30 research outputs found
Electroanatomically estimated length of slow pathway in atrioventricular nodal reentrant tachycardia
Characteristics of systolic and diastolic potentials recorded in the left interventricular septum in verapamil-sensitive left ventricular tachycardia
We studied the electrophysiological characteristics of systolic (SP) and diastolic (DP) potentials recorded during sinus rhythm (SR) in the left interventricular septum of a 27 year-old woman presenting with verapamil-sensitive idiopathic left ventricular tachycardia (VT). During SR, and during VT, SP was activated from ventricular base-to-apex, and DP from apex-to-base. SP and DP were both detected at the site of successful ablation during SR, whereas during VT, DP was detected away from the earliest activation site. Thus, SP apparently reflected a critical component of the reentrant circuit, while DP reflected the activation of a bystander pathway
Irregular atrial flutter following pulmonary vein isolation for persistent atrial fibrillation
AbstractA 65-year-old man with a history of refractory paroxysmal atrial fibrillation (AF) underwent catheter ablation for persistent AF lasting 2 months. AF was not terminated after complete isolation of the 4 pulmonary veins (PV). Instead, it was transformed to a sustained atrial tachyarrhythmia with beat-to-beat variability in the atrial cycle length. A 12-lead electrocardiogram during tachycardia showed negative flutter-like waves in the inferior leads. Entrainment pacing along the tricuspid annulus confirmed the diagnosis of irregular cavotricuspid isthmus (CTI)-dependent typical atrial flutter (AFL). Linear ablation of the CTI terminated AFL and restored sinus rhythm
Typical atrial flutter with atypical flutter wave morphology due to abnormal interatrial conduction
We report a case of typical counterclockwise atrial flutter (AFL) with conduction block from
right to left atrium along the coronary sinus (CS) musculature, confirmed by discontinuous
CS activation sequence during pacing near the ostium and differential right atrial pacing.
AFL was associated with an atypical flutter wave morphology, due to the detour of the activation
wavefront from right to left atrium via alternate interatrial electrical connections, such as
Bachmann’s bundle, the interatrial septum, or both. (Cardiol J 2011; 18, 4: 450–453