Key result
Electrograms can be recorded from the atrioventricular conduction system of the heart in situ by local application of electrodes to the endocardial surface.
Historical review of the early techniques used to record electrograms directly from the atrioventricular conduction system.
Demonstrates feasibility of direct AV electrogram recording; leaves open translation to modern arrhythmia management.
The recording of electrograms directly from the surface of the heart in situ has been a part of many standard experimental procedures for decades. However, it is only recently that electrograms have been recorded specifically from the atrioventricular conduction system of the heart in situ. Burchell et al¹in 1953 accomplished this by using needle electrodes inserted through the epicardium. Similar recordings using needle electrodes were made in 1955 by Scher²and in 1957 by Durrer and Van Der Tweel.³Stuckey, Hoffman and associates⁴⁻¹⁰then demonstrated that electrograms could be recorded from the atrioventricular conduction system of the heart in situ by local application of electrodes to the endocardial surface. Electrograms recorded from the His bundle and bundle branches were identified by their appearance during the isoelectric portion of the PR interval of a simultaneously recorded ECG lead⁸(Fig 1). To obtain endocardial electrograms, they
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Albert L. Waldo (1975) conducted a review in Cardiac conduction system electrograms. Recording of electrograms from the atrioventricular conduction system was evaluated. Electrograms can be recorded from the atrioventricular conduction system of the heart in situ by local application of electrodes to the endocardial surface.
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