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Peter S. Rahko, MD; Edward I. Curtiss, MD, FACC

Arch Intern Med. 1983;143(9):1750-1752.

	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 diagnosis of Mobitz II (second-degree, atrioventricular [AV]) heart block implies a primary disorder of conduction localized to the His-Purkinje system and the potential for sudden progression to complete heart block.¹ However, an ectopic focus located in the His bundle or a bundle branch may, with proper timing, partially penetrate the conduction system and collide with normal sinus impulses, causing either slowing or complete blockage of the sinus impulse. This phenomenon, a manifestation of concealed conduction, may mimic first- or second-degree AV block, including a Mobitz II pattern, resulting in what has been termed pseudoatrioventricular block.² Pseudoatrioventricular and true AV blocks have different therapeutic and prognostic implications. Therefore, identification of pseudoatrioventricular block is clinically important.

REPORT OF A CASE

A 29-year-old woman was admitted to the hospital for elective repair of an ostium primum atrial septal defect. Her admission ECG disclosed normal sinus rhythm, a left-axis deviation, and . . . [Full Text PDF of this Article]

Author Affiliations

Footnotes

Reprint requests to the Central Heart Station, Presbyterian-University Hospital, Pittsburgh, PA 15213 (Dr Curtiss).

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