We report the case of an asymptomatic 78-year-old woman in whom incessant atrial tachycardia refractory to many pharmacological treatments appeared. Months after the appearance of atrial tachycardia, clinical neurological symptoms of a cerebral cystic tumor appeared. Treatment of the tumor resolved the rhythm disorder.

Supraventricular tachycardia in an isolated rabbit heart preparation was repeatedly initiated and terminated by carefully timed atrial premature beats. Transmembrane action potentials of AV nodal cells were recorded simultaneously by a "brush electrode" consisting of 10 microelectrodes. Surface electrograms of atrium and His bundle were also recorded. The moments of activation of 54 different A...

Introduction Wide complex tachycardias have a broad differential diagnosis including ventricular tachycardia (VT), antidromic reciprocating tachycardia (ART), supraventricular tachycardia (SVT) with aberrancy, atrial tachycardia (AT) or atrioventricular nodal reentry tachycardia (AVNRT) with a bystander accessory pathway, or unusual tachycardias involving nodoventricular or atriofascicular path...

BACKGROUND Heart rate (HR) variability reflects the neural regulation of normal pacemaker tissue, but the autonomic nervous regulation of abnormal atrial foci originating outside the sinus node has not been well characterized. We compared the HR variability of tachycardias originating from the ectopic foci and the sinus node. METHODS AND RESULTS R-R-interval variability was analyzed from 24-h...

OBJECTIVES The purpose of this prospective study was to quantitate the diagnostic value of several tachycardia features and pacing maneuvers in patients with paroxysmal supraventricular tachycardia (PSVT) in the electrophysiology laboratory. BACKGROUND No study has prospectively compared the value of multiple diagnostic tools in a large group of patients with PSVT. METHODS One hundred ninet...

Ingredients: Sotalol Hydrochloride. Indications: Arrhythmia, ventricular; Tachycardia, ventricular; Arrhythmia, atrial fibrillation; Arrhythmia, atrial flutter. Off-label Indications: Clinically relevant: Angina Pectoris, Chronic; Hypertension; Myocardial Infarction; Pheochromocytoma; Not clinically relevant: Cardiomyopathy, Hypertrophic; Tachycardia, Supraventricular; Anxiety; Mitral Valve Pro...

A patient with Wolff-Parkinson-White syndrome was disabled by rapid ventricular rates during atrial arrhythmia and by periods of asystole. Circus tachycardia was induced by atrial stimulation only after the administration of procainamide. Nevertheless, treatment with this drug controlled the ventricular rate and spontaneous circus tachycardia did not occur.

We report an unusual association of persistent atrial flutter and bundle branch re-entrant ventricular tachycardia in a young patient without structural heart disease. Atrial flutter masked the infra-Hisian conduction disease, was fundamentally dependent on a long PR interval, and could be a possible trigger of ventricular tachycardia.

A 32-year-old man underwent catheter ablation of an orthodromic atrioventricular reentrant tachycardia. The sinus rhythm electrocardiogram exhibited a normal PQ interval and no delta waves, but atrial pacing produced a prolonged PQ interval and wide QRS morphology with right bundle-branch block due to antegrade accessory pathway (AP) conduction. During the tachycardia, atrial double potentials ...