If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present. If the QRS complex is widened and upwardly deflected in lead V1, a right bundle branch ...
A left anterior fascicular block (LAFB ... Usually a rS complex in lead II and aVF as well (not always). A LAFB can occur simultaneously with a right bundle branch block. This is referred to ...
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