Publications by authors named "John R Power"

Background And Aims: Immune checkpoint inhibitors (ICI) are associated with life-threatening myocarditis but milder presentations are increasingly recognized. The same autoimmune process that causes ICI myocarditis can manifest concurrent generalized myositis, myasthenia-like syndrome, and respiratory muscle failure. Prognostic factors for this 'cardiomyotoxicity' are lacking.

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Background: Immune checkpoint inhibitors (ICIs) have transformed cancer treatment, but ICI myocarditis (ICI-M) remains a potentially fatal complication. The clinical implications and predictors of left ventricular ejection fraction (LVEF) <50% in ICI-M are not well understood.

Objectives: The aim of this study was to identify factors associated with LVEF <50% vs ≥50% at the time of hospitalization for ICI-M.

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Recent advances have given rise to a spectrum of digital health technologies that have the potential to revolutionize the design and conduct of cardiovascular clinical trials. Advances in domain tasks such as automated diagnosis and classification, synthesis of high-volume data and latent data from adjacent modalities, patient discovery, telemedicine, remote monitoring, augmented reality, and in silico modelling have the potential to enhance the efficiency, accuracy, and cost-effectiveness of cardiovascular clinical trials. However, early experience with these tools has also exposed important issues, including regulatory barriers, clinical validation and acceptance, technological literacy, integration with care models, and health equity concerns.

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Background: Complications associated with cardiovascular implantable electronic devices may necessitate device and lead removal. An open approach to removal may be electively chosen in cases with high risk of complications or those requiring additional concomitant cardiac surgery. This study aimed to investigate outcomes of patients who underwent elective open lead extractions (OLE) at two large tertiary care centers.

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Article Synopsis
  • Immune-checkpoint inhibitors (ICIs) can lead to serious heart issues like myocarditis, which can also involve broader muscle-related symptoms, highlighting the need for understanding associated risks.
  • A study conducted across 17 countries from 2014 to 2023 examined data from 748 patients to identify factors that predict severe outcomes related to these heart complications, using a statistical model for analysis.
  • Key findings indicated that certain conditions (like active thymoma) and symptoms (like low heart function) significantly increased the risk of severe heart-related events, and a risk score created from these factors effectively predicted outcomes, validated in multiple cohorts.
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Article Synopsis
  • * Research shows that patients with thymic epithelial tumors (TET), especially thymoma, experience ICI-related myotoxicities more frequently and with greater severity than those with other cancers.
  • * The presence of anti-acetylcholine-receptor antibodies suggests a link between thymic-related autoimmune responses and ICI myotoxicities, indicating that assessing the thymus could help predict these serious side effects in patients undergoing ICI therapy.
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Background: Immune checkpoint inhibitors (ICIs) are approved for multiple cancers but can result in ICI-associated myocarditis, an infrequent but life-threatening condition. Elevations in cardiac biomarkers, specifically troponin-I (cTnI), troponin-T (cTnT), and creatine kinase (CK), are used for diagnosis. However, the association between temporal elevations of these biomarkers with disease trajectory and outcomes has not been established.

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Background: Immune-checkpoint inhibitor-associated myocarditis (ICI-myocarditis) often presents with arrhythmias, but the prognostic value of early electrocardiogram findings is unclear. Although ICI-myocarditis and acute cellular rejection (ACR) following cardiac transplantation use similar treatment strategies, differences in arrhythmia burden are unknown.

Objective: To evaluate the association of electrocardiogram findings in ICI-myocarditis with myocarditis-related mortality and life-threatening arrhythmia.

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Introduction: Vaccines have demonstrated protection against the morbidity and mortality of COVID-19, but concerns regarding the rare side effect of acute myocarditis have stymied immunization efforts. This review aims to describe the incidence and theorized mechanisms of COVID vaccine-associated myocarditis and review relevant principles for management of vaccine-associated myocarditis.

Areas Covered: Epidemiologic studies of myocarditis after COVID vaccination are reviewed, which show an incidence of approximately 20-30 per million patients.

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Purpose Of Review: Histologic evidence of myocardial inflammatory infiltrate not secondary to an ischemic injury is required by current diagnostic criteria to reach a definite diagnosis of myocarditis. Endomyocardial biopsy (EMB) is therefore often indicated for the diagnosis of myocarditis, although it may lack sufficient sensitivity considering the limited possibility of myocardial sampling. Improving the diagnostic yield and utility of EMB is of high priority in the fields of heart failure cardiology and myocarditis in particular.

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This series describes an innovative technique to deploy iliac branched endoprostheses (IBEs) in patients with preexisting endovascular aneurysm repair (EVAR). It demonstrates an alternative approach that may be preferred when brachial access is anatomically challenging or when access site complications are of concern. We detail a technique that uses transfemoral access to bring IBE device components up and over an infrarenal endograft bifurcation and into proper position.

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Background: Prophylactic vena cava filter (VCF) use in patients without venous thromboembolism is common practice despite ongoing controversy. Thorough analysis of the evolution of this practice is lacking. We describe trends in VCF use and identify events associated with changes in practice.

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Skyrocketing costs of prescription medications in the USA pose a significant threat to the financial viability of safety net clinics that opt to supply medications at low to no out-of-pocket costs to patients. At the East Harlem Health Outreach Partnership clinic of the Icahn School of Medicine at Mount Sinai, a physician-directed student-run comprehensive primary care clinic for uninsured adults of East Harlem, expenditures on pharmaceuticals represent nearly two-thirds of annual costs. The practice of minimising costs while maintaining quality, referred to as care, represents a critical cost-saving opportunity for safety net clinics as well as for more economical healthcare in general.

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Objective: The purpose of this study was to evaluate the impact of preoperative inflammatory status, as determined by complete blood count test parameters, on 12- and 24-month patency of femoropopliteal stenting for peripheral arterial disease.

Methods: We retrospectively analyzed baseline clinical and angiographic data among 138 patients (median age, 73 years; 46% female) from 2005 to 2014 at our institution with preoperative complete blood count test values and information of patency for at least 12 months after first-time femoropopliteal stenting. Patients were stratified into tertiles on the basis of preoperative blood counts to evaluate associations with in-stent restenosis (ISR) leading to loss of primary patency, defined by a Doppler velocity ratio ≥2.

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Background: As part of the Surgical Care Improvement Project (SCIP), a national quality partnership of organizations including the Centers for Medicare and Medicaid Services and the Centers for Disease Control and Prevention implemented several perioperative guidelines regarding antibiotic, venous thromboembolism (VTE), and beta-blocker prophylaxis for surgical patients. We evaluated the effect of SCIP on in-hospital surgical site infections (SSI), graft infections, VTE, myocardial infarctions (MIs), cardiac complications, mortality, and length of stay following elective major vascular surgery.

Methods: Using International Classification of Diseases, Ninth Revision (ICD-9) diagnostic and procedure codes, we identified elective open abdominal aneurysm repair (OAR), endovascular aneurysm repair (EVAR), carotid endarterectomy (CEA), major lower extremity amputation, and lower extremity bypass (LEB) procedures in the National Inpatient Sample from 2000 to 2012.

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This case describes the surgical repair of critical limb ischemia in a patient with diffuse multilevel peripheral arterial disease. It demonstrates the value of patient-specific approaches that employ hybrid endovascular and open surgical techniques to reconstruct blood flow in patients who are not ideal candidates for traditional revascularization. We detail a technique that combines endarterectomy, femoropopliteal bypass, angioplasty, and stenting.

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