Publications by authors named "Christopher Kwon"

Background: In the setting of the obesity epidemic and donor organ shortage in the United States, there is a growing need to expand the donor organ eligibility criteria for orthotopic heart transplantation (OHT). Donation after circulatory death (DCD) has emerged as a promising solution, but the outcomes with obese donor hearts in DCD OHT remains unknown.

Methods: Using the United Network for Organ Sharing registry between 2019 and 2024, recipients of DCD OHT were stratified into 3 donor obesity categories by body mass index (BMI): underweight/normal (BMI <25 kg/m), overweight (BMI 25-30 kg/m), and obese (BMI >30 kg/m).

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A 55-year-old man presented with chest pain and was diagnosed with non-ST-segment elevation myocardial infarction. Coronary angiography revealed a 95% eccentric lesion in the mid-right coronary artery. After 3 intracoronary stents were placed, the guidewire became entrapped in 1 of the stents; multiple attempts at retrieval were unsuccessful.

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  • Increased oxidative stress and inflammation play key roles in the development of Alzheimer's disease, and while hydrogen sulfide (HS) treatments have shown promise in reducing oxidative stress, their clinical efficacy is limited due to stability and toxicity issues.
  • Researchers have identified sulfanegen, a bioavailable prodrug, which successfully increases HS levels in the brain by enhancing the function of a key enzyme (3MST), helping to alleviate oxidative damage and inflammation associated with Alzheimer's.
  • In studies involving transgenic mice with Alzheimer's, sulfanegen not only reduced amyloid plaque burden and neuroinflammation but also protected against neurodegeneration, highlighting its potential as a future therapeutic option for the disease.
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  • Oxidative stress linked to Alzheimer's disease (AD) is partly due to the loss of glutathione (GSH), and a GSH analog called Ψ-GSH shows promise in reducing this stress and improving memory in mouse models of AD.
  • In a study, APP/PS1 transgenic mice were treated with Ψ-GSH at different ages, leading to reduced oxidative stress markers, restored enzyme activity, and decreased levels of harmful proteins associated with AD.
  • The findings suggest that Ψ-GSH not only decreases inflammation and protein deposits linked to AD but also protects against neuron loss, indicating its potential as a treatment for slowing or reversing AD progression.
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Clinically viable formulations of hydrophobic drugs, for example, chemotherapeutics, require strategies to promote sufficient drug solubilization. However, such strategies often involve the use of organic solvents that pose a significant risk in generating toxic, unstable products. Using verteporfin as a drug, a deep eutectic solvent (DES)-based approach to solvate drugs in a simple one-step process is reported.

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Approaches to safely and effectively augment cellular functions without compromising the inherent biological properties of the cells, especially through the integration of biologically labile domains, remain of great interest. Here, a versatile strategy to assemble biologically active nanocomplexes, including proteins, DNA, mRNA, and even viral carriers, on cellular surfaces to generate a cell-based hybrid system referred to as "Cellnex" is established. This strategy can be used to engineer a wide range of cell types used in adoptive cell transfers, including erythrocytes, macrophages, NK cells, T cells, etc.

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Background: We examined the outcomes of older adults undergoing nontrans-femoral (non-TF) transcatheter aortic valve replacement (TAVR) procedures including trans-apical (TA), trans-aortic (TAo), trans-subclavian (TSub), and trans-carotid (TCa) techniques.

Methods And Results: This is an observational study of all consecutive older patients who underwent non-TF TAVR for symptomatic severe AS with Edwards Sapien (ES), Medtronic CoreValve, ES3 or Lotus Valve at three centers in France and the United States from 04/2008 to 02/2017. Baseline characteristics and clinical outcomes were defined according to VARC-2 criteria.

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Background: Bilateral internal mammary artery (BIMA) grafting in diabetic patients undergoing coronary artery bypass grafting remains controversial. Our study compared morbidity and mortality between (1) diabetic and nondiabetic BIMA patients and (2) diabetic BIMA versus diabetic patients who underwent left internal mammary artery (LIMA) grafting only.

Methods: Patients who underwent isolated coronary artery bypass grafting from July 2011 to June 2016 at any of the 10 Maryland Cardiac Surgery Quality Initiative centers were propensity scored across 16 variables.

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  • The study investigated the impact of receiving 1 unit of red blood cells (RBCs) on outcomes for patients undergoing coronary artery bypass grafting (CABG) in Maryland.
  • Researchers analyzed data from 10,877 CABG patients between 2011 and 2016, finding that 9% received a discretionary transfusion.
  • Results showed that patients who did not receive RBCs had better 30-day survival rates and shorter hospital stays, suggesting that limiting discretionary transfusions could enhance patient outcomes.
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Background: Variation in red blood cell (RBC) transfusion practices exists at cardiac surgery centers across the nation. We tested the hypothesis that significant variation in RBC transfusion practices between centers in our state's cardiac surgery quality collaborative remains even after risk adjustment.

Methods: Using a multiinstitutional statewide database created by the Maryland Cardiac Surgery Quality Initiative (MCSQI), we included patient-level data from 8,141 patients undergoing isolated coronary artery bypass (CAB) or aortic valve replacement at 1 of 10 centers.

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Free wall rupture of the myocardium is an important complication and major cause of death following acute transmural (ST segment elevation) myocardial infarction. Pathologic changes on a cellular level may combine with mechanical stressors to weaken the myocardium postinfarction. Risk factors for myocardial rupture include advanced age, female gender, prior hyper-tension, first myocardial infarction, late presentation, lack of collateral blood flow, and persisting chest pain and ST segment elevations.

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Background: Outcomes may be improved by purposefully delaying surgical intervention of the traumatically ruptured descending thoracic aorta.

Methods: Fifty-seven patient records identified through the Trauma Registry of a level 1 trauma center between January 1993 and April 2002 were retrospectively analyzed between groups who underwent "clamp-and-sew" versus partial left heart bypass repair techniques and between emergent versus delayed repair.

Results: Thirty-two (56%) of 57 patients were male.

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