ECG Findings

• QRS duration > 0.12 seconds
• rsR’ complex in V₁ (as seen in RBBB) 
• Sometimes a slurred R wave or a qR complex in V₁
• Sometimes the S wave in V₆ is a mirror image of that in lead V₁
• Left axis deviation
• Small q waves in aVL and rS complex in leads II and III
• Positive T waves in aVF
• Clockwise rotation in the precordial leads, commonly with an rS complex absent Q wave in leads V₅ and V₆

Bilateral Bifascicular Block of the RBBB + LAFB Type

Case 1

67-year-old man with bilateral bifascicular block (complete RBBB + LAFB type)

67-Year-Old Man With Bilateral Bifascicular Block ECG

Figure 2.

Table 0-1 ECG findings of Case 1 (see Figure 2).