A5048313943- Advanced Wireless Communication Techniques
- Atrial Fibrillation Management and Outcomes
- Wireless Communication Networks Research
- Cardiac Arrhythmias and Treatments
- Cardiac electrophysiology and arrhythmias
- Cardiac pacing and defibrillation studies
- Advanced MIMO Systems Optimization
- Error Correcting Code Techniques
- Mercury impact and mitigation studies
- Cooperative Communication and Network Coding
- Satellite Communication Systems
- PAPR reduction in OFDM
- Advanced Wireless Network Optimization
- Coding theory and cryptography
- Cardiac Imaging and Diagnostics
- Venous Thromboembolism Diagnosis and Management
- Optical Network Technologies
- Advanced Adaptive Filtering Techniques
- Cardiovascular Function and Risk Factors
- Blind Source Separation Techniques
- Heart Rate Variability and Autonomic Control
- ECG Monitoring and Analysis
- Health Systems, Economic Evaluations, Quality of Life
- Cardiovascular Syncope and Autonomic Disorders
- Advanced Wireless Communication Technologies
Toho University
2016-2025
Japanese Circulation Society
2022
Policlinico Casilino
2020
Yokosuka Kyosai Hospital
2009-2018
Teikyo University Hospital
2017
Tokyo Medical and Dental University
1982-2014
University of Electro-Communications
2004-2013
Osaka University
1987-2013
Osaka City University
2013
Yonsei University
2013
The anatomy and pathology of the choroidal vasculature in human eyes has been studied using intravascular injection techniques, conventional histologic cross sections, flat preparations choroid. Interarterial anastomotic relationships are demonstrated as anatomic features choriocapillaris vortex veins. pathologic changes ageing, hypertension, glaucoma observed. Round holes Bruch's membrane at posterior pole regularly present from healthy adult eyes. It is suggested that these defects...
Although catheter ablation (CA) is a standard treatment for atrial fibrillation (AF), its long-term efficacy remains unclear. This study aimed to elucidate the incidences of AF recurrence and progression from paroxysmal persistent AF, after CA, in patients with AF.We examined incidence 1220 consecutive (mean age, 61 years), symptomatic undergoing based on extensive pulmonary vein isolation focal nonpulmonary foci. recurrence-free survival probabilities at 5 years were 59.4% initial CA 81.1%...
This study aimed to elucidate the clinical characteristics and management of periesophageal vagal nerve injury complicating ablation atrial fibrillation (AF).A total 3,695 patients with drug-resistant AF underwent extensive pulmonary vein isolation at our institution. Either a nonirrigated or an irrigated catheter was employed, radiofrequency power 25-40 W. Esophageal temperature monitored in 3,538 patients: when esophageal reached 42°C delivery stopped. A 11 (60 ± years, 10 males) were...
This paper proposes an adaptive maximum-likelihood sequence estimator (MLSE), which is a suboptimum approximation to the detector and capable of tracking fast time-varying intersymbol interference (ISI) channels. The MLSE consists channel implemented by Viterbi algorithm (VA). novel feature proposed estimation scheme, where accomplished for each state in VA along surviving path connected state. makes it possible estimate impulse response without influence decision delay inherent VA,...
During anticoagulation for prevention of stroke in patients with non-valvular atrial fibrillation (NVAF), bleeding is the most serious complication. In Western countries, incidences major and intracranial hemorrhages low-dose warfarin are known to occur at a rate 0.4-1.3% 0.2% per year, respectively. The purpose this study was investigate incidence risk factors related therapy Japanese NVAF.From August 2004 July 2005, 667 NVAF treated were followed-up. target prothrombin time-international...
Kidney function is a known predictor of cardiovascular morbidity and mortality. Although patients with atrial fibrillation (AF) often have kidney dysfunction, less about the association between AF function. We sought to assess changes in after catheter ablation AF.Patients who underwent were recruited for present prospective study. Estimated glomerular filtration rate (eGFR) was evaluated before 1 year ablation. Three hundred eighty-six (paroxysmal AF, 135; persistent 106; longstanding 145)...
This study aimed to elucidate the clinical characteristics of massive air embolism occurring during atrial fibrillation (AF) ablation.Of 2976 patients undergoing AF ablation, 5 complicated by serious were examined. Atrial ablation was performed with use three long sheaths for circular mapping and catheters under conscious sedation. Two had spontaneously introduced through a haemostasis valve sheaths, at end apnoea caused sedation, even though placed within sheaths. The remaining patients,...
Circulatory dynamics and pathology of occlusion the central retinal vein was compared at two sites in owl monkey eye. In 17 eyes, neoprene occluded disc and, ten tied cut as it emerged from optic nerve. The first group animals demonstrated rapid ischemic hemorrhagic infarction retina obstruction arterial flow by fluorescein angiography. second a temporary reversible increase venous congestion without secondary damage to Collateral circulation region posterior explains best difference groups....
ABSTRACT Introduction The docking button of the Aveir leadless pacemaker (LP) is occasionally difficult to access due its inappropriate position in right ventricle (RV). Methods and Results We report a case where LP was successfully retrieved by releasing wedged inferior wall RV using loop wire technique. Conclusion technique may be useful change LP. This helpful retrieve even RV.
Recently, some clinicians have been diagnosing and treating arrhythmias on the basis of electrocardiogram (ECG) devices with low accuracy. In Europe US, several statements use ECGs already published by related academic societies. addition, relaxation regulations media advertising ambulatory/wearable ECG devices, frequency simple general public will increase in future. Therefore, this statement describes functions features non-invasive ambulatory or wearable that approved as medical Japan...
Sustained tachycardia causes left ventricular (LV) systolic dysfunction leading to heart failure (HF), which is widely known as "tachycardia-induced cardiomyopathy (TIC)", but its prevalence and prognosis in Japanese remain unclear.Of 213 consecutive patients with HF associated atrial fibrillation (AF) requiring hospitalization (n=213) between January 1999 December 2004, 104 (83 males, 67+/-12.6 years) were identified not having any structural disease. Of them 41 (39%) had a normal LV...
Flutter 89 4. Ventricular Tachycardia 5. Inherited Arrhythmias 90 6.Bradycardia
The purpose of diagnosing arrhythmia is to improve symptoms, quality life (QOL), and prognosis by preventing sudden cardiac death that caused fatal ventricular arrhythmias. Organic heart disease, such as myocardial infarction, accounts for the majority etiologies, whereas inherited diseases, Brugada syndrome, are also involved. Risk assessment using various test methods can help prevent a certain degree. Syncope precursor death, diagnosis arrhythmic syncope lead prevention death....
Background: Mapping of recurrent atrial tachycardia (AT) after extensive ablation for long‐lasting persistent fibrillation (AF) is complex. We sought to describe the electrophysiological characteristics localized reentry occurring AF. Methods: Out 70 patients undergoing catheter AF, 9 (13%, 55 ± 8 years, males) in whom was demonstrated a repeat were studied. Localized defined as which circuit small area and did not have central obstacle. The mechanism AT determined by electroanatomical...
A low incidence of thromboembolic events after successful catheter ablation atrial fibrillation (AF) during a mid-term follow-up period was recently reported. However, because the such over long term is unknown, we investigated late ablation.Patients with paroxysmal and persistent AF undergoing being followed up for at least 24 months formed study group (n = 524); 82 patients (16%) had CHADS₂ scores 2. Mean 44 ± 13 months. Warfarin discontinued in 400 (93%) 429 (82% 524 patients) without...
The alterations of the electroretinogram (ERG) induced by elevations intraocular pressure were not due to alone but secondary blood flow into eye because (1) consistent changes could be obtained only when was related pressure, (2) significant depression ERG did occur until exceeded diastolic and (3) time course similar that observed is blocked.
Late potentials (LP) detected with signal-averaged ECGs are known to be useful in identifying patients at risk of Brugada syndrome (BS) and arrhythmogenic right ventricular cardiomyopathy (ARVC). Because the pathophysiology is clearly different between these disorders, we clarified LP characteristics disorders.This study included 15 BS 12 ARVC 20 healthy controls. All had characteristic ECG changes symptomatic episodes. findings that were consistent recent criteria. Three parameters...
Background— We sought to characterize patients with persistent atrial fibrillation (AF) who were successfully treated by ablation targeting the left atrium (LA). Methods and Results— Ninety-three (58±10 years, 79 male) undergoing of AF studied. During first procedure, was performed in LA coronary sinus, consisting pulmonary vein isolation, linear ablation, electrogram-based ablation. follow-up after 35 (38%) remained free from tachyarrhythmias, 27 (29%) had tachycardia, 31 (33%) AF. Duration...