Hello
It's not that simple.
Damage at M.S. depend on the vein sinus rektus ( http://en.wikipedia.org/wiki/Straight_sinus ). Plays an important role ( http://it.wikipedia.org/wiki/Arteria_anonima ). Must be controlled the way the blood that causes damage.
I am sorry I am not feeling well. I can't give more information at the time,
I have to rest. Sorry.
Regards
Rici