The significance can be an incomplete bundle branch
block and sometimes indicates underlying
heart disease; especially when it occurs on the right side (i.e., incomplete RBBB,) it often has no significance at all. So in general, incomplete bundle branch block should begin a routine non-invasive search for underlying heart disease. If none is found, no further tests or treatment are needed.
If your husband hasn't had symptoms of skipped heartbeats, irregular fast heart rate, etc.