All my best wishes, devriesj!
My father died after he had to undergo an pancreatitus operation. Actually, he survived the opration by two years: it was a change of 10:90 that he survived, because he went years to late to the hospital - being a hospital surgeon himself.
This, however, happened some time ago.
I'm sure, your father is been looked at at the best! And when he can leave the Intensive Care, tell him to take care of himself, since you all need him!
(I suppose, we didn't tell this my father clearly enough
)
All the very best for you - and even more for your father!