Case Of Ventricular Parasystole Research Articles

Ablation of unmappable ventricular parasystole originating from the right ventricular outflow tract: a case report

BackgroundWhen the coupling interval is matched, ventricular parasystole can form a stable fusion QRS complex with sinus rhythm. Ablation of a fusion QRS complex has been rarely reported and is unexpectedly difficult.Case presentationWe describe a case of ventricular parasystole from muscle sleeves of the right ventricular outflow tract. The patient was a 54-year-old woman who was admitted to the hospital because of frequent palpitations for 3 months. Anti-arrhythmic drugs had been ineffective, and she had no history of cardiovascular disease. Because the fusion QRS complex interfered with the conventional mapping technique, we could not eliminate the ventricular parasystole successfully.Results and conclusionsFinally, we used the reversed U curve method and found that the source of ventricular arrhythmia was in the right cusp according to the special local potential. A fusion QRS complex formed by ventricular parasystole and nodal ventricular activation make mapping and ablation difficult. The special local potential was the only evidence available to confirm the target of ablation satisfactorily.

Ventricular Parasystole with the Wolff-Parkinson-White Syndrome

Ectopic ventricular rhythms, particularly ventricular extrasystoles, have been thought to be more commonly associated with the Wolff-Parkinson-White syndrome than with individuals exhibiting uncomplicated intraventricular conduction. 1 Scherf D Cohen J The Atrioventricular Node and Selected Cardiac Arrhythmias. Grune and Stratton, New York1964 Google Scholar This has yet to be established. Only one case of ventricular parasystole in association with the Wolff-Parkinson-White syndrome has, to the best of our knowledge, been reported. 2 Pick A Katz LN Disturbances of impulse formation and conduction in the pre-excitation (W.P.W.) syndrome: Their bearing on its mechanism. Am J Med. 1955; 19: 759 Abstract Full Text PDF PubMed Scopus (22) Google Scholar The following is another example of this manifestation.

Ventricular parasystole in a newborn infant

A case of ventricular parasystole is presented which appeared in an otherwise healthy newborn infant. The dysrhythmia persisted until 10 months of age. In contrast to its occurrence in adults, this rare dysrhythmia appears not to be associated with primary cardiac disease in children.

Mechanisms of ventricular parasystole.

Eight cases of ventricular parasystole are reported. In all these cases, regardless of whether parasystole seems intermittent or "continuous," the presence of second degree entrance block of the Mobitz type I was suggested. Parasystole alternated with concealed extrasystolic bigeminy showing occasional reentrant extrasystoles. Such intermittent parasystole appears to originate in the reentrant path of extrasystoles. Reentrant extrasystolic bigeminy was seen in a comparatively rapid sinus rhythm, whereas parasystolic bigeminy was seen in a comparatively slow sinus rhythm. The difference between the interectopic intervals during parasystolic bigeminy and during (manifest or concealed) extrasystolic bigeminy was comparatively small so that occasionally the difference was not distinct; on such an occasion the case showed a seemingly "continuous" parasystole. These observations strongly suggest the possibility that most cases of parasystole, whether intermittent or "continuous," may be governed by incomplete entrance block of the second degree.

Ventricular Parasystole with Reentry in the AV Node

A case of ventricular parasystole with concealed retrograde conduction is presented. Two instances of ventricular reexcitation in the form of echo beats are described. The absence of retrograde atrial activity preceding the echoes suggests that the reentry circuit did not include an atrial bridge. A review of the pertinent literature discusses the role of the atria in the reentry path of ventricular echoes.

A Case of Ventricular Parasystole : Especially with reference to the relations to ordinary extrasystole

A Case of Ventricular Parasystole : Especially with reference to the relations to ordinary extrasystole