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 ...

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 ...

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.

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.

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.

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

DEAR DR. ROACH: I am a 63-year-old male who, during a routine EKG, showed a left bundle branch block. Can you tell me anything about this diagnosis, what it means, any treatment, future concerns ...

When a left bundle branch block appears on an ECG, the next step is usually an echocardiogram. This noninvasive imaging test shows whether the heart structure looks normal.

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.

Q. Please explain a bundle-branch block on the left side of my heart. Cause? Cure? Complications? After viewing my EKG, my anesthesiologist referred to the condition as a heart abnormality and sugg… ...

Dear Dr. Roach : I am a 63-year-old male who, during a routine EKG, showed a left bundle branch block. Can you tell me anything about this diagnosis, what it means, any treatment, future concerns ...