[Vectorcardiography in XXXX associated with left bundle-branch block].

@entity1 @entity1188
The authors report a series of 13 @entity1 , 8 @entity1 and 5 @entity1 , with an average age of 68 years (range 39 to 87 years) presenting with documented @entity1188 with anteroseptal extension in 2 cases. These @entity1 developed LBBB (complete in 9 cases, incomplete in 4 cases). This complications occurred in the acute phase in 8 cases and 4 months to 9 years later (average 4,5 years) in the other 5 cases. The block was intermittent in 4 @entity1 and became permanent in all cases. The diagnosis of @entity1188 with LBBB was made by vectorcardiography (VCG) in 5 out of the 13 @entity1 (38,4 p. 100) on the criteria suggested by Starr. 3 of the 8 false negative results were directly related to the block which masked the ECG and VCG signs of @entity1188 . The VCG signs observed were an upwards displacement of the QRS loop with preservation of the superior orientation of the initial forces (5 cases). Atypical appearances of LBBB were observed in 2 cases with a posterior and right-sided shift of the efferent loop following the anterior and left-sided orientations of the initial forces. The sensitivity of the VCG and ECG is mediocre in @entity1188 with LBBB because the block may mask the electrical signs of @entity1188 . The specificity of the VCG could not be assessed because of the mode of selection of the @entity1 and the small number of cases.
