I see wide gaps in D/S. My understanding is that it is my body’s way of coping to make everything fit in the tubes (blood vessels) at an ideal pressure. A consistently wide D/S gap over a certain amount is also a risk factor for stroke. My brain can’t remember what the gap is exactly at this moment but it is wide. The other wxplaination I know of for a wide D/S is heart related. Potentially, one part of the heart may not be working at full copacity so there is a huge let off in pressure in the “relax” phase of a heart beat. Again, many concussions later, I think this had something to do with left ventricular dysfunction. I am not a doctor. I am just a well read advocate for myself. Unfortunately much of that research is locked in the concussion files at the moment.