[Diagnostic difficulties of isolated left posterior hemiblock(author's transl)].

Out of 4000 vectorcardiograms, 23 of them showed the most tipical pattern of left posterior hemiblock (BFP). According to the vectorial characteristics, they were divided into 5 groups; only two groups (for a total of 8 cases) showed, according to the Authors' opinion, the characteristics of the isolated BFP. The diagnostic difficulties of such a conduction disturbance are discussed since, it simulates, the vectorial pattern of the vertical heart. Moroever there is an underlining possibility that conduction disturbances in the right heart coexist in many cases of supposed isolated BFP with marked axis rotation to the right. The Authors agree with the hypothesis already expressed by Polu on the vectorial progress of the isolated BFP which should have an AQRS of about 70 degrees; an exact electrocardiographic diagnosis might be therefore impossible.