Abstract
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.<sup>1</sup>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<i>pseudoatrioventricular block</i>.<sup>2</sup>Pseudoatrioventricular and true AV blocks have different therapeutic and prognostic implications. Therefore, identification of pseudoatrioventricular block is clinically important. <h3>REPORT OF A CASE</h3> 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
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
