Pseudo A-V block associated with A-H and H-V conduction defects |
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Authors: | G S Eugster C C Godfrey H L Brammell R Pryor |
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Affiliation: | Department of Medicine, Division of Cardiology, University of Colorado Medical Center, Denver, Colo, USA. |
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Abstract: | His bundle electrograms were recorded in a patient with tertiary syphilis whose ECG's showed right bundle branch block, junctional premature systoles, and episodes suggesting both Mobitz Type I and II second degree A-V block. Junctional premature depolarizations were found to cause: (1) ventricular systole, (2) retrograde atrial depolarizations with atrial fusion, and (3) nonconducted P waves of normal contour (pseudo A-V block). Nonconducted nonpremature P waves were also noted to occur secondary to both A-H and H-V forms of second degree A-V block in the absence of junctional premature activity.The presence of an H-V conduction defect may cause antegrade block of junctional premature depolarizations and enhance their expression as pseudo A-V block. This term should, therefore, not be meant to imply A-H and H-V conduction. |
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Keywords: | Reprint requests to: Dr. Ray Pryor Division of Cardiology University of Colorado Medical Center 4200 East Ninth Ave. Denver Colo. 80220. |
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