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Electrophysiological Studies During Open Heart Surgery

Albert L. Waldo, MD; Thomas N. James, MD

Arch Intern Med. 1975;135(3):411-417.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

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 al¹ in 1953 accomplished this by using needle electrodes inserted through the epicardium. Similar recordings using needle electrodes were made in 1955 by Scher² and in 1957 by Durrer and Van Der Tweel.³ Stuckey, Hoffman and associates^4-10 then 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 . . . [Full Text PDF of this Article]

Author Affiliations
From the Department of Medicine, School of Medicine, University of Alabama in Birmingham.

Footnotes
Received for publication Nov 6, 1974; accepted Nov 11.

Reprint requests to 1919 Seventh Ave S, Birmingham, AL 35233 (Dr. Waldo).

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