Publications by authors named "Colin Barker"

Background And Aims: The TRISCEND II trial demonstrated superior clinical benefits for patients with ≥severe tricuspid regurgitation (TR) treated with the EVOQUE transcatheter tricuspid valve replacement (TTVR) system plus medical therapy versus medical therapy alone. This work reports 1-year and 18-month outcomes in patients stratified by baseline TR severity.

Methods: The multicentre, prospective TRISCEND II trial enrolled 400 patients with symptomatic, ≥severe TR and randomised 2:1 to TTVR (n=267) or control (n=133).

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Background: Patients with severe tricuspid regurgitation (TR) are at risk for significant morbidity and mortality. Data on long-term clinical outcomes and health care resource utilization for this population are limited.

Methods: We used the Optum Market Clarity database from 2016 to 2022 to identify patients with severe TR based on a combination of physician documentation, claims for severe TR, and echocardiography within 3 months of the diagnosis.

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Background: There is a paucity of data on the impact of transcatheter mitral valve interventions on tricuspid regurgitation (TR).

Objectives: This study aimed to assess the impact of preprocedural TR, residual TR at 30 days, and the associated change in TR severity after transseptal mitral valve-in-valve (MViV) replacement on 3-year mortality.

Methods: The Society of Thoracic Surgeons/American College of Cardiology TVT (Transcatheter Valve Therapy) Registry was used to extract data for all patients (n = 5,971) undergoing MViV from 2015 to 2024 at 513 sites.

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Background: The efficacy of percutaneous mitral balloon valvuloplasty (PMBV) for mitral stenosis (MS) secondary to mitral annular calcification (MAC) is poorly understood. The purpose of this systematic review was to consolidate existing data on conventional and lithotripsy-facilitated PMBV in patients with calcific mitral valve disease, to better understand procedural outcomes.

Methods: We performed a systematic search of the literature published in PubMed and Scopus databases through May 2024.

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Article Synopsis
  • Opportunities to reduce inequities in accessing treatments for tricuspid regurgitation are highlighted in this study.
  • The research examines how payer coverage influences access to new heart technologies across different hospital settings in the U.S.
  • Results show that patients in areas with higher deprivation travel significantly longer distances to receive care, indicating a need for policy changes to improve access.
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  • The study investigated the bleeding risk associated with cangrelor in patients with myocardial infarction (MI) who had previously taken an oral P2Y inhibitor before angiography.
  • The CAMEO registry analyzed 1802 patients treated with cangrelor, finding that 21.4% had also received an oral P2Y inhibitor within the previous 24 hours.
  • Results showed no significant difference in bleeding rates between patients with and without prior oral P2Y inhibitor exposure, indicating that cangrelor use does not substantially increase bleeding risk in either group.
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Article Synopsis
  • * Results indicate high procedural success (96.6%) and relatively low mortality rates, with 1-year all-cause mortality being 13.4%. Improvements in patient functional class and quality of life were also observed post-procedure.
  • * Over the study period, there was a notable increase in the number of MViV procedures, coupled with reduced procedure times and hospital stays, highlighting advancements in the technique and
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Background: Clonal hematopoiesis of indeterminate potential (CHIP) occurs due to acquired mutations in bone marrow progenitor cells. CHIP confers a 2-fold risk of atherosclerotic cardiovascular disease. However, there are limited data regarding specific cardiovascular phenotypes.

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Current research in Human Immunodeficiency Virus (HIV) focuses on eradicating virus reservoirs that prevent or dampen the effectiveness of antiretroviral treatment (ART). One such reservoir, the brain, reduces treatment efficacy via the blood-brain barrier (BBB), causing an obstacle to drug penetration into the brain. In this study, we develop a mathematical model to examine the impact of the BBB on ART effectiveness for mitigating brain HIV.

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Background: Real-world applicability of the COAPT (Cardiovascular Outcomes Assessment of the MitraClip Percutaneous Therapy for Heart Failure Patients with Functional Mitral Regurgitation) randomized controlled trial (RCT) has been debated because of careful patient selection and the contrasting results of the MITRA-FR (Multicentre Study of Percutaneous Mitral Valve Repair MitraClip Device in Patients with Severe Secondary Mitral Regurgitation) RCT.

Objectives: The COAPT-PAS (COAPT Post-Approval Study) was initiated to assess the safety and effectiveness of the MitraClip in patients with secondary mitral regurgitation (SMR).

Methods: COAPT-PAS is a prospective, single-arm, observational study of 5,000 consecutive patients with SMR treated with the MitraClip at 406 U.

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Aims: The safety and efficacy of transcatheter aortic valve replacement (TAVR) with contemporary balloon expandable transcatheter valves in patients with cardiogenic shock (CS) remain largely unknown. In this study, the TAVRs performed for CS between June 2015 and September 2022 using SAPIEN 3 and SAPIEN 3 Ultra bioprosthesis from the Society of Thoracic Surgeons/American College of Cardiology Transcatheter Valve Therapy Registry were analysed.

Methods And Results: CS was defined as: (i) coding of CS within 24 h on Transcatheter Valve Therapy Registry form; and/or (ii) pre-procedural use of inotropes or mechanical circulatory support devices and/or (iii) cardiac arrest within 24 h prior to TAVR.

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Background: Heart failure with preserved ejection fraction represents a major unmet clinical need with limited treatment options. Recent device therapies under investigation have focused on decompression of the left atrium through an implantable interatrial shunt. Although these devices have shown favorable safety and efficacy signals, an implant is required to maintain shunt patency, which may increase the patient risk profile and complicate subsequent interventions requiring transseptal access.

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Background: The relationship between left ventricular (LV) remodeling and clinical outcomes after treatment of severe mitral regurgitation (MR) in heart failure (HF) has not been examined.

Objectives: The aim of this study was to evaluate the association between LV reverse remodeling and subsequent outcomes and assess whether transcatheter edge-to-edge repair (TEER) and residual MR are associated with LV remodeling in the COAPT (Cardiovascular Outcomes Assessment of the MitraClip Percutaneous Therapy for Heart Failure Patients With Functional Mitral Regurgitation) trial.

Methods: Patients with HF and severe MR who remained symptomatic on guideline-directed medical therapy (GDMT) were randomized to TEER plus GDMT or GDMT alone.

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Tricuspid regurgitation (TR) etiologies include primary valve pathology or secondary (functional) regurgitation from increased hemodynamic pressure or volume on the right side of the heart. Patients with severe TR have a worse prognosis independent of all other variables. Surgical treatment for TR has mostly been limited to patients undergoing concomitant left-sided cardiac surgery.

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Background: Most approaches to the creation of an interatrial shunt require placement of a permanent implant to maintain patency.

Objectives: The goal of this study was to investigate the safety and efficacy of a no-implant interatrial shunt for patients with heart failure with preserved ejection fraction (HFpEF) and heart failure with mildly reduced ejection fraction (HFmrEF).

Methods: This was a multicenter, uncontrolled study of patients with HFpEF/HFmrEF and NYHA functional class ≥II, ejection fraction >40%, and pulmonary capillary wedge pressure (PCWP) during supine exercise ≥25 mm Hg with PCWP-to-right atrial gradient ≥5 mm Hg.

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Background: The impact of transcatheter edge-to-edge repair (TEER) on national surgical mitral valve repair (MVr) volume and outcomes is unknown.

Objectives: This study aims to assess the impact of TEER availability on MVr volumes and outcomes for degenerative mitral regurgitation.

Methods: MVr volume, 30-day and 5-year outcomes, including mortality, heart failure rehospitalization and mitral valve reintervention, were obtained from the Society of Thoracic Surgeons database linked with Medicare administrative claims and were compared within TEER centers before and after the first institutional TEER procedure.

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Worsening aortic insufficiency (AI) is a known sequela of prolonged continuous-flow left ventricular assist device (LVAD) support with a significant impact on patient outcomes. While medical treatment may relieve symptoms, it is unlikely to halt progression. Surgical aortic valve replacement (SAVR) and transcatheter aortic valve replacement (TAVR) are among non-medical interventions available to address post-LVAD AI.

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Importance: In the setting of uncertain efficacy and additional, unreimbursed cost, use of an embolic protection device (EPD) during transcatheter aortic valve replacement (TAVR) has had variable uptake. The Centers for Medicare & Medicaid Services (CMS) instituted a new technology add-on payment to cover EPD use in October 2018.

Objective: To evaluate the association between CMS TAVR reimbursement rates and EPD use.

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We report the development of a large scale process for heat inactivation of clinical COVID-19 samples prior to laboratory processing for detection of SARS-CoV-2 by RT-qPCR. With more than 266 million confirmed cases, over 5.26 million deaths already recorded at the time of writing, COVID-19 continues to spread in many parts of the world.

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