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 ...
VT is frequently either in a right bundle branch block pattern (upright in V1) or a left bundle branch block pattern (downward in V1). If upward in lead V1 (RBBB pattern), then VT is present in ...
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