Figure 94-35f

Premature atrial beats showing increasing degrees of (incomplete and complete ) LPFB aberration. The first beats in all panels are escape beats with the same morphology as that of the sinus beats. The second, aberrantly induced ventricular complexes show different degrees of right axis shift with an increase in size of the R waves in leads 11 and 111. Note that the fundamental characteristic of LPFB was not right axis deviation (beyond + 90degrees), but an inferioraxis shift.

(A. Castellanos , RJ Myerburg: The Hemiblocks in Myocardial Infarction.NY,Appleton-Century-Crofts.1976.)

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