Shifts in the site of initial activation within or away from the SA node to other ectopic sites can lead to major changes in the pattern of atrial activation and, hence, in the morphology of P waves. These shifts can occur either as escape rhythms if the normal SA nodal pacemaker fails or as accelerated ectopic rhythms if the automaticity of an ectopic site is enhanced Chap. 35 . The resulting ...

Abstract Recognizing ECG cardiac arrhythmia automatically is an essential task for diagnosing the abnormalities of muscle. The proposal few algorithms has been made classifying arrhythmias, however system classification efficiency determined on basis its prediction and diagnosis accuracy. Hence, in this study efficient as expertise. Discrete Wavelet Transform (DWT) being utilized preprocessing ...

This essay is designed to review some of the basic and more recent contributions to our understanding of supraventricular tachyarrhythmias, their mechanisms, pertinent points in diagnosis, and treatment. Supraventricular tachycardia is discussed under the concept of reentrant mechanisms versus accelerated ectopic pacemakers. Atrial fibrillation and flutter, multifocal atrial tachycardia, suprav...

To date, there have been fewer than 50 cases of atrial flutter with 1:1 A-V conduction documented in the English literature.1 The purpose of this paper is to emphasize the diagnostic facets of this relatively uncommon rapid ectopic rhythm and to review the pharmacology of the various therapeutic agents used in its treatment. Two additional cases of 1:1 atrial flutter are reported, one occurring...

Radiofrequency catheter ablation (RFCA) was performed on a 5-year-old boy with congenital junctional ectopic tachycardia (JET) that was refractory to medical management. Because of the lack of retrograde atrial depolarization during tachycardia, radiofrequency energy was delivered during atrial overdrive pacing to confirm the presence of preserved atrioventricular (AV) conduction. Although the ...

A bout 15 years ago, Waldo and associates' first described that a tachycardia could be transiently accelerated to a faster rate by overdrive pacing without fundamentally altering the underlying tachycardia, a phenomenon they called transient entrainment. That first description of transient entrainment applied to atrial flutter but was soon extended to ectopic atrial tachycardias,2 atrioventricu...

We describe the criteria for differential diagnosis between 3:2 sinoatrial block from atrial bigeminy due to an ectopic focus in the sinus or parasinus zone. In the 3:2 sinoatrial block the RR interval of the basic rhythm is similar to the short R-R interval of the paired rhythm. In atrial bigeminy, the R-R interval of the basic rhythm is similar to the long R-R interval of the paired rhythm.

Antazoline was administered in sixty-five episodes of various types of cardiac arrhythmia. A complete suppression of the ectopic beats was achieved in five out of six episodes of premature atrial systoles and in twenty-one of the twenty-four episodes of ventricular premature systoles. Conversion to sinus rhythm was observed in seven out of ten and four out of five episodes of paroxysmal atrial ...