic Surgery (EACTS) facilitated collaboration among a multidisciplinary group to evaluate the existing evidence on the mechanisms, diagnosis and prognostic implications of PMI after cardiac surgery.

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Background: Transcatheter aortic valve implantation (TAVI) has seen indication expansion and thus exponential growth in demand over the past decade. In many jurisdictions, the growing demand has outpaced capacity, increasing wait times and preprocedural adverse events. In this study, we derived prediction models that estimate the risk of adverse events on the waitlist and developed a triage tool to identify patients who should be prioritized for TAVI.

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In an era focused on value-based healthcare, the quality of healthcare and resource allocation should be underpinned by empirical evidence. Pragmatic clinical trials (pRCTs) are essential in this endeavor, providing randomized controlled trial (RCT) insights that encapsulate real-world effects of interventions. The rising popularity of pRCTs can be attributed to their ability to mirror real-world practices, accommodate larger sample sizes, and provide cost advantages over traditional RCTs.

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Article Synopsis
  • Coronary artery disease (CAD) poses significant challenges, particularly for older patients with comorbidities; many who could benefit from revascularisation procedures like PCI or CABG are often excluded from clinical trial eligibility.
  • Recent American guidelines provide recommendations for managing CAD, yet they may not adequately address complex patient presentations, highlighting the need for a more nuanced understanding among healthcare providers.
  • The narrative review aims to summarize clinical scenarios not covered by current guidelines, emphasizing the importance of evidence-based medicine, patient preferences, and collaborative decision-making in managing complex CAD cases.
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