Like pal said there has been a sea change in the thinking. DIstolic used to be the enemy because the thought was that the short term PULSE that is the systolic was much less significant than the LOOONG rest period of the diastolic. This might still pertain in the young.
As we age, the vascular tree stiffens, (hardens if you will...or worse CONGESTS with plaque
) and the increasing systolic seems to mirror that stiffening. As pal said the pulse pressure (difference) might be a good way to get a handle on this dangerous stiffening.
Personally I think diastolic retains much value especially in a sensistive organ like the kidney which is engangered if it NEVER gets relief from pressure. Aneurism growth might be enhanced by high distolic but be immediatley endangered by high systolic.
But the coronary and cerebral aspects seem focused on systoles AT THIS TIME...stay tuned!