Publications by authors named "Beaudoin J"

The cis-regulatory elements encoded in an mRNA determine its stability and translational output. While there has been a considerable effort to understand the factors driving mRNA stability, the regulatory frameworks governing translational control remain more elusive. We have developed a novel massively parallel reporter assay (MPRA) to measure mRNA translation, named Nascent Peptide Translating Ribosome Affinity Purification (NaP-TRAP).

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Article Synopsis
  • Mutations causing premature termination codons (PTCs) in protein-coding genes lead to severe, often life-threatening genetic diseases that currently lack approved treatments.
  • Scientists are exploring suppressor tRNAs (sup-tRNAs) that could potentially translate these PTCs and restore protein synthesis, but developing efficient and specific sup-tRNAs is challenging.
  • This research introduces a new approach using a naturally occurring pyrrolysine tRNA (tRNAPyl) to create a series of engineered suppressor tRNAs (PASS-tRNAs), which successfully restored protein synthesis in both bacterial and human cells, showing promise for treating genetic disorders like BRCA1 mutations in cancer.
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  • Bicuspid aortic valve (BAV) shows increased progression of aorta dilation compared to tricuspid aortic valve (TAV) in patients with aortic stenosis, with a median annualized change of 0.33 mm/year for BAV versus 0.21 mm/year for TAV.
  • Factors influencing the dilation rate differ by valve type; BAV patients are more affected by low-density lipoprotein (LDL) levels, while TAV patients are influenced by the apolipoprotein B/A-I ratio and baseline aortic jet velocity.
  • The study highlights that men and women have different predictors for AA dilation; men’s dilation relates to baseline jet velocity and aortic diameter, while
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  • Long-acting reversible contraceptives (LARCs) are highly effective and essential for empowering patients' reproductive choices, prompting a quality improvement (QI) initiative to enhance access at a health center from March to June 2019.
  • An evaluation study used the Wilcoxon-rank test to analyze the impact of the QI interventions on the delivery of LARCs and related reimbursements.
  • Results showed a significant increase in LARC deliveries and an approximate $1,000 monthly rise in reimbursements post-intervention, suggesting successful QI implementation but highlighting the need for further research on equitable access across different populations.
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  • * A study involving blood and urine samples from both ADPKD patients and healthy volunteers revealed significant increases in toxic bile acids among the ADPKD group.
  • * The results suggest that elevated bile acids and specific compounds may heighten the risk of drug-induced liver injury and drug interactions in ADPKD patients due to impaired liver transport mechanisms.
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Background: Residual mitral regurgitation (MR) is associated with worse outcomes after transcatheter edge-to-edge mitral valve repair (TEER). Shear stress induced by MR leads to altered von Willebrand factor activity (vWF:Act) and increased closure time with adenosine diphosphate (CT-ADP).

Objectives: The purpose of this study was to investigate the use of CT-ADP to monitor MR during TEER and the association between the vWF, residual MR, and clinical events post-TEER.

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Multivalvular heart disease (MVHD) is present in one-third of patients with valvular heart disease (VHD). Compared to single VHD patients, these patients have a more significant hemodynamic impact and are often left under medical treatment. Most importantly, when undergoing multiple valve interventions, they show worse rates of heart failure and mortality.

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Background: A blood multimarker approach may be useful to enhance risk stratification in patients undergoing TAVI.

Objectives: The objective of this study was to determine the prognostic value of multiple blood biomarkers in transcatheter aortic valve implantation (TAVI) patients.

Methods: In this prospective study, several blood biomarkers of cardiovascular function, inflammation, and renal function were measured in 362 patients who underwent TAVI.

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Aims: Evaluation of left and right ventricular (RV) longitudinal systolic function may enhance risk stratification following aortic valve replacement (AVR). The study objective was to evaluate the changes in left and RV longitudinal systolic function and RV-pulmonary artery (RV-PA) coupling from baseline to 30 days and 1 year after AVR.

Methods And Results: Left ventricular (LV) longitudinal strain (LS), tricuspid annulus plane systolic excursion (TAPSE), and RV-PA coupling were evaluated in patients from the PARTNER 2A surgical AVR (SAVR) arm (n = 985) and from the PARTNER 2 SAPIEN 3 registry (n = 719).

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A 40-year-old man, newly diagnosed with cardiac sarcoidosis (CS) presented with symptomatic ventricular tachycardia three days after starting steroid-based immunosuppressive therapy (IT). There was no clear guideline indication for implantable cardioverter-defibrillator (ICD) before the initiation of IT. Shortly after ICD implantation and the initiation of anti-arrhythmic drugs, recurring ventricular arrhythmias required titration of the anti-arrhythmic drug therapy.

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Introduction: The use of race in clinical risk prediction tools may exacerbate racial disparities in healthcare access and outcomes. This study quantified the number of individuals reclassified for primary prevention of cardiovascular disease owing to a change in their race alone on the basis of a commonly used risk prediction tool.

Methods: This is a cross-sectional analysis of individuals aged 40-75 years without a history of cardiovascular events, diabetes, or other high-risk features using the 2005-2018 National Health and Nutritional Examination Survey.

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Background: Colorectal cancer (CRC) is a major cause of cancer mortality in the world. One of the most widely used screening tests for CRC is the immunochemical fecal occult blood test (iFOBT), which detects human hemoglobin from patient's stool sample. Although it is highly efficient in detecting blood from patients with gastro-intestinal lesions, such as polyps and cancers, the iFOBT has a high rate of false positive discovery.

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Sarcoidosis and systemic sclerosis are two inflammatory multisystemic disorders of unknown etiology that may be life-threatening especially when there is cardiac involvement. Both diseases may coexist, however, there are very few case reports of patients with both cardiac sarcoidosis and systemic sclerosis in the literature. We report the case of a 72-year-old female who was initially referred for dyspnea.

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Background And Objectives: ABO antigens are among the most immunogenic, but the haemolytic risks of ABO incompatibilities involving a donor with a weak ABO phenotype are little documented.

Materials And Methods: This retrospective case series assessed the incidence of acute haemolytic transfusion reaction (AHTR) among ABO-incompatible recipients of A blood in Québec (Canada). Transfusion safety officers reported laboratory AHTR indicators measured ≤24 h pre- and post-transfusion.

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Background: The long-term outcomes of patients undergoing functional assessment of coronary lesions with fractional flow reserve (FFR) while awaiting transcatheter aortic valve implantation (TAVI) are unknown. Data on the safety of intracoronary adenosine use in this setting are scarce. The objectives of this study were to describe (1) the long-term outcomes based on the coronary artery disease (CAD) assessment strategy used and (2) the safety of intracoronary adenosine in patients with severe aortic stenosis (AS).

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We propose an enhanced method to accurately retrieve time-activity curves (TACs) of blood and tissue from dynamic 2-deoxy-2-[F]fluoro-D-glucose ([F]FDG) positron emission tomography (PET) cardiac images of mice. The method is noninvasive and consists of using a constrained nonnegative matrix factorization algorithm (CNMF) applied to the matrix () containing the intensity values of the voxels of the left ventricle (LV) PET image. CNMF factorizes into nonnegative matrices and , respectively, representing the physiological factors (blood and tissue) and their associated weights, by minimizing an extended cost function.

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This study examined the experience of contraceptive counseling and care in a Federally Qualified Health Center in Maryland. Patients attending medical visits in 2021 were surveyed using the Interpersonal Quality of Family Planning scale to assess the quality of contraceptive counseling. Medical chart reviews were performed to identify alignment between contraceptive care received, and preferences patients had expressed.

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Biologics address a range of unmet clinical needs, but the occurrence of biologics-induced liver injury remains a major challenge. Development of cimaglermin alfa (GGF2) was terminated due to transient elevations in serum aminotransferases and total bilirubin. Tocilizumab has been reported to induce transient aminotransferase elevations, requiring frequent monitoring.

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Article Synopsis
  • Transcatheter valve-in-valve replacement (ViV-TAVR) is compared to redo-surgical aortic valve replacement (Redo-SAVR) for patients with failed aortic bioprostheses, focusing on their hemodynamic and clinical outcomes.
  • The study analyzed data from 184 patients, showing that ViV-TAVR had a significantly lower success rate in achieving optimal hemodynamic results shortly after the procedure compared to Redo-SAVR.
  • Long-term results indicated that Redo-SAVR had notably lower mortality rates over 8 years, despite a transiently higher 30-day mortality rate when compared to ViV-TAVR.
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The use of transcatheter edge-to-edge mitral valve repair (TEER) in symptomatic patients with severe mitral regurgitation (MR) has dramatically increased over the last few years. Current guidelines consider TEER as a reasonable option in symptomatic patients with primary or chronic secondary severe MR with high or prohibitive surgical risk and favorable anatomy. However, several anatomical and morphological mitral features have restricted the use of this mini-invasive technique in its early experience.

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Background: Toxic dilated cardiomyopathy (T-DCM) due to substance abuse is now recognized as a potential cause of severe left ventricular dysfunction. The burden of ventricular arrhythmias (VA) and the role of a prophylactic implantable cardioverter-defibrillator (ICD) are not well documented in this population. We aim to assess the usefulness of ICD implantation in a T-DCM cohort.

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Background: Primary mitral regurgitation (MR) is a heterogeneous clinical disease requiring integration of echocardiographic parameters using guideline-driven recommendations to identify severe disease.

Objectives: The purpose of this preliminary study was to explore novel data-driven approaches to delineate phenotypes of MR severity that benefit from surgery.

Methods: The authors used unsupervised and supervised machine learning and explainable artificial intelligence (AI) to integrate 24 echocardiographic parameters in 400 primary MR subjects from France (n = 243; development cohort) and Canada (n = 157; validation cohort) followed up during a median time of 3.

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Objectives: To determine associations between primary provider specialty and the contraceptive care that patients receive in a Federally Qualified Health Center setting in Maryland.

Methods: A study of reproductive-age patients and their providers was performed from January 2018 to December 2021. A pooled crosssectional survey of electronic medical record data for 44 127 encounters of 22 828 patients was performed to calculate the odds of contraceptive care being addressed by patients who had General Practitioner, OB/GYN, pediatrician, or infectious disease (ID) specialists as their primary providers.

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