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 ...

However, unlike in the presence of a left bundle branch block, myocardial ischemia and infarction can easily be detected on ECG when a RBBB is present.

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.

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.

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.

Left bundle branch block: This condition occurs when the electrical impulses to the heart’s left ventricle become slower. This can make it more difficult for the heart to pump blood efficiently ...

DEAR DR. ROACH: I am a 66-year-old woman who recently had an ECG prior to my knee surgery. The interpretation I received stated that I had an abnormal ECG with a “left anterior fascicular block ...

Left bundle branch block is a condition in which there's slowing along the electrical pathway to your heart's left ventricle.

Dear Dr. Roach: I am a 66-year-old woman who recently had an ECG prior to my knee surgery. The interpretation I received stated that I had an abnormal ECG with a “left anterior fascicular block ...