What causes sinus rhythm with wide qrs?

Sinus rhythm is the normal cardiac rhythm that emanates from the heart's intrinsic pacemaker called the sinus node and the resting rate can be from 55 to 100. A widened QRS interval.( over 0.10 seconds) is caused by delayed conduction of the electrical stimulus from the upper chamber which causes a delay in contraction of the ventricles. This can lead to terms like IV conduction delay or BBBB