Bava Batra 148: Where's the Miracle? Deathbed Recoveries

Another deathbed case - if one signs away all of his property, without reserving anything for himself in case he would recover, what happens if he seems to be rethinking his decision -- if he then dies? If he recovers? Plus, more on the cases where the person on his deathbed recovers, and the ramifications for the gifts he has made, and so on. What about one who consecrates all his possessions to the Temple on his deathbed? If he recovers, do they revert to him? Also, if he declared all of his possessions ownerless?