EKG Atlas-RBBB

This page contains a classic EKG of a patient with right bundle branch block(RBBB). The criteria of RBBB follow the EKG.

Duration
1. Complete RBBB is > 0.13 sec.
2. Incomplete RBBB is between 0.09 and 0.12 sec.
Morphology
1. Precordial leads
  - V1 = rsR' with CRBBB or V1 = rSr' with IRBBB.
  - V6 = qRs with CRBBB or IRBBB
2. Limb leads
  - Axis can be right, left, or normal.
  - Ignore terminal 0.08 vector when calculating axis.
  - Lead I = qRs.
3. Orthogonal leads
  - Lead X = qRS (with IRBBB = qrS)
  - Lead Z = qRS (with CRBBB = qRs)

III. Conduction abnormalities

Both LAFB and LPFB can occur with RBBB using usual criteria.
LVH, ASMI, AMI, ACMI, and IMI can all be diagnosed with RBBB using usual criteria.

[EKG Atlas]