Patient aged 42, Caucasian, asymptomatic, with family history of HCM and diagnosis of the same cardiomyopathy 22 years ago. The 24-h Holter heart rhythm monitoring (April 5, 2012) showed sinus rhythm, rare atrial ectopic beats, presence of 2,970 isolated ventricular extrasystoles and five outbreaks of non-sustained ventricular tachycardia (NSVT), the longest one presenting 13 QRS complexes. Giv...

1. Site of origin. They are either ventricular or supraventricular. Supraventricular ectopics may be subclassified into either: (a) atrial (originating in the atria) or (b) junctional or nodal (originating in the AV node or bundle of His). 2. Timing. Ectopic complexes that occur before the next normal complex would have been due are termed premature, and those that occur following a pause such ...

Recent reports have indicated that tachycardia as well as bradyeardia may be arrhythmogenic in acute myocardial infarction. The present experimental study was designed to systematically evaluate the arrhythmogenic and antiarrhythmic effect of heart rate over a wide spectrum using sinus node crush and atrial pacing. Serial recordings of the surface electrocardiograms and local electrograms for a...

Background. Information about electrophysiological characteristics and radiofrequency ablation of intra-atrial reentrant tachycardia has not been reported before. We proposed that induction and termination of intra-atrial reentrant tachycardia by atrial extrastimuli or rapid atrial pacing and resetting the response pattern by atrial extrastimuli during intra-atrial reentrant tachycardia could e...

BACKGROUND Information about electrophysiological characteristics and radiofrequency ablation of intra-atrial reentrant tachycardia has not been reported before. We proposed that induction and termination of intra-atrial reentrant tachycardia by atrial extrastimuli or rapid atrial pacing and resetting the response pattern by atrial extrastimuli during intra-atrial reentrant tachycardia could en...

OBJECTIVE The purpose of this study was to determine if the atrial response upon cessation of ventricular pacing associated with 1:1 ventriculoatrial conduction during paroxysmal supraventricular tachycardia is a useful diagnostic maneuver in the electrophysiology laboratory. BACKGROUND Despite various maneuvers, it can be difficult to differentiate atrial tachycardia from other forms of paro...

BACKGROUND Cardiac arrhythmias as a late complication following congenital heart surgery are encountered more and more frequently in clinical practice. The use of new electrophysiological methods of visualisation and mapping improves the efficacy of radio-frequency (RF) ablation of these arrhythmias. AIM To assess patterns of atrial arrhythmias following congenital heart surgery and to examin...

Two neonates with rapid and irregular pulse rate had an uncommon form of atrial tachycardia. The irregular heart rate was first detected during fetal monitoring. Postnatal electrocardiograms were compatible with the diagnosis of multifocal atrial tachycardia or chaotic atrial rhythm. Both patients were treated with digoxin and the rhythm gradually reverted to sinus. This may represent the first...