electrocardiogram: left bundle branch block rSR' rSR' or broad slurred R wave in leads V4, V5, and V6
electrocardiogram: left bundle branch block rsr' rsr' or broad slurred r wave in leads v4, v5, and v6
LBBB rSR', rSR', or broad slurred R wave in V4-6
lbbb rsr', rsr', or broad slurred r wave in v4-6