Rejoining the server...

Rejoin failed... trying again in seconds.

Failed to rejoin.
Please retry or reload the page.

The session has been paused by the server.

Failed to resume the session.
Please retry or reload the page.





Bundle Branch Block Determination II ECG Interpretation


Steps 1-3

Changes specifically seen include the QRS complex measuring 0.12 seconds or greater due to this delay. When determining the presence of BBB there are just a few simple steps to follow.

  • Step 1: Refer to lead V1
  • Step 2: Look for evidence that the electrical activity started above the ventricles (P wave). This is sometimes referred to as supraventricular activity.
  • Step 3: QRS complex measures 0.12 seconds or greater (not including aberrant complexes i.e. PVCs)

Steps 1-3 (continued)

By following the previous three steps, you will be able to determine whether a BBB is present or not.

Now it is simply a matter of one more step when analyzing the QRS in V1 to distinguish whether it is a left BBB or a right BBB.




Authors and Sources

Authors and Reviewers


Sources





ns: 1 | sp1: C | c:


This website provides professional medical education. For medical care contact your doctor. 2026 ©MedEdu LLC. All Rights Reserved. Terms & Conditions | About Us | Privacy | Email Us | 1 | n 1 |

  • mededu company logo
  • facebook like
  • twitter like
  • linkedin like
  • email share