Yoshihide Takahashi

..We sought to describe the electrophysiological characteristics of localized reentry occurring after ablation of long-lasting persistent AF...

..This study sought to evaluate the effects of stepwise catheter ablation of chronic atrial fibrillation (AF) on atrial electrical and mechanical properties...

..We sought to characterize patients with persistent atrial fibrillation (AF) who were successfully treated by ablation targeting the left atrium (LA)...

..Although patients with atrial fibrillation (AF) often have kidney dysfunction, less is known about the association between AF and kidney function. We sought to assess changes in kidney function after catheter ablation of AF...

..This study sought to determine the characteristics of atrial electrograms predictive of slowing or termination of atrial fibrillation (AF) during ablation of chronic AF...

..The aim of the present study was to assess the feasibility of identifying sites of focal atrial activity by localized high-density endocardial mapping during atrial fibrillation (AF)...

..Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported...

..To evaluate the contribution of the posterior left atrium (LA) to chronic atrial fibrillation (AF)...

..There are no reports describing the technique, electrophysiological evaluation, and clinical consequences of complete linear block at roofline joining the superior pulmonary veins (PVs) in patients with paroxysmal atrial fibrillation (AF)...

..The objective of this study was to evaluate whether the response to adenosine predicts atrial fibrillation (AF) recurrence after a single ablation procedure in patients with paroxysmal AF...

..However, achievement of complete conduction block remains challenging and conduction recovery is commonly observed. The aim of the study was to investigate the localization of gap sites of recovered LA linear lesions...

..The goal of this study was to characterize the origin of focal atrial tachycardias (AT)...

..The clinical outcome and subsequent arrhythmia recurrence after using an ablation method targeting multiple left atrial sites with the aim of achieving acute AF termination has not been characterized...

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..Noninducibility of AF has been shown to be associated with freedom from arrhythmia in 87% of patients...

..This study evaluated the impact of catheter ablation of the coronary sinus (CS) region during paroxysmal and persistent atrial fibrillation (AF)...

..For 6 months after the elimination of that dormant PV conduction, the patient has been free of any AT. Evaluation of dormant PV conduction was effective in curing the recurrent AT after PVI...

..While being effective in the termination of AF, this configuration of linear lesions is technically challenging to complete, results in significant delayed LA activation, and is associated with modest long-term arrhythmia suppression...

..We evaluated the acute achievement of electrical PV isolation using this approach. In addition, the consequences of wide encircling of the PVs with isolation were assessed...

..The goal of the present prospective study is to evaluate the impact of vagal excitation on ongoing atrial fibrillation (AF) during pulmonary vein (PV) isolation...

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..This observational study describes regions of fibrillating atrial tissue isolated inadvertently from the left atrium (LA) following linear catheter ablation for AF...

..Despite continued treatment, a high rate of AF recurrence after pharmacological cardioversion (PC) with bepridil has been reported. Bepridil therapy is also associated with significant adverse effects...

..Catheter stability and optimal wall contact, in combination with HR electrograms can optimize circumferential PV mapping during AF and improve the discrimination of FFP postablation...

..Areas of complex fractionated atrial electrograms (CFAEs) have been implicated in the atrial substrate of atrial fibrillation (AF). The mechanisms underlying CFAE in humans are not well investigated...

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..The objective of this study was to identify the simple preprocedural parameters of atrial fibrillation (AF) recurrence following single ablation procedure in patients with paroxysmal AF during long-term follow-up period...

..The current study aims to compare the contribution of PV activity to the maintenance of paroxysmal and permanent AF...

..The current study aimed to investigate the effect of ablation therapy on the quality of life (QOL) in patients with atrial fibrillation (AF) by using a questionnaire specific for AF...

..Whether arrhythmia termination during ablation is associated with an improved clinical outcome is controversial...

..Ablation at these sites results in prolongation of the AFCL and termination of paroxysmal AF, indicating their role in the maintenance of AF...

..The relative contributions of different atrial regions to the maintenance of persistent atrial fibrillation (AF) are not known...

..This study aimed to elucidate the clinical characteristics of massive air embolism occurring during atrial fibrillation (AF) ablation...

..There was no procedural complication. The use of this new nonfluoroscopic imaging system was associated with a shorter fluoroscopic exposure as well as a trend toward shorter duration of linear ablation procedures for AF...

..CONCLUSION: This prospectively randomized study demonstrates significant reduction of fluoroscopy exposure and procedural duration using supplementary non-fluoroscopic imaging system for AF ablation...

..AF Ablation in Patients With Valvular Heart Disease...

..We evaluated the role of clinical variables that could predict noninducibility of sustained AF after PVI...

..To examine the long-term clinical outcomes of patients undergoing catheter ablation (CA) for either paroxysmal (PAF) or persistent atrial fibrillation (PsAF) using an extensive pulmonary vein isolation (EPVI)-based strategy...

..Risk of tamponade was highest during linear ablation, mainly associated with high energy delivery and "popping." Reducing the energy limited, though did not eliminate this complication...

..Left atrial appendage (LAA) is implicated in maintenance of atrial fibrillation (AF) and atrial tachycardia (AT) associated with persistent AF (PsAF) ablation, although little is known about the incidence and mechanism of LAA AT...

..We describe the case of a patient with paroxysmal AF demonstrating PVT within an isolated PV with high-density mapping revealing two different PVTs interacting in a "ping-pong" manner...

..Differential inflammatory response to stent implantation between the de novo plaque and in ISR lesion is related to lesion morphology...

..The modification of atrial fibrillation cycle length (AFCL) during catheter ablation in humans has not been evaluated...

..Emerging evidence implicates triggers originating predominantly from the distal Purkinje arborization and the right ventricular outflow tract...

..This study sought to assess predictive values of coronary flow velocity and an index of shear stress throughout the vessel for angiographic restenosis after sirolimus-eluting stent implantation...

..The purpose of this study was to characterize the occurrence of phrenic nerve injury (PNI) and its outcome after radiofrequency (RF) ablation of atrial fibrillation (AF)...

..We report a case with paroxysmal atrial fibrillation, in whom multiple foci were identified in the left atrial appendage after pulmonary vein isolation. The patient was successfully treated by catheter ablation to disconnect this structure...

..At present, an implantable cardioverter-defibrillator (ICD) is the recommended therapy in high-risk patients. This multicenter study reports the outcome of a large series of patients implanted with an ICD for Brugada syndrome...

..9-6%, have been reported. It is important to understand the incidence, prevention and management of complications in order to develop safe ablation strategies...

..However, the presence of electrical connections between the PVs, which may make achievement of PV disconnection difficult, has not been systematically evaluated...

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..The patient had electrical connection between the LSPV and LIPV, and required radiofrequency ablation of the breakthroughs from the LA to LIPV for complete isolation of the LSPV...

..The purpose of this study was to evaluate a possible correlation between atrial ECG amplitude in common atrial flutter (AFL) and radiofrequency (RF) energy required to achieve cavotricuspid isthmus block...

..To test this hypothesis, we evaluated the frequency spectra in patients with paroxysmal AF in relation to catheter ablation...

..We describe the role of nonablated anterior left atrium (LA) in arrhythmias observed after AF ablation...

..The aim of this study was to investigate the inducibility and the mechanism of sustained PV tachycardia (SPVT)...

..The stepwise approach benefits from the integration of anatomic and electrophysiologic information to achieve a high level of success in termination of chronic AF by catheter ablation...

..01). In conclusion, APT has beneficial hemodynamic effects, and plasma BNP levels can predict the most optimal candidates for ablation and pacing therapy...

..Classical protection with lead aprons results in discomfort while radioprotection is still incomplete. This study evaluated the usefulness of a radiation protection cabin (RPC) that completely surrounds the operator...

..This prospective, randomized study compares the clinical efficacy of 8-mm gold tip catheter, externally irrigated and 8-mm platinum-iridium tip (Pt tip) catheters...