BACKGROUND The mechanisms of common atrial flutter entrainment have not been directly studied in humans. METHODS AND RESULTS Endocardial mapping in six cases of common flutter showed large right atrial (RA) reentry circuits. Activation was craniocaudal in the anterolateral right atrium and caudocranial in the septum. The inferior vena cava-tricuspid isthmus (IVC-TV) closed the circuit. The hi...

Plasma toroidal rotation can limit reconnection of externally applied resonant magnetic perturbation (RMP) fields δB on rational magnetic flux surfaces. Hence it causes the induced radial perturbations δBρ to be small there, thereby inhibiting magnetic island formation and stochasticity at the top of pedestals in high (H-mode) confinement tokamak plasmas. However, the δBρs induced by RMPs incre...

If simple arbitrary modes of the form $ are used as coordmates in a win2 flutter cakdation, the equations are ill-conditioned and wm.mt be solvea satisfactorily on a simulator. This ill-conditioning can be avoided by trxmsfoming the flutter matrix so as to m&me the inertw couplings between like modes to zero. This tran.%%mation is &scribed with nmm.uxiL examples, aad some observo.t~ons are nxdo...

Acquiring good quality images of moving objects by a digital camera remains a valid question, particularly if the velocity of the photographed object is only partially known, it is virtually impossible to tune an optimal exposure time. The same question arises when a solid object is being photographed by a moving camera. This is not only frequent, but even necessary when the camera is embarked ...

OBJECTIVES We sought to investigate the imaging of the left atrial (LA) muscular bundle and the relationship between the bundle and inducibility of tachyarrhythmia after pulmonary vein isolation (PVI). BACKGROUND Noninducibility is used as a clinical end point of atrial substrate ablation after PVI. However, little is known about the role of the LA muscular bundles in tachyarrhythmia after PV...

I read with interest the article by David et al. regarding a case of recurrent tachycardia-induced cardiomyopathy secondary to typical atrial flutter. I have some concerns regarding the management of the recurrences of atrial flutter and tachycardiainduced cardiomyopathy in this case. The authors’ choice of treatment involved DC cardioversion of the atrial flutter that was successful in restori...

The congenital type of atrial flutter has a poor prognosis when unresponsive to digoxin (Moller, Davachi, and Anderson, 1969). Recorded experience with cardioversion is limited but it has been suggested that this type of flutter is refractory to electric countershock (Rodriguez-Coronel, Sueblingvong, and Hastreiter, 1968). We report an infant with congenital heart defects and congenital atrial ...

Palpitations are a symptom often reported by patients with apical hypertrophic cardiomyopathy (HCM), yet the arrhythmias associated with this type of HCM have not been studied adequately. Herein, a case of persistently recurrent atrial flutter in a 63-year-old Greek man with apical HCM is presented. Synchronized direct-current shocks were used twice during his hospitalization in order to conver...

This 12-lead electrocardiogram (ECG) is of a 69 year-old man with Parkinson’s disease. On initial inspection, the rhythm appears to be that of atrial flutter, with negatively directed flutter waves in the inferior leads (Fig. 1A, grey arrow), consistent with cavo-tricuspid isthmus dependent flutter. These waves present a cycle length of approximately 200 ms and are best visualized in leads I, I...

OBJECTIVES This study sought to study the change in autonomic tone that precedes the initiation of paroxysmal atrial flutter. BACKGROUND An abrupt change in the autonomic tone of the heart is an important initiating factor in the pathogenesis of ventricular tachyarrhythmias and paroxysmal atrial fibrillation. Whether the autonomic tone has a role in the initiation of paroxysmal atrial flutter...