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Results for “Bundle-Branch Block”

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At least 109 records · Page 6Linked to original sources
PubMed1976

[Accuracy and variability of medical interpretation of the electrocardiogram].

The accuracy of medical interpretation of the ECG, the variability of electrocardiographic conclusions drawn by different physicians and by a specialist when re-analyzing the same ECG were considered. Three experienced physicians analyzed 700 ECG independently from one another. The electrocardiographic inferences were contrasted against the autopsy, roentgenographic and clinical findings. A paired comparison of electrocardiographic conclusions made by the physicians with respect to the principal groups of these conclusions was undertaken. The mean frequency of complete concurrence of the conclusions varied from 26 to 89 per cent, depending upon the type of the electrocardiographic conclusion. Subject to comparison were also conclusions drawn by a single physician with a two-fold analysis of the same ECG. In this case the frequency of divergent inferences amounted to 43 per cent.

Bundle-Branch Block↗
PubMed1976

[Influence of left anterior hemiblock on electrocardiographic indices of left ventricular hypertrophy (author's transl)].

The influence of left anterior hemiblock (LAH) on some electrocardiographic criteria of left ventricular hypertrophy (LVH) was investigated. 131 subjects were studied: 34 of them were normal (control group); 30 were carriers of isolated LAH; 38 were carriers of isolated LVH; 29 showed a pattern of combined LVH and LAH. The maximal voltages of QRS waves in leads usually analyzed for LVH, the QRS duration and the time of onset of the intrinsicoid deflection were compared among the groups. The specificity, the sensitivity and the performance of some LVH criteria were examined as well. LAH has been shown to conceal LVH on precordial leads, while it tends to make LVH more manifest on limb leads. The Romhilt and Estes' point score system proved to be the least affected by LAH. On the grounds of theoretical considerations and of empirical trials, we suggest modifying the Romhilt and Estes' point score system; furthermore we suggest modifying Sokolow's and Grant's criteria only when LAH is present. Such modified criteria have improved the accuracy of LVH prevision.

Adult↗
PubMed1976

Propagated responses produced by pacemaker stimuli falling within the QRS complex.

In a patient with idiopathic hypertrophic subaortic stenosis, propagated responses followed testing stimuli (St2) delivered within the wide QRS complexes elicited by driving stimuli (St1). This phenomenon was not seen at all St1-St2 which produced the minimal V1-V2 interval. It appeared at St1-St2 intervals which resulted in the largest difference between St1-St2 intervals, probably because of the marked asymmetry of propagation occurring very early in the cycle. More studies are required to determine whether this was due to a shift of the vulnerable period toward early systole (suigenesis to idiopathic hypertrophic subaortic stenosis) or to more complex types of intraventricular reentry. In other clinical conditions a similar mechanism could explain the multiple responses produced by pacemaker stimuli falling at the end of ventricular depolarization and also by "properly synchronized' low intensity transthoracic electrical discharges.

Adult↗
PubMed1977

EKG of the month.

Explore the source record for details and available documents.

Atrial Fibrillation↗
PubMed1976

[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

Aged↗
PubMed1978

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.

Aged↗
PubMed1979

[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.

Action Potentials↗
PubMed1979

[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.

Adult↗