Conduction abnormalities

Question 1

Complete RBBB

Answer 1

• RSR prime in V1 and V2 (leads over the RV) with reciprocal negative ST-T changes
• QRS > .12 sec for complete RBBB
• terminal S waves in lead I, aVL and V6 (left leads)
• terminal R wave in aVR
• if LAD, think left ANT fascicular block
• if RAD, think right POST fascicular block

Question 2

Incomplete RBBB

Answer 2

same as RBBB but QRS is normal duration (.10-.12 sec)

Question 3

ST-T changes in the SAME direction as RBBB morphology

Answer 3

label as primary ST-T wave abnormalities