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At least 19 recordsLinked to original sources
PubMed1975

[Paroxysmal tachycardia due to a latent Wolff-Parkinson-White syndrome].

The authors studied 35 cases of Bouveret type paroxysmal tachycardia with normal baseline ECB, without any signs of Wolff-Parkinson-White syndrome. In more than half the patients, it seems that it may be stated that the paroxysmal tachycardia is related not to a reciprocal intranodal rhythm, as is said classically, but to a reciprocal rhythm using in the anterograde direction the normal pathways and in a retrograde direction a direct atrio-ventricular bundle in which only retrograde conduction is possible. This explains the absence of any patent preexcitation pattern on tracings in sinus rhythm. The authors particularly stress the value of a sign recorded at the onset of an attack of tachycardia: transient slowing of the rate of the tachycardia when functional bundle branch block is present can only be explained by the existence of a latent preexcitation bundle on the side of the "slowing bundle branch block".

Bundle-Branch Block↗
PubMed1975

Effects of disopyramide on electrophysiological properties of specialized conduction system in man and on accessory atrioventricular pathway in Wolff-Parkinson-White syndrome.

Seven patients with normal specialized conduction system and three patients with the Wolff-Parkinson-White (WPW) syndrome were studied using programmed stimulation of the heart before and after the administration of intravenous disopyramide. The principal effect of this drug was to prolong the effective refractory period of the atria and ventricles, and to prolong the effective refractory period of the anomalous pathway in the WPW syndrome. In addition, it prolonged the conduction time in the anomalous pathway in the WPW syndrome. These findings suggest that disopyramide would be a useful and safe drug in the management of certain atrial and ventricular arrhythmias and in the management of the Wolff-Parkinson-White syndrome with atrial fibrillation.

Adolescent↗
PubMed1976

'Incessant' tachycardias in Wolff-Parkinson-White syndrome. I: Initiation without antecedent extrasystoles or PR lengthening, with reference to reciprocation after shortening of cycle length.

In 6 patients with the Wolff-Parkinson-White (WPW) syndrome, repetitive, almost continuous (incessant) reciprocating atrioventricular (AV) tachycardia has been shown to arise when the sinus cycle length was shortened to a critical point, at which unidirectional block occurred without the classical feature of PR prolongation. Though this phenomenon superficially resembles an aspect of chronic intranodal reciprocating tachycardia of children, basic differences can be identified. It was encountered more frequently in younger subjects; the only patient over 45 developed the arrhythmia as a complication of therapy. This incessant mechanism may explain some cases in which antiarrhythmic treatment does not control reciprocating tachycardia in the WPW syndrome, but such a mechanism can also occur spontaneously.

Adolescent↗
PubMed1976

[Effects of verapamil on sinusal function and on atrioventricular conduction along normal and abnormal pathways, in patients with pre-existing troubles of excitation conduction (author's transl)].

Effects of verapamil (5 mg i.v.) on excitation conduction in 20 patients who already had a basic alteration (7 with ventricular pre-excitation syndrome) were studied by His electrogram, during spontaneous sinusal rhythm and atrial electrostimulation in increasing frequencies. In 4 cases, a test crossed with atropine was carried out. The effects of the drug on the effective refractory period of the A-V node and the anomalous tract in 3 patients with W.P.W. syndrome of Kent's bundle were studied. The effects were: no significant modifications in the sinusal frequency; increase in the corrected preautomatic pause only in cases with sick sinus node syndrome and serious basic compromise of the sinus node function; slowing down of A-V conduction in the supra-hisian area and increase of the effective refractory period of the A-V node; no modification of the intra-atrial conduction, or the under-hisian and intraventricular A-V conduction; uneven slowing down of conduction along the anomalous tract of the pre-excitation syndrome of the James bundle; modification of the effective refractory period of the anomalous tract of the Kent bundle type, variable from case to case. On the basis of the electrophysiological properties, the possibilities and limits of use of the drug in sick sinud node syndrome in the common supraventricular paroxymal tachycardias, in atrial fibrillation, atrial flutter and arrhythmias of the ventricular pre-excitation syndrome are emphasized.

Adult↗
PubMed1976

His bundle recordings in diagnosis of impulse formation in Kent and Mahaim tracts.

His bundle electrograms were recorded in 2 patients with ectopic beats arising in accessory atrioventricular tracts. Case 1 had Wolff-Parkinson-White (WPW) type A and a left-sided Kent tract with a short effective refractory period. Though ectopic impulse formation most probably occurred within the Kent tract itself, a vulnerability-related origin in the ventricular muscle close to the distal end of the Kent tract could not be excluded. In Case 2, with a Mahaim tract extending from His bundle to ventricles, there were three types of QRS morphologies resulting from : (a) atrioventricular conduction exclusively through the normal pathways; (b) atrioventricular conduction through both, normal pathway, and Mahaim tract; and (c) ectopic impulse formation in the Mahim tract. Specialized electrophysiological studies were essential to diagnose these unusual arrhythmias.

Adult↗