Publications by authors named "Tom Nguyen"

Metabolic imbalance leading to inflammatory hypoxia and stabilization of hypoxia-inducible transcription factors (HIFs) is a hallmark of inflammatory bowel diseases. We hypothesize that HIF could be stabilized in CD4 T cells during intestinal inflammation and alter the functional responses of T cells via regulation of microRNAs. Our assays reveal markedly increased T cell-intrinsic hypoxia and stabilization of HIF protein during experimental colitis.

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Background: We aimed to assess the impact of complex mitral valve disease and patient risk profile on operative outcomes in the large cohort of the Mini-Mitral International Registry.

Methods: Patients were assigned to categories of complex degenerative mitral valve regurgitation (DMR; bileaflet or anterior mitral leaflet prolapse/flail) and simple DMR (posterior mitral leaflet prolapse/flail). Subgroup analyses was performed in low-risk (EuroSCORE II <8%) and high-risk (EuroSCORE II >8%) cohorts.

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Introduction: Interleukin-18 (IL-18), a pro-inflammatory cytokine belonging to the IL-1 Family, is a key mediator ofautoinflammatory diseases associated with the development of macrophage activation syndrome (MAS).High levels of IL-18 correlate with MAS and COVID-19 severity and mortality, particularly in COVID-19patients with MAS. As an inflammation inducer, IL-18 binds its receptor IL-1 Receptor 5 (IL-1R5), leadingto the recruitment of the co-receptor, IL-1 Receptor 7 (IL-1R7).

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Background: Bioprostheses with RESILIA tissue demonstrate a reduction in calcification and improve health outcomes in pre-clinical and clinical studies. Prior economic analyses which relied on 5 years of evidence from the COMMENCE trial demonstrate financial savings for RESILIA tissue valves relative to mechanical valves after surgical aortic valve replacement (SAVR). Given the recent release of 7-year COMMENCE data, this economic evaluation updates the estimate for long-run savings of bioprosthetic valves with RESILIA.

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Article Synopsis
  • Mitral valve repair (MVr) is the standard treatment for degenerative mitral regurgitation (DMR), but data on long-term outcomes in real-world settings is limited.
  • The study analyzed outcomes for 4,219 DMR patients over 65 who underwent MVr, focusing on various procedures and adjusted for patient demographics and conditions.
  • Results showed low mortality (3.5%) and reintervention (1.6%) rates at 3 years, but higher rates in patients who had additional surgeries; acute kidney injury and stroke were common complications.
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The COVID-19 pandemic exacerbated health disparities among immigrant communities. Delivering accurate information and addressing misinformation on protective measures and vaccination to linguistically disadvantaged groups was critical for mitigating the effects of the pandemic. One group that was especially vulnerable to miscommunication about COVID-19 was non-native English-speaking immigrants.

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Article Synopsis
  • Activating point mutations in the MET tyrosine kinase domain are identified as oncogenic drivers in various cancers, occurring in about 0.5% of cases, particularly in certain papillary renal cell carcinomas.
  • Specific mutations at positions H1094, L1195, F1200, D1228, Y1230, and M1250 were labeled as oncogenic or likely oncogenic based on genetic profiling.
  • Preclinical models and patient responses indicate that these mutations may enhance sensitivity to MET inhibitors, highlighting the potential for targeted precision treatments in oncology.
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Objective: Randomized evidence suggests a high risk of pacemaker implantation for patients undergoing mitral valve (MV) surgery with concomitant tricuspid valve repair (cTVR). We investigated the impact of cTVR on outcomes in the Mini-Mitral International Registry.

Methods: From 2015 to 2021, 7513 patients underwent minimally invasive MV with or without cTVR in 17 international centers (MV: n = 5609, cTVR: n = 1113).

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  • The study investigates the differences in outcomes between two types of failed transcatheter heart valves (balloon-expandable valves vs. self-expanding valves) during surgical explantation.
  • Analyzing data from 401 patients, it reveals that failed balloon-expandable valves had higher rates of certain complications like endocarditis and paravalvular leaks compared to self-expanding valves.
  • Overall, mortality rates and stroke rates were similar across both groups post-explantation, but concomitant mitral surgery emerged as a significant independent predictor of 1-year mortality for both valve types.
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Introduction: NUT carcinoma (NC) is an underdiagnosed and aggressive poorly differentiated or squamous cell cancer. A subset of NC is sensitive to chemotherapy, but the optimal regimen is unknown. Experts have recommended platinum- and ifosfamide-based therapy based on case reports.

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Purpose: ManageMySurgery (MMS) is a digital health application (app) for patients undergoing surgery, including Transcatheter Aortic Valve Replacement (TAVR). Patients using MMS review procedure-specific education, view FAQs, and report patient-reported outcomes. This study assessed the impact of app use on postoperative outcomes.

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Advanced training in cardiothoracic surgery has become more prevalent in the setting of increased complexity of interventions. Minimally invasive techniques, transcatheter and endovascular interventions, and rapid growth in mechanical circulatory support and transplant have led approximately 40% of trainees to pursue additional training. Available data suggest trainees seek additional training for 3 main reasons: gain an additional skillset, improve candidacy for a job, and/or increase proficiency in basic areas.

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The heat shock response is a critical component of the inflammatory cascade that prevents misfolding of new proteins and regulates immune responses. Activation of clusters of differentiation (CD)4 T cells causes an upregulation of heat shock transcription factor, heat shock factor 1 (HSF1). We hypothesized that HSF1 promotes a pro-regulatory phenotype during inflammation.

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Objectives: The aim of this study was to examine the incidence and predictors of stroke after minimally invasive mitral valve surgery (mini-MVS) and to assess the role of preoperative CT scan on surgical management and neurological outcomes in the large cohort of Mini-Mitral International Registry.

Methods: Clinical, operative and in-hospital outcomes in patients undergoing mini-MVS between 2015 and 2021 were collected. Univariable and multivariable analyses were used to identify predictors of stroke.

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Digital health interventions have shown promise in improving patient outcomes and experiences in various healthcare settings. However, their effectiveness in the context of cardiac surgery remains uncertain. This systematic review aims to evaluate the existing evidence on the use of digital health interventions for patients undergoing cardiac surgery.

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Background: Surgery demands long hours and intense exertion raising ergonomic concerns. We piloted a sensorless artificial intelligence (AI)-assisted ergonomics analysis app to determine its feasibility for use with residents.

Methods: Surgery residents performed simulated laparoscopic tasks before and after a review of the SCORE ergonomics curriculum while filmed with a sensorless app from Kinetica Labs that calculates joint angles as a metric of ergonomics.

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Background: Recent reports have demonstrated worse than expected outcomes of surgical explantation after transcatheter aortic valve replacement (TAVR). However in-depth analysis of the short- and mid-term risk of concomitant cardiac surgery at the time of TAVR explant is lacking.

Methods: Data from the multicenter EXPLANT-TAVR registry of patients undergoing TAVR-explant between November 2009 and September 2020 were retrospectively analyzed.

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