The ECG criteria for a left bundle branch block include: QRS duration greater than 120 milliseconds Absence of Q wave in leads I, V5 and V6 Monomorphic R wave in I, V5 and V6 ST and T wave ...

The ECG criteria for a right bundle branch block include the following: QRS duration greater than 120 milliseconds rsR’ “bunny ear” pattern in the anterior precordial leads (leads V1-V3 ...

Bundle branch blocks are abnormalities of the heart’s conduction system that show up an electrocardiogram (ECG), which is a tracing of the electrical activity in the heart.

A MUSTT substudy finds IVCD and LBBB on baseline ECG predictive of arrhythmic and total mortality, but LVH the only ECG parameter independently predictive of arrhythmic death.

Left Bundle Branch Block If your cardiologist spots LBBB on an EKG, they may run tests to figure out the cause. Unlike RBBB, left bundle blocks are more often a sign of tissue damage.

These Mayo Clinic experts illustrate how to identify LBBB on ECG, what measures to take to correct it, and novel developments in cardiac resynchronization therapy.

Right bundle branch block is a conduction abnormality with the heart that can result in an abnormal heart rhythm. Learn more here.

A left bundle branch block is a type of disruption of the heart's electrical impulses that can signal an underlying heart condition. Learn more here.

Typically, an LBBB is an indication of underlying disease, whereas the RBBB often occurs in normal individuals. However, in Brugada’s syndrome, an ECG tracing similar to the tracing of an RBBB ...

ECG 2 shows biphasic T-waves in the inferior leads, which suggests early reperfusion. The ST depression in V2/V3 are back to normal levels for a RBBB. Credit: Brady Pregerson, MD Figure 3.