I. RIGHT BUNDLE BRANCH BLOCK
D. Incomplete Right Bundle Branch Block
In incomplete RBBB, the QRS duration is 90–115 ms, causing other symptoms similar to complete RBBB. It is commonly associated with atrial septal defect. Incomplete RBBB is a common ECG finding in normal individuals. Straight back syndrome, pectus excavatum, coarctation of the aorta, right ventricular volume overload, and muscular dystrophy may also be associated with incomplete RBBB.