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[Lesions of the right branch of the bundle of His. Clinical, electrocardiographic and histologic study of 33 cases].
The topography and severity of lesions of the right branch of the bundle of His have been studied as a function of the electrocardiographie changes and the associated heart disorder in 33 cases with more than 50% of the fibres destroyed. It appears that lesions of the right branch of the bundle of His, while severe and diffuse in cases of chronic complete right branch block, were severe but localised in 5 of the 6 cases with a stable incomplete right block. Total, subtotal or partial destruction of the right branch of the bundle of His was associated with lesions of the A-V node and/or the main truck of the bundle of His in the five cases with a complete atrio-ventricular block. The lesions of the right bundle branch involved the superior, middle and inferior portions in the case of aortic valve lesions, the middle portion in mitral valve disease, and the inferior portion in those with myocardial infarction. Ventricular hypertrophy seems to play an important in deciding whether the axis of the QRS, complex is left or right.
[Disorders of intracardiac conduction in anesthesia-resuscitation].
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[Left bundle of His branch block in stages 3 and 4 with conduction in the right branch only in a super-normal period].
The authors report a case of chronic second degree atrio-ventricular block with permanent right bundle branch block. Intracavitary electrophysiological recordings allowed them to delimit the refractory period of the left branch, which was affected by a block during phase 3 but also during phase 4. They showed that there was possible conduction by the right branch during the extremely fine time limits of a supernormal period; using an atrial stimulation rate of 150/mn, it is therefore possible to obtain 1/1 conduction in the presence of a left bundle branch block.
[Various problems in intermittent intraventricular conduction].
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Procainamide-induced lupus syndrome in siblings.
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Two wrongs sometimes make a right!
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[Arrhythmias in inflammatory heart disease (author's transl)].
A review and discussion of the incidence and clinical importance of various cardiac arrhythmias in patients with inflammatory diseases of the heart is presented in this paper.
[Adverse effects of drugs: syncope due to prenylamine (author's transl)].
The authors report on 4 Intensive Care Unit cases, hospitalized for syncopes due to serious ventricular arrhythmias. They all presented long Q-T and were receiving treatment with prenylamine. Improvements were observed on suspension of the drug, suggesting therefore that during this treatment, frequent electrocardiographic checks, especially for elderly patients, should be carried out. Caution should also be exercised in associations with other chinidinosimiles and hypokaliemic drugs
Asynchronous conduction in the human His bundle.
2 patients with symptoms of paroxysmal AV block showed widening, splitting, slurring and decreasing amplitude of the His potential. Concomitantly, this was followed by different patterns of bundle branch block. In one of the patients it was obvious that a left bundle branch block was related to a Wenckebach phenomenon in the His bundle, and in the other patient different bundle branch block patterns were related to the occurrence of the intra-His bundle conduction delay. It is suggested that the present electrophysiological findings reflect asynchronous conduction in the His bundle causing a critical conduction delay in parts of the bundle branches leading to bundle branch block.
[Progress in the differential diagnosis of bradycardial arrhythmias].
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Partial heart-block: Can His-bundle electrography predict progression?
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[State of the heart conduction system in the sick sinus syndrome (according to the recording of the bundle of His potentials and the atrial stimulation test)].
It was established that the presence of Samoilov-Wenckebach's periods and prolongation of the H--V interval at low frequency of the imposed rhythm as well as periods of asystolia of more than 1,200 msec are most typical for these patients. An attempt was made to determine the type of cardiac stimulation indicated for such patients from the character of the disorders of rhythm observed in them and the initial frequency of their own cardiac contractions.
[Treatment of severe ventricular arrhythmia by means of repeated cardiac stimulation].
The overdrive pacing method is widely used now in clinical practice for prevention and treatment of severe ventricular disorders of the cardiac rhythm. The mechanisms of arrhythmia suppression by means of this stimulation is analysed. Indications are determined for the choice of the site of stimulation and optimal impulce frequency in ischemic heart disease, and overdosage with digitalis drugs, as well as in myocardiopathy.
[Electrophysiological peculiarities of the heart. The phenomenon of intermittently fluctuating bundle-branch blockade in extrasystoles].
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[Arrhythmias in direct fetal electrocardiography].
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'Supernormal' phase in hemiblock conduction.
A case is described where the basic sinus rhythms is associated with an advanced degree of left anterior hemiblock. The rhythm is complicated by atrial extrasystoles, associated with a lesser degree of left anterior hemiblock. This paradox of 'supernormality' is explained on a critical interplay of differential refractoriness within the divisions of the left bundle-branch.