Three patients with recurring attacks of supraventricular tachycardia and no electrocardiographic evidence of the Wolff-Parkinson-White syndrome (WPW syndrome) were studied using intracardiac recordings and atrial stimulation. The findings are interpreted as evidence of a concealed WPW syndrome. In all patients there was antegrade block of the anomalous atrioventricular (A-V) pathway while retrograde conduction was unimpaired and allowed the initiation of the observed reciprocating tachycardias. The diagnosis was based on the assumption that the ventricular myocardium was an essential link in the re-entry circuit. The three most important findings to support this assumption are: 1) retrograde conduction time, measured by the Q-A' interval (Q in ECG to atrial echo), and the rate of tachycardia were dependent on the mode of intraventricular conduction: 2) the first Q-A' interval of the tachycardia was independent of the A-H interval (initiation of atrial impulse to first activation of the His bundle) of the initiating premature atrial depolarization (PAD); 3) there was retrograde conduction following a ventricular premature beat during tachycardia at a time when the A-V node and/or the bundle of His would be refractory.
Effect on paroxysmal re-entrant supraventricular tachycardia of a drug affecting calcium transport (Ro 11-1781)
Clinical, electrocardiographic and electrophysiologic observations in patients with paroxysmal supraventricular tachycardia
Use of double ventricular extrastimulation to determine the preexcitation index in atrioventricular nodal reentrant tachycardia
Atrioventricular reciprocal rhythm and chronic reciprocating tachycardia in a newborn infant with concealed Wolff-Parkinson-White syndrome
Re-entrant tachycardia using two bypass tracts and excluding AV node in short PR interval, normal QRS syndrome
Non-invasive three-dimensional localisation of arrhythmogenic foci in Wolff-Parkinson-White syndrome and in ventricular tachycardia by radionuclide ventriculography: phase analysis of double-angulated integrated single photon emission computed tomography (SPECT)
20p12.3 microdeletion predisposes to Wolff-Parkinson-White syndrome with variable neurocognitive deficits
Non-invasive diagnosis of concealed Wolff-Parkinson-White syndrome by detection of concealed anterograde pre-excitation
Use of only a regular diagnostic His-bundle catheter for both fast and reproducible "para-Hisian pacing" and stable right ventricular pacing
Spontaneous incessant AV reentrant tachycardia related to left bundle branch block and concealed left-sided accessory AV pathway
Complete atrioventricular block with intact retrograde conduction due to a concealed extranodal anomalous pathway
Conversion of paroxysmal supraventricular tachycardia due to a concealed extranodal pathway with intravenous bolus of lidocaine
Resetting criteria during ventricular overdrive pacing successfully differentiate orthodromic reentrant tachycardia from atrioventricular nodal reentrant tachycardia despite interobserver disagreement concerning QRS fusion
Paroxysmal supraventricular tachycardia utilizing concealed bypass tract induced by ventricular pacemaker
Usefulness of the delta HA interval to accurately distinguish atrioventricular nodal reentry from orthodromic septal bypass tract tachycardias
Concealed retrograde bypass tracts and enhanced atrioventricular nodal conduction. An unusual subset of patients with refractory paroxysmal supraventricular tachycardia
Use of intracardiac recordings to determine the site of drug action in paroxysmal supraventricular tachycardia
Post-myocardial infarction incessant supraventricular tachycardia due to concealed accessory pathway
Electrophysiologic characteristics of concealed bypass tracts: clinical and electrocardiographic correlates
Electrophysiologic effects and mechanisms of termination of supraventricular tachycardia by intravenous amiodarone
Recurrent paroxysmal supraventricular tachycardia: a complication of ventricular pacing in a patient with occult Wolff-Parkinson-White syndrome
Carotid sinus massage induced elimination of rate related bundle branch block during paroxysmal atrial tachycardia: a simple method of proving bypass tract participation in the tachycardia
Right atrial versus left atrial echo zones: a proposed new criterion for determining the atrial site of retrograde preexcitation
Localization of the accessory pathway in the Wolff-Parkinson-White syndrome from the ventriculo-atrial conduction time of right ventricular apical extrasystoles
Determinants of tachycardia induction using ventricular stimulation in dual pathway atrioventricular nodal reentrant tachycardia
Mechanisms of atrioventricular junctional tachycardia. Role of reentry and concealed accessory bypass tracts
Spectrum of regular tachycardias with wide QRS complexes in patients with accessory atrioventricular pathways
Antegrade and retrograde conduction characteristics in three patterns of paroxysmal atrioventricular junctional reentrant tachycardia
Role of extrastimulus site and tachycardia cycle length in inducibility of atrial preexcitation by premature ventricular stimulation during reciprocating tachycardia
Supraventricular tachycardia dependent upon accessory pathways in the absence of ventricular preexcitation
Clinical and electrophysiologic observations in patients with concealed accessory atrioventricular bypass tracts
Electrophysiologic effects of ouabain in patients with preexcitation and circus movement tachycardia
Effects of propranolol on anomalous pathway refractoriness and circus movement tachycardias in patients with preexcitation
The localization of bypass tracts in the Wolff-Parkinson-White syndrome from the surface electrocardiogram
Serial electrophysiologic studies of the effects of oral diltiazem on paroxysmal supraventricular tachycardia
Intractable paroxysmal tachycardia caused by a concealed retrogradely conducting Kent bundle. Demonstration by epicardial mapping and cure of tachycardias by surgical interruption of the His bundle
Bipolar catheter electrograms for study of retrograde atrial activation pattern in patients without pre-excitation syndromes
Catheter mapping of retrograde atrial activation. Observations during ventricular pacing and AV nodal re-entrant paroxysmal tachycardia
Ventriculo-atrial conduction time during reciprocating tachycardia with intermittent bundle-branch block in Wolff-Parkinson-White syndrome
The development of permanent unidirectional anterograde block in the accessory pathway of a patient with Wolff-Parkinson-White syndrome and observations on the mechanism of the ensuing incessant circus tachycardia
Discover the latest cardiology research in this collection of the top cardiology journals.
Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. Here is the latest research.
Arrhythmias are abnormalities in heart rhythms, which can be either too fast or too slow. They can result from abnormalities of the initiation of an impulse or impulse conduction or a combination of both. Here is the latest research on arrhythmias.
Cardiac Conduction System
The cardiac conduction system is a specialized tract of myocardial cells responsible for maintaining normal cardiac rhythm. Discover the latest research on the cardiac conduction system here.
Atrial fibrillation refers to the abnormal heart rhythm characterized by rapid and irregular beating of the atria. Here is the latest research.