Can LBBB cause ventricular tachycardia?

Can LBBB cause ventricular tachycardia?

The presence of a left bundle branch block, superior axis morphology further supported a diagnosis of ventricular tachycardia originating from the apex of the right ventricle.

How do you identify a bundle branch block on an ECG?

The characteristic ECG findings for right bundle branch block are as follows:

1. QRS duration is greater than or equal to 120 milliseconds.
2. In lead V1 and V2, there is an RSR` in leads V1 and V2.
3. In Leads 1 and V6, the S wave is of greater duration than the R wave, or the S wave is greater than 40 milliseconds.

How is left bundle branch block detected on ECG?

A simple way to diagnose a left bundle branch in an ECG with a widened QRS complex (> 120 ms) would be to look at lead V1. If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch block is present.

How do you tell the difference between a left and right bundle branch block?

You can distinguish between Left Bundle Branch Block and Right Bundle Branch Block simply by looking at the QRS morphology in V1 and V6.

• If the QRS looks like W in V1 and M in V6 it is LBBB. ( WiLLiam)
• If the QRS looks like M in V1 and W in V6 it is RBBB. ( MoRRow)

Which is worse LBBB or Rbbb?

Conclusions. In patients with LVEF<35%, RBBB is associated with significantly greater scar size than LBBB and occlusion of a proximal LAD septal perforator causes RBBB. In contrast, LBBB is most commonly caused by nonischemic pathologies.

What are shockable rhythms?

Shockable rhythms are rhythms that are caused by an aberration in the electrical conduction system of the heart.

How does the left bundle branch block ( LBBB ) ECG review?

Left Bundle Branch Block (LBBB) ECG Review. The ECG strip below shows normal sinus rhythm, then atrial fibrillation with a rapid ventricular response develops. With the faster heart rate, the QRS complex morphology changes to that of a LBBB. As sinus rhythm restores, and the ventricular rate slows, the QRS morphology returns to normal.

How big is a LBBB lead on an ECG?

LBBB is diagnosed on a 12-lead ECG. In adults, it is seen as wide QRS complexes lasting >120ms with characteristic QRS shapes in the precordial leads, although narrower complexes are seen in children. In lead V 1, the QRS complex is often entirely negative (QS morphology), although a small initial R wave may be seen (rS morphology).

How are right ventricular paced rhythms similar to LBBB?

Right ventricular paced rhythms will produce a similiar morphology, as impulse conductions originate from the RV and travel across the septum to the LV as is the case in LBBB. Pacing spikes will be present. The same concepts regarding appropriate discordance apply.

Can a ECG be used for left ventricular hypertrophy?

The presence of LBBB results in that electrocardiography (ECG) cannot be used to diagnose left ventricular hypertrophy or Q wave infarction, because LBBB in itself results in widened QRS complex, and changes in the ST segment consistent with ischemia or injury.