Publications by authors named "Yuji Itabashi"

Aim: We aimed to determine whether baseline high-density lipoprotein (HDL) cholesterol efflux capacity (CEC) at the time of coronary angiography (CAG) could serve as a prognostic marker for future major adverse cardiovascular events (MACE) in patients with coronary artery disease (CAD) through a systematic review and meta-analysis.

Methods: The MEDLINE, Cochrane, and Embase databases were used for data collection. As of April 2024, 2,871 studies have been identified.

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  • Balloon-based catheter ablation is an effective treatment for atrial fibrillation (AF) that creates continuous lesions for pulmonary vein isolation and relies less on the operator's skill than traditional methods.
  • * Cryoballoon ablation is widely used globally, offering comparable efficacy and safety to standard radiofrequency ablation, while hot balloon ablation, developed in Japan, produces larger lesions and features oesophageal cooling.
  • * Laser balloon ablation allows for direct visualization and automated ablation, enhancing the speed and effectiveness of achieving pulmonary vein isolation.*
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  • - The systematic review and meta-analysis assessed the effectiveness of paclitaxel-coated balloon angioplasty (PCB) for treating new lesions in patients with acute coronary syndrome (ACS) versus drug-eluting stents (DES).
  • - They analyzed nine studies involving over 2,000 cases, finding that the major adverse cardiac event (MACE) rates were similar between PCB (8.42%) and DES (10.62%) groups, with no significant differences in several health outcomes.
  • - The results suggest that PCB angioplasty is a feasible alternative to DES for managing de novo lesions in ACS patients during emergency procedures, with comparable midterm outcomes.
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  • * A study involving 91 patients undergoing RHB ablation for persistent atrial fibrillation showed significant reductions in both LA volume and EAT volume after 6 months.
  • * Both obese and non-obese patients experienced similar EAT reductions in the pulmonary vein region, and the RHB ablation produced deep lesions affecting EAT, indicating potential long-term changes, but further research is needed to understand its full impact on treatment success.
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Background: Atrial septal defect (ASD) increases the risk of adverse cardiovascular outcomes. Despite the potential for risk mitigation through minimally invasive percutaneous closure, ASD remains underdiagnosed due to subtle symptoms and examination findings. To bridge this diagnostic gap, we propose a novel screening strategy aimed at early detection and enhanced diagnosis through the implementation of a convolutional neural network (CNN) to identify ASD from 12-lead electrocardiography (ECG).

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Purpose: Isovolumic relaxation time (IVRT) is a useful indicator of diastolic dysfunction. However, a measurement method for IVRT has not been established. The Dual Gate Doppler method, which can record two separate pulse-wave Doppler signals simultaneously using two sample gates, may be ideal for measuring IVRT.

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The prognostic impact of CHADS, CHADS-VASc, and CHADS-VASc-HS scores on clinical outcomes after drug-eluting stent (DES) placement has not been fully elucidated. The present study was a retrospective, non-randomized, single-center, and lesion-based study. Target lesion failure (TLF), comprising cardiac death, non-fatal myocardial infarction, and target vessel revascularization, occurred in 7.

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  • A retrospective study was conducted to compare the effectiveness of paclitaxel-coated balloon (PCB) angioplasty versus drug-eluting stents (DESs) for treating new blockages in large coronary vessels.
  • Out of 154 patients treated, the incidence of target lesion failure (TLF) was similar between the PCB group (6.8%) and the DES group (14.6%), indicating that PCB is as effective as DESs in preventing serious cardiac events.
  • Angiographic results showed no significant cases of restenosis (re-narrowing) following PCB treatment, suggesting it may be a promising option for coronary interventions without negative outcomes.
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Background: This study investigated the impact and predictive factors of concomitant significant tricuspid regurgitation (TR) and evaluated the roles of right ventricle (RV) function and the etiology of TR in the clinical outcomes of patients with severe aortic stenosis undergoing transcatheter aortic valve implantation (TAVI).

Methods and results: We assessed grading of TR severity, TR etiology, and RV function in pre- and post-TAVI transthoracic echocardiograms for 678 patients at Keio University School of Medicine. TR etiology was divided into 3 groups: primary TR, ventricular functional TR (FTR), and atrial FTR.

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  • The study investigates the safety and effectiveness of drug-coated balloon (DCB) angioplasty compared to drug-eluting stents (DESs) for treating coronary stenosis, involving 588 patients treated between 2016 and 2019.
  • Overall target lesion failure (TLF) rates were similar between the DCB group (9.6%) and DES group (10.2%), indicating comparable clinical safety.
  • Additionally, the angiographic restenosis rates were not significantly different: DCB at 6.3% and DES at 10.1%, with late lumen enlargement identified as a predictor for better outcomes in DCB treatments.
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  • Preventing phrenic nerve injury (PNI) during balloon-based ablation is crucial, as the phrenic nerve is located near the SVC-RA junction where the ablation takes place.
  • A study compared cryoballoon ablation (CBA) and hot-balloon ablation (HBA) in patients with atrial fibrillation, revealing that CBA led to a higher incidence of transient PNI (7.3% vs 1.1%) but all cases were temporary.
  • CBA created larger and more frequent lesions at the SVC-RA junction compared to HBA, suggesting that the design and positioning of the balloon systems play a significant role in the extent of damage to surrounding structures
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  • The study explored whether fully circumferential lesions are necessary for achieving pulmonary vein isolation (PVI) during laser balloon ablation, especially considering potential complications like stenosis.
  • In a trial with 51 patients, researchers found that 39% of PVs achieved early PVIs with significantly better success in lower PVs compared to upper PVs (60.1% vs. 17.6%).
  • The results suggest that additional research is needed to understand the energy requirements for lower PVs to prevent chronic narrowing, as energy delivery was less for lower PVs yet stenosis rates were similar for both upper and lower PVs after 6 months.
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In patients with atrial septal defect (ASD), atrial left-to-right shunting causes left atrial (LA) remodeling and dysfunction, leading to atrial fibrillation (AF). In adults with ASD and concomitant AF, LA function should be evaluated after ASD closure plus AF radiofrequency catheter ablation (RFCA).This multicenter retrospective cohort study included patients who underwent transcatheter ASD closure at one of the four leading hospitals.

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  • * After CA, a significant reduction in ASD size was found in 16 patients, suggesting that the procedure may help in managing ASD.
  • * Factors like younger age and lower pressures in the heart were linked to greater reductions in ASD size, which can help shape approaches for closing the defect with less invasive methods.
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Background: Novel targeted treatments increase the need for prompt hypertrophic cardiomyopathy (HCM) detection. However, its low prevalence (0.5%) and resemblance to common diseases present challenges that may benefit from automated machine learning-based approaches.

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Transcatheter edge-to-edge repair (TEER) is becoming the standard invasive treatment for ventricular functional mitral regurgitation (MR). It is necessary to determine the severity of MR before treatment with MitraClip; however, the severity of secondary MR is usually underestimated compared with that of primary MR and varies temporally. Therefore, to accurately determine the severity of MR, it is important to correctly use the algorithm of the guidelines for valvular heart disease and aggressively perform stress echocardiography.

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Aims: Transcatheter aortic valvular replacement (TAVR) is increasingly being performed for elderly patients with aortic stenosis (AS), and current guidelines acknowledge the importance of shared decision-making in their management. This study aimed to evaluate elderly symptomatic severe AS patients' perspectives on their treatment goals and identify factors that influence their treatment choice.

Methods And Results: We performed a pre-procedural cross-sectional survey using a questionnaire at a single university hospital.

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We conducted a single-center, retrospective, lesion-based study to examine the safety and efficacy of drug-coated balloons (DCBs) for de novo coronary stenosis in patients with acute coronary syndrome (ACS) by comparing them with those of drug-eluting stents (DESs).A total of 309 consecutive lesions in patients with ACS who were successfully treated by emergent procedures using either a DCB (n = 107) or a DES between January 2016 and December 2019 were included in the study. The primary endpoint was the incidence of target lesion failure (TLF), defined as cardiac death without mortality due to ACS, non-fatal myocardial infarction, and any target lesion revascularization, including acute occlusion, after DCB use and definite stent thrombosis after DES placement.

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Background: The vertical P-wave axis on electrocardiography (ECG) is a useful criterion for screening patients with chronic obstructive pulmonary disease (COPD). This study aimed to investigate the clinical characteristics of patients with COPD with a vertical P-wave axis as they have not yet been elucidated.

Methods: Keio University and its affiliated hospitals conducted an observational COPD cohort study over 3 years.

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Patients with rare conditions such as cardiac amyloidosis (CA) are difficult to identify, given the similarity of disease manifestations to more prevalent disorders. The deployment of approved therapies for CA has been limited by delayed diagnosis of this disease. Artificial intelligence (AI) could enable detection of rare diseases.

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Background: New-onset atrial tachyarrhythmia (ATA) often develops after atrial septal defect (ASD) closure. Its development raises some potential concerns such as stroke and bleeding complications caused by anticoagulant therapy and limited access to the left atrium for catheter ablation. Although it is essential to identify the risk factors of new-onset ATA, few studies have examined these factors.

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Background: The evidence regarding triple oral combination therapy for patients with pulmonary arterial hypertension (PAH) is scarce. This study was performed to investigate the effectiveness and safety of triple oral combination therapy with macitentan, riociguat, and selexipag.

Methods: Among consecutive patients with PAH who were referred to our hospital from 2009 to 2020, those who underwent triple oral combination therapy using macitentan, riociguat, and selexipag were retrospectively analyzed.

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