Left Anterior Hemiblock Obscuring the Diagnosis of Right Bundle Branch Block | Zendy

Mauricio B. Rosenbaum | Zendy; JACOBO YESURÓN | Zendy; Julio O. Lázzari | Zendy; Marcelo V. Elizari | Zendy

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Left Anterior Hemiblock Obscuring the Diagnosis of Right Bundle Branch Block

Author(s) -

Mauricio B. Rosenbaum,

JACOBO YESURÓN,

Julio O. Lázzari,

Marcelo V. Elizari

Publication year - 1973

Publication title -

circulation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.795

H-Index - 607

eISSN - 1524-4539

pISSN - 0009-7322

DOI - 10.1161/01.cir.48.2.298

Subject(s) - medicine , right bundle branch block , qrs complex , cardiology , pr interval , electrocardiography , heart rate , blood pressure

Three cases in which left anterior hemiblock (LAH) obscured the diagnosis of right bundle branch block (RBBB) are reported. The RBBB was incomplete in one case and complete or of high degree in the other two. The LAH was intermittent in two cases. In the three cases, the LAH abolished not only the S waves in leads I and aVL, but also the terminal R wave in Vl. The possibility that RBBB, complete or incomplete, can be totally missed in the presence of LAH may imply a significant clinical danger, because some of the well known diagnostic and prognostic connotations of this association of conduction disturbances may then be overlooked. However, if the QRS interval is excessively wide or more than expected for pure LAH, the concealed or hidden RBBB can be suspected. It can be readily uncovered if additional unipolar high and right sided chest leads are recorded. The vectorcardiogram can also be helpful, if the possibility of concealed RBBB is kept in mind.

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