A tip for those on 2-4:
Remove the first two aneurisms.
Now, two new ones will pop up...or something like that. Shrink and use the scalpel on them, but DO NOT remove them. Once you have shrunk and scalpeled both on the screen, remove them until new ones pop up. Do the same for these, and remove once all are shrunk. Now the nure will tell you that the operation is done. Suddenly a buttload of aneurisms pop up and she spazs out. This is the tough part.
As soon as you gain control, zoom out and activate healing touch. Now, quickly zoom into a spot where you have access to 3 or more aneurisms. Shrink them and scalpel them. If they get really big, shrink them and them shrink others, as to avoid them bursting. The key is speed. Once you scalpel all (5, I think) aneurisms, all you have to do is make sure his vitals are stable, and remove, suck, and patch. If you lose, don't give up. It is pretty easy.
Here's another tip- when you're doing the second wave an aneurisms, get his vitals up high. Then you're less likely the have to stabilize them while in healing touch, losing time and risking a rupture.
Just a little help for those who may be having trouble, I know I did.
Edit: Now I'm stuck on the one where you have to remove the GUILT from Amy in two locations. I can get it out of the first area no problem. But I always run out of time on the second one. Argh!