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Both of the hemiblocks—left anterior and left posterior—are defined only in terms of axis. Thus, the reader learns that left anterior hemiblock is probably present if the axis is between minus 30 and minus 60 but almost certainly present if between minus 60 and minus 90. Similarly, "classic" left posterior hemiblock means an axis of plus 120 degrees or more. Nowhere is there a reference (in the 71 included) to Medrano's additional criteria of delayed activation of the cardiac muscle supplied by a given fascicle. The emphasis on the left anterosuperior and posteroinferior divisions is amply justified. Although the illustrations
The Hemiblocks in Myocardial Infarction.. Ann Intern Med. ;85:551. doi: 10.7326/0003-4819-85-4-551_2
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Published: Ann Intern Med. 1976;85(4):551.
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