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Results for “Bundle-Branch Block”

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At least 667 records · Page 37Linked to original sources
PubMed1977

Abnormalities of cardiac conduction in sinus node disease. Correlation with clinical findings.

His bundle recordings, sinus recovery time and the response to atropine were studied in 28 patients with symptomatic sinus node disease. The electrophysiological data were correlated with the clinical picture and the course of the disease. The marked prolongation of sinus recovery time and a decidedly diminished responsiveness to atropine may increase the accuracy of clinical assessment of the disease but negative results of these tests do not exclude even serious dysfunction of the node. The His bundle electrogram provides a more thorough evaluation of AV conduction and should be taken into account when permanent electrotherapy is being considered.

Adolescent↗
PubMed1976

[Cardiovascular disorders in young military personnel. Treatment and readjustment].

The vascular disturbances most commonly encountered in conscripts are examined and the features leading to their diagnosis and the consequent differentiation of organic heart diseases are described. Rhythm variations, auscultation abnormalities (systolic, diastolic and vascular murmurs, additional tones) and ECG alterations thus detected are seen as instances of functional disorders, of a non-dangerous nature that will regress or disappear in the course of time.

Adult↗
PubMed1976

'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.

Adult↗
PubMed1978

Electrophysiological properties of intravenous metoprolol in man.

Electrophysiological changes produced by intravenous (0.1 mg/kg) metoprolol, a new selective beta 1-blocking agent devoid of intrinsic activity, were studied in 16 subjects with estimated normal impulse formation and conduction. The most important effects were sinus bradycardia, mild increase of sinoatrial conduction time, depression of intranodal conduction, and prolongation of AV node refractory periods. Sinus node recovery time and atrial refractory periods were unmodified. Infranodal conduction and the refractory periods of the His-Purkinje system, as well as of the bundle-branches, were unchanged. These effects are compared with those observed after intravenous propranolol, pindolol, and oxprenolol.

Adult↗
PubMed1978

Mahaim conduction producing left axis deviation and normal QRS.

An unusual patient is described in whom electrophysiological studies strongly suggest the occurrence of Mahaim conduction. The patient whose electrocardiogram previously showed a left anterior hemiblock pattern then developed advanced atrioventricular (AV) block (AH block). Beats conducted through the atrioventricular node always had a short HV interval (20 ms) and QRS complexes of left anterior hemiblock pattern. Junctional escape beats always had a normal HV interval (50 ms) with normal intraventricular conduction. His bundle pacing showed the StV interval and QRS contour of escape beats. These findings suggest the existence of an accessory pathway (Mahaim fibres) passing from the area of block, presumably the uppermost portion of the His bundle, to the posteroinferior division of the left bundle-branch. The surface electrocardiogram did not show the characteristic delta wave of the Wolff-Parkinson-White syndrome. Our observations suggest that patients in whom there is conduction along Mahaim fibres may show only the pattern of intraventricular conduction defect without a delta wave.

Cardiac Complexes, Premature↗