Familial Polytopic and Polymorphic Extrasystoles

Extrasystoles and Allied Arralythmias

Sustained polymorphic ventricular tachycardia induced during radiofrequency catheter ablation of idiopathic right ventricular outflow tract extrasystoles

A 60-year-old male with a long-lasting history of palpitations was referred to our hospital for further evaluation. His family history was negative for sudden cardiac death at a young age. Transthoracic echocardiography and exercise treadmill test ruled out structural heart disease. Baseline ECG showed sinus rhythm and frequent premature ventricular contractions (PVCs) displaying rS pattern in ...

Mainstem extrasystoles.

Extrasystoles arising in the main stem of the bundle of His are generally regarded as very rare; only 7 examples have been published since their original description by Lewis in 1911 and 2 of these fail to satisfy rigid criteria for diagnosis. Four further examples, encountered in a relatively small series of tracings, are here presented and it is concluded that such extrasystoles are not so mu...

Retrograde conduction of ventricular extrasystoles with consideration of return extrasystoles.

Concealed ventricular extrasystoles.

AN apparently haphazard distribution of ventricular extrasystoles may not be so haphazard as it appears and indeed may mask an underlying regularity. We previously reported a case in which careful analysis uncovered a simple but remarkable phenomenon, namely, that the interectopic intervals always contained an odd number of sinus beats.1 This was explicable on the assumption that a bigeminal rh...