Quantification of human atrioventricular nodal concealed conduction utilizing S1S2S3 stimulation.
نویسندگان
چکیده
منابع مشابه
Quantification of human atrioventricular nodal concealed conduction utilizing S1S2S3 stimulation.
We studied antegrade concealed conduction of atrial extrastimuli (A2) that blocked in the atrioventricular (AV) node in eight subjects, using a third extrastimulus (A3), coupled at decreasing coupling intervals to A2. Three A1-A2 intervals were tested in each subject: late (just shorter than AV nodal effective refractory period), intermediate, and early (just longer than atrial functional refra...
متن کاملConcealed and supernormal atrioventricular conduction.
THE FAILURE of a cardiac impulse to traverse the entire atrioventricular (AV) conducting system is called concealed conduction. Electrocardiographically, the effects of concealed conduction are reflected in the conduction and/or formation of subsequent beats.1 The concept of concealed conduction can be applied to explain (1) post-extrasystolic prolongation of the P-R interval, (2) the irregular...
متن کاملEvidence of concealed atrioventricular conduction in man.
THE TERM "concealed conduction" was introduced by Langendorfl to describe the phenomenon of entry of an electrical impulse into the A-V node without complete transmission but with modification of conduction of a subsequent impulse. This concept unified diverse observations of earlier years concerning disturbances of A-V transmission2-4 and clarified the mechanisms of many arrhythmias.5 6 Subseq...
متن کاملConcealed retrograde conduction in complete atrioventricular block.
INCOMPLETE TRANSMISSION of impulses across the atrioventricular (A-V) junction has held a special fascination for many investigators.'14 Varied investigational techniques including venous pulse waves, standard electrocardiograms, and direct catheter electrode recordings from the cardiac chambers have been used to further the understanding of retrograde transmission of impulses into the A-V junc...
متن کاملIonic mechanisms of electronic inhibition and concealed conduction in rabbit atrioventricular nodal myocytes.
BACKGROUND The term "concealed conduction" is used in electrocardiography when a proximal (atrial or ventricular) impulse penetrates the atrioventricular (AV) node but fails to traverse it completely. Its penetration into the node is inferred by its after effects on the propagation of succeeding impulses. Concealed AV nodal conduction is a well-established phenomenon, but its precise cellular a...
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ژورنال
عنوان ژورنال: Circulation Research
سال: 1976
ISSN: 0009-7330,1524-4571
DOI: 10.1161/01.res.39.5.659