Publications by authors named "Saxon J"

Article Synopsis
  • Transcatheter closure of atrial septal defects (ASD) and patent foramen ovale (PFO) was studied using either transesophageal echocardiography (TEE) or intracardiac echocardiography (ICE) for guidance, but there's a lack of comparative data on these methods.
  • The study analyzed data from 964 patients who underwent these procedures between 2016 and 2020, matching 327 patients in each group for a fair comparison of outcomes like in-hospital adverse events, length of stay, cost, and 30-day readmissions.
  • Results showed no significant difference in adverse events between the methods, but ICE was linked to lower hospitalization costs compared to TEE, indicating ICE
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  • * A study analyzed 4,685 sporadic FTD cases and found significant genetic variants at the MAPT and APOE loci that increase the risk for the disease, indicating potential genetic overlap with other neurodegenerative diseases.
  • * The genetic risk factors appear to vary by population, with MAPT and APOE associations predominantly found in Central/Nordic and Mediterranean Europeans, suggesting a need for further research into these population-specific features for better understanding of sporadic FTD.
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  • * RMVI procedures were mostly successful at a rate of 80%, but patients who underwent RMVI experienced increased heart failure hospitalizations compared to those who did not.
  • * Characteristics of patients needing RMVI included larger mitral annular diameters and more severe MR at discharge, with potential reasons for RMVI stemming from initial procedure failures or residual severe MR.
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  • Multiple system atrophy (MSA) is a neurodegenerative disease that leads to symptoms like parkinsonism and ataxia, but its genetic causes are not well understood and treatment options are limited to supportive care.
  • A comprehensive study involving the whole genome sequencing of nearly 900 MSA patients and over 7,000 controls discovered four key genetic risk factors associated with the disease.
  • The research identified potential susceptibility genes and provided insights into how genetic variations influence gene expression in brain cells, offering a valuable resource for further studies on similar diseases.
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Background: Baseline left ventricular diastolic dysfunction (LVDD) is associated with poor health status in patients with severe aortic stenosis undergoing transcatheter aortic valve replacement (TAVR), but health status improvement after TAVR appears similar across all grades of LVDD. Here, we aim to examine the relationship between changes in LVDD severity and health status outcomes following TAVR.

Methods: Patients who underwent TAVR and had evaluable LVDD at both baseline and 1 year in the PARTNER (Placement of Aortic Transcatheter Valves) 2 SAPIEN 3 registries and PARTNER 3 trial were analyzed.

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  • The study examines the use of cerebral embolic protection devices (CEPD) during transcatheter aortic valve implantation (TAVI) across US hospitals to understand their effectiveness in preventing strokes.
  • Out of over 41,800 TAVI procedures analyzed, only 10.6% utilized CEPD, with 65.8% of hospitals not using these devices.
  • Results indicated no significant differences in stroke or death rates between hospitals that used CEPD and those that did not, while costs were found to be lower in non-user hospitals.
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Background: Little is known about the outcomes of transcatheter aortic valve replacement (TAVR) in minimally symptomatic patients.

Objectives: The authors aimed to evaluate the outcomes of patients with minimally symptomatic severe aortic stenosis treated with TAVR in the STS/ACC TVT registry.

Methods: Minimally symptomatic status was defined as a baseline Kansas City Cardiomyopathy Questionnaire overall summary score (KCCQ-OS) ≥75.

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Background: Intracoronary (IC) imaging for percutaneous coronary intervention (PCI) is associated with better patient outcomes and carries a class IIA guideline recommendation, but it remains rarely used. We sought to characterize hospital-level variability in IC imaging for PCI in the United States and to identify factors that may explain this variability.

Methods: Patients who underwent PCI, with or without IC imaging, in the Nationwide Readmissions Database (2016-2020) were included.

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Spontaneous coronary artery dissection (SCAD) should be considered in the differential diagnosis of patients with provisional Takotsubo cardiomyopathy (TTS). However, because of overlapping clinical features, SCAD with subtle angiographic findings and wall motion abnormality like TTS can be easily missed. Therefore, our case highlights the importance of further investigation for SCAD.

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Background: Rehospitalization is a common end point in clinical trials of structural heart interventions, but whether rehospitalization is clinically and prognostically relevant in these patients is uncertain. The aim of this study was to evaluate the risk of rehospitalization events after aortic valve replacement (AVR) and their association with mortality and health status.

Methods: The study population included patients who underwent transcatheter or surgical AVR in the PARTNER I' II' and III trials (Placement of Aortic Transcatheter Valves).

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Colonoscopy surveillance depends on effective bowel preparation. Inadequate bowel preparation can lead to inaccurate clinical diagnosis, insufficient visualization of the colon and increased risk of missed diagnosis. This study aimed to compare the efficacy and safety of a novel Capsule Bowel Preparation (RitePrep), high-volume (2L) polyethylene glycol electrolyte solution (MoviPrep®) and low-volume (1L) polyethylene glycol electrolyte solution (Plenvu™).

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Valve-in-valve transcatheter aortic valve replacement (VIV TAVR) is currently indicated for the treatment of failed surgical tissue valves in patients determined to be at high surgical risk for re-operative surgical valve replacement. VIV TAVR, however, often results in suboptimal expansion of the transcatheter heart valve (THV) and can result in patient-prosthesis mismatch (PPM), particularly in small surgical valves. Bioprosthetic valve fracture (BVF) and bioprosthetic valve remodeling (BVR) can facilitate VIV TAVR by optimally expanding the THV and reducing the residual transvalvular gradient by utilizing a high-pressure inflation with a non-compliant balloon to either fracture or stretch the surgical valve ring, respectively.

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Background Hospitalization rates after transcatheter aortic valve replacement (TAVR) remain high, given the age and comorbidities of patients undergoing TAVR. To better understand the impact of TAVR on hospitalization, we sought to compare hospitalization rates before and after TAVR and to examine if underlying patient comorbidities are associated with a differential effect of TAVR on hospitalizations. Methods and Results We used the Nationwide Readmissions Database to identify patients who underwent TAVR.

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Objectives: This study sought to understand the extent to which health status and exercise capacity are independently associated with long-term outcomes in patients with heart failure (HF) and secondary mitral regurgitation (MR).

Background: Secondary MR in patients with HF leads to impaired health status (Kansas City Cardiomyopathy Questionnaire Overall Summary Score [KCCQ-OS]) and exercise capacity (6-minute walk distance [6MWD]), both of which improve after transcatheter mitral valve repair (TMVr).

Methods: The study used data from the COAPT trial (N = 604) to examine the association of baseline KCCQ-OS and 6MWD with 2-year mortality and HF hospitalization, adjusting for treatment arm and patient factors.

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A 48-year-old woman presented with heart failure and bioprosthetic pulmonary valve regurgitation 2 years after pulmonary valve replacement. Intracardiac echocardiography demonstrated uniform thickening of a single prosthetic valve leaflet suggesting leaflet thrombosis rather than bioprosthetic valve degeneration. After 3 months of anticoagulation, valve regurgitation and symptoms improved.

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Objectives: The aim of this study was to examine the relationship between chronic obstructive pulmonary disease (COPD) and outcomes after transcatheter mitral valve repair (TMVr) for severe secondary mitral regurgitation.

Background: TMVr with the MitraClip improves clinical and health-status outcomes in patients with heart failure and severe (3+ to 4+) secondary mitral regurgitation. Whether these benefits are modified by COPD is unknown.

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Article Synopsis
  • Clinical trials show that transcatheter mitral valve repair (TMVr) with MitraClip improves health status for patients with mitral valve regurgitation, but real-world outcomes vary across different sites.
  • A study included over 12,000 patients to assess health status changes using the Kansas City Cardiomyopathy Questionnaire (KCCQ) at baseline and after 30 days following the procedure.
  • It was found that the patient's initial health status was the main factor influencing outcomes, explaining about 25% of the variability in improvements, while site-specific factors contributed very little.
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Objective: Transcarotid access for transcatheter aortic valve replacement is emerging as an alternative to more traditional nonfemoral access options such as transapical or transaortic; however, comparative data are limited. The purpose of the study was to analyze outcomes after transcatheter aortic valve replacement using transcatheter compared with transthoracic (transapical/transaortic) access.

Methods: The Society of Thoracic Surgeons/American College of Cardiology Transcatheter Valve Therapy Registry was queried for patients who underwent transcarotid, transapical, or transaortic transcatheter aortic valve replacement with the SAPIEN 3 (Edwards Lifesciences, Irvine, Calif) transcatheter heart valve between June 2015 and July 2019.

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Objective: The precise relationship between frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) is incompletely understood. The association has been described as a continuum, yet data suggest that this may be an oversimplification. Direct comparisons between patients who have behavioural variant FTD (bvFTD) with and without ALS are rare.

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Background: The canonical and non-canonical nuclear factor-kappaB (NF-κB) signaling pathways have key roles in cancer, but studies have previously evaluated only the association of canonical transcription factors and ovarian cancer survival. Although a number of in vitro and in vivo studies have demonstrated mechanisms by which non-canonical NF-κB signaling potentially contributes to ovarian cancer progression, a prognostic association has yet to be shown in the clinical context.

Methods: We assayed p65 and p52 (major components of the canonical and non-canonical NF-κB pathways) by immunohistochemistry in epithelial ovarian tumor samples; nuclear and cytoplasmic staining were semi-quantified by H-scores and dichotomized at median values.

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Article Synopsis
  • The study aimed to understand the relationship between genetic expansions, age at onset, and syndromic differences in frontotemporal lobar degeneration (FTLD) using a large European sample.
  • Researchers found that pathogenic expansions were more common in patients with behavioral variant frontotemporal dementia (bvFTD) compared to primary progressive aphasia (PPA), and there were notable differences based on genetic ancestry.
  • The findings suggest a link between genetic factors, ancestry, and the development of bvFTD, highlighting the complexity of genetic risk associated with this condition.
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