Toon Wei Lim

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BACKGROUND Wide electrical pulmonary vein isolation (PVI) with two separate rings of ablation requires extensive ablation on the posterior left atrial wall close to the esophagus. OBJECTIVE The purpose of this study was to determine the feasibility of PVI using a single ring of radiofrequency ablation lesions. METHODS Irrigated-tip ablation catheters,(More)
BACKGROUND Single-ring isolation of the posterior left atrium is feasible, but the incidence and mechanisms of postprocedural arrhythmias have not been described in detail. METHODS AND RESULTS The first 100 consecutive patients (58.8+/-11.2 years old, 80 male) who underwent single-ring isolation for atrial fibrillation (66 intermittent, 18 persistent, 16(More)
BACKGROUND Electric isolation of the pulmonary veins and posterior left atrium with a single ring of radiofrequency lesions (single-ring isolation [SRI]) may result in fewer atrial fibrillation (AF) recurrences than wide antral pulmonary vein isolation (wide antral isolation [WAI]) by abolishing extravenous AF triggers. The effect of mitral isthmus line(More)
AIMS Early atrial arrhythmia following atrial fibrillation (AF) ablation is associated with higher recurrence rates. Few studies explore the impact of early AF (EAF) and atrial tachycardia (EAT) on long-term outcomes. Furthermore, EAF/EAT have not been characterized after wide pulmonary vein isolation. We aimed to characterize EAF and EAT and its impact on(More)
INTRODUCTION Previous studies suggest that segmental ostial isolation of the pulmonary veins for the treatment of patients with persistent and permanent atrial fibrillation is associated with a high rate of recurrence. Recurrence of atrial fibrillation is usually associated with electrical reconnection of the pulmonary veins to the left atrium. METHODS We(More)
INTRODUCTION Long side-firing microwave (MW) arrays can deliver energy uniformly over its length without the need for intimate endocardial contact. We hypothesize that a novel 6 Fr 20 mm long percutaneous high-efficiency MW antenna array ablation catheter can rapidly create long, continuous, and transmural linear ablation lesions. METHODS AND RESULTS(More)
INTRODUCTION Pulmonary tuberculosis (PTB) is prevalent in our population. We report an incident of healthcare workers (HCWs) suspected of being infected by a patient with undiagnosed active PTB in the operating theatre. CLINICAL PICTURE A 60-year-old patient admitted for intestinal obstruction, underwent an emergency laparotomy. Preoperative chest X-ray(More)
BACKGROUND Radiofrequency (RF) ablation causes thermal mediated irreversible myocardial necrosis. This study aimed to (i) characterize the thermal characteristics of RF ablation lesions with high spatial resolution using a thermochromic liquid crystal (TLC) myocardial phantom; and (ii) compare the thermochromic lesions with in vivo and in vitro ablation(More)
BACKGROUND Late recurrence of atrial fibrillation (AF) after radiofrequency ablation remains significant. Asymptomatic recurrence poses a difficult clinical problem as it is associated with an equally increased risk of stroke and death compared with symptomatic AF events. Meta-analyses reveal that no single preablation patient characteristic efficiently(More)