EKG Basics and Interpretation - part 5 doc

LBBB • "Complete" LBBB" has a QRS duration > 0.12s • Terminal forces (i.e., 2 nd half of QRS) are oriented leftward and posteriorly because the left ventricle is depolarized after the right ventricle • Terminal S waves in lead V1 indicating late posterior forces • Terminal R waves in lead I, aVL, V6 indicating late leftward forces