The mechanisms of supraventricular tachycardia were investigated in 35 children. Intracardiac electrograms including His bundle potentials were recorded. Atrial pacing and single premature atrial stimuli were performed in the right atrium. Tachycardia was observed and the mechanism elucidated in 33 patients. The atrial activation sequence during tachycardia, including high right atrium, low lat...

TOPIC: Cardiovascular Disease TYPE: Global Case Reports INTRODUCTION: Enlarged LA is a common finding in severe mitral stenosis(MS) and regurgitation(MR). It can enlarge to giant proportions. The unusual thirty-year-old woman presenting with only mild dyspnea despite hugely dilated prompted us report this case CASE PRESENTATION: A presented the outdoor clinic complaint of on exertion NYHA class...

Spontaneous action potentials were monitored from multiple sites in the bullfrog atrium using a voltage-sensitive merocyanine-rhodanine dye together with a 100-element photodiode matrix array, and we have assessed the spread of the excitation from the pacemaker. Isochrone curves of conduction were obtained by timing the initiation of the action potential-related optical signals: we constructed ...