Search results for: Osamu Inaba

Items from 1 to 19 out of 19 results

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Acute procedural efficacy and safety of a novel expandable diameter cryoballoon in atrial fibrillation ablation: Early results from a multicenter ablation registry

Yuhei Isonaga, Shinsuke Miyazaki, Junichi Nitta, Yasuhiro Shirai, more

Journal of Cardiovascular Electrophysiology > 35 > 1 > 198 - 205

Introduction The major limitation of the current cryoballoon (CB) system is a fixed 28 mm balloon‐size. We sought to analyze real‐world early experience with novel‐sized adjustable CB. Methods This multicenter observational study included 140 consecutive atrial fibrillation patients (71 years, 94 men, 86 paroxysmal) who underwent pulmonary vein (PV) isolation using expandable diameter CB capable...

article

Impact of diagnosis‐to‐ablation time on non‐pulmonary vein triggers and ablation outcomes in persistent atrial fibrillation

Tomomasa Takamiya, Junichi Nitta, Osamu Inaba, Akira Sato, more

Journal of Cardiovascular Electrophysiology > 32 > 5 > 1251 - 1258

Introduction Non‐pulmonary vein (PV) triggers are a major cause of atrial tachyarrhythmia (ATA) recurrence after catheter ablation. However, the effect of the diagnosis‐to‐ablation time (DAT) on non‐PV triggers in persistent atrial fibrillation is unknown. Methods and Results This observational study evaluated 502 consecutive persistent AF patients who underwent initial ablation. We compared 408...

article

Comparison of dragging ablation and point‐by‐point ablation with a laser balloon on linear lesion formation

Takahiko Nagase, Atsushi Kobori, Osamu Inaba, Yasuhiro Sasaki, more

Journal of Cardiovascular Electrophysiology > 31 > 11 > 2848 - 2856

Introduction Lesion size and continuity in dragging laser balloon (LB) ablation, which may enable fast and durable pulmonary vein isolation for atrial fibrillation, are unknown. We evaluated the differences in size and continuity of linear lesions formed by dragging ablation and conventional point‐by‐point ablation using an LB in vitro model. Methods and Results Chicken muscles were cauterized...

article

Radiofrequency or cryoballoon ablation for index pulmonary vein isolation: What is the impact on long‐term clinical outcomes after repeat ablation?

Osamu Inaba, Andreas Metzner, Laura Rottner, Shibu Mathew, more

Journal of Cardiovascular Electrophysiology > 31 > 5 > 1068 - 1074

Aims The current study sought to assess the impact of the utilized energy source during index ablation on long‐term clinical outcomes after repeat ablation of atrial fibrillation (AF). Index ablation procedures were either performed using radiofrequency current (RFC) (RFC group) or cryoballoon (CB) ablation (CB group). Repeat ablation was performed by the use of RFC. Methods A total of 195 patients...

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Characteristics of the nonpulmonary vein foci induced after second‐generation cryoballoon ablation for paroxysmal atrial fibrillation

Nobutaka Kato, Junichi Nitta, Akira Sato, Yukihiro Inamura, more

Journal of Cardiovascular Electrophysiology > 31 > 1 > 174 - 184

Introduction Pulmonary vein isolation (PVI) using cryoballoon is effective for patients with paroxysmal atrial fibrillation (PAF); however, few reports have evaluated the non‐pulmonary vein (PV) foci after cryoballoon ablation. We aimed to evaluate the characteristics of non‐PV foci and predictors of atrial fibrillation (AF) recurrence after cryoballoon ablation. Methods and Results This was a...

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Differences in the electrophysiological findings of repeat ablation between patients who first underwent cryoballoon ablation and radiofrequency catheter ablation for paroxysmal atrial fibrillation

Yukihiro Inamura, Junichi Nitta, Osamu Inaba, Toshikazu Kono, more

Journal of Cardiovascular Electrophysiology > 30 > 10 > 1792 - 1800

Introduction Several studies have revealed that second‐generation cryoballoon (CB)‐based pulmonary vein (PV) isolation is noninferior to radiofrequency (RF)‐based PV isolation for patients with drug‐refractory paroxysmal atrial fibrillation (AF). However, electrophysiological differences in repeat ablation remain unclear. Methods and Results This study examined electrophysiological differences...

article

Identification of an epicardial slow conduction channel using ripple mapping in ablation of postinfarct ventricular tachycardia

Tomomasa Takamiya, Osamu Inaba, Junichi Nitta, Masahiko Goya

Journal of Cardiovascular Electrophysiology > 30 > 7 > 1156 - 1158

An 82‐year‐old man underwent redo catheter ablation of ventricular tachycardia (VT) after anterior infarction. A ripple mapping conducting channel (RMCC) was identified within the anterior scar in the left ventricular epicardium during sinus rhythm. Along the RMCC, delayed potentials during sinus rhythm, a good pace map with a long stimulus to the QRS interval, and mid‐diastolic potentials during...

article

Left atrial anterior line ablation using ablation index and inter-lesion distance measurement

Francesco Santoro, Andreas Metzner, Natale Daniele Brunetti, Christian-H Heeger, more

Clinical Research in Cardiology > 2019 > 108 > 9 > 1009-1016

Background Ablation index (AI) is a novel ablation quality marker that incorporates contact force (CF), time and power in a weighted formula to provide accurate information about lesion formation during catheter ablation. This index has been evaluated for pulmonary vein isolation (PVI) but has not been systematically used for other left atrial (LA) procedures so far. The aim of this study is to evaluate...

article

Prognostic significance of ventricular tachycardia clustering after catheter ablation in non-ischemic dilated cardiomyopathy

Francesco Santoro, Andreas Metzner, Leonie Scholz, Natale Daniele Brunetti, more

Clinical Research in Cardiology > 2019 > 108 > 5 > 539-548

Background Ventricular tachycardia clustering (VTc) is associated with a worse clinical outcome in patients with non-ischemic dilated cardiomyopathy (NI-DCM) and implantable cardioverter defibrillator (ICD); however, its role after catheter ablation (CA) has still not been investigated. Aim of this study was to evaluate the prognostic significance of VTc after CA. Methods 96 consecutive patients...

article

Coexistence of a permanent form of a junctional reciprocating tachycardia and coronary sinus aneurysm: A case report

Yuki Shimizu, Osamu Inaba, Masahiko Goya, Kenzo Hirao

Pacing and Clinical Electrophysiology > 40 > 11 > 1318 - 1321

A 58‐year‐old man with a long R‐P' narrow QRS tachycardia underwent an electrophysiological study. The tachycardia was diagnosed as a permanent form of junctional reciprocating tachycardia (PJRT), and the earliest atrial activation site during tachycardia was coronary sinus (CS) ostium. Radiofrequency ablation at the site was initially not successful because the tip impedance and temperature were...

article

A new mapping method to estimate exit sites of ventricular arrhythmias using intracardiac echocardiography and M-mode for catheter ablation

Osamu Inaba, Junichi Nitta, Syunsuke Kuroda, Masahiro Sekigawa, more

Journal of Arrhythmia > 2017 > 33 > 5 > 440-446

Catheter ablation of premature ventricular complexes (PVCs) has been used as a curative therapy in many cases. Intracardiac ultrasound with a magnetic sensor probe has recently become available for catheter ablation. In this study, we assessed a new mapping method, contraction mapping, for determining the optimal ablation sites using intracardiac ultrasound and M-mode. This study sought to assess...

article

Radiocaesium contamination and dose rate estimation of terrestrial and freshwater wildlife in the exclusion zone of the Fukushima Dai-ichi Nuclear Power Plant accident

Shoichi Fuma, Sadao Ihara, Hiroyuki Takahashi, Osamu Inaba, more

Journal of Environmental Radioactivity > 2017 > 171 > C > 176-188

To characterise the radioactive contamination of terrestrial and freshwater wildlife caused by the Fukushima Dai-ichi Nuclear Power Plant accident, biological samples, namely, fungi, mosses, plants, amphibians, reptiles, insects, molluscs, and earthworms, were collected mainly from the forests of the exclusion zone in the Fukushima Prefecture from 2011 to 2012. Caesium-134 and ¹³⁷Cs were detected...

article

Factors and values at admission that predict a fulminant course of acute myocarditis: data from Tokyo CCU network database

Osamu Inaba, Yasuhiro Satoh, Mitsuaki Isobe, Takeshi Yamamoto, more

Heart and Vessels > 2017 > 32 > 8 > 952-959

Prognosis of acute myocarditis is generally benign, but fulminant cases exist which require advanced life support devices, such as percutaneous cardio-pulmonary support (PCPS) and ventricular assist devices (VAD), and lead to fatal outcomes. The purpose of this study was to identify predictors and their values at admission which might foreshadow a fulminant course of myocarditis. Data from 138 patients...

article

Predictive Factors and Immune-related Therapies for Fulminant Myocarditis. Data from Tokyo CCU Network Registry

Osamu Inaba, Yasuhiro Satoh, Mitsuaki Isobe, Takeshi Yamamoto, more

Journal of Cardiac Failure > 2015 > 21 > 10 Supplement > S154

article

The prospect for Catheter Ablation to Atrial Fibrillation by Plasma Brain Natriuretic Peptide

Akira Sato, Junichi Nitta, Miki Kanou, Shinsuke Iwai, more

Journal of Cardiac Failure > 2011 > 17 > 9 Supplement > S156-S157

article

Role of oral amiodarone in patients with atrial fibrillation and congestive heart failure

Mihoko Kawabata, Kenzo Hirao, Hitoshi Hachiya, Kouji Higuchi, more

Journal of Cardiology > 2011 > 58 > 2 > 108-115

Amiodarone is recognized as the most effective therapy for maintaining sinus rhythm (SR) post cardioversion in patients with atrial fibrillation (AF). It is also recommended for controlling AF in patients with congestive heart failure (CHF). We retrospectively examined the efficacy and safety of oral amiodarone in patients with AF and CHF.Forty-eight consecutive AF patients whose left ventricular...

article

Frequency, Clincal Features and Prognosis of Myocarditis in the Suburbun Hospitals Around Tokyo

Osamu Inaba, Yasuhiro Satoh, Mitsuaki Isobe

Journal of Cardiac Failure > 2010 > 16 > 9 Supplement > S167-S168

article

Cardiac Resynchronization Therapy for a Patient With Severe Congestive Heart Failure Depending on Both IABP and Catechoramine

Osamu Inaba, Kenzo Hirao, Hitoshi Hachiya, Koji Higuchi, more

Journal of Cardiac Failure > 2010 > 16 > 9 Supplement > S175

article

Quantitative evaluation of acute mucosal reaction to interstitial brachytherapy using color histograms

Ken Yoshida, Takayuki Nose, Yoshiyuki Watanabe, Yukiko Tokuda, more

Brachytherapy > 2005 > 4 > 4 > 298-303

Color histograms of tongue photographs were used to make a quantitative evaluation of acute mucosal reaction to high-dose-rate fractionated interstitial brachytherapy.Six patients with oral cavity cancer were analyzed with two methods (color histogram and vinyl plate). Using a photograph of the tongue, we calculated the histogram of each pixel of 1mm ² of the tongue surface. The results were...

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