My AME said the same to me. He looked at the trace and said "has anyone ever said right branch block to you" to which I replyed what's that! He then said it was probably due to the positioning of the leads and moved them around a bit. He then ran the machine again and it came back ECG normal!!! However I was assured by him that even if it was RBB it wasn't a problem. I did ****e my pants when he said it though
Tug