From: Rabbi Akiva Eiger
To: Rabbi Leib Eiger
Rabbi Akiva Eiger argues that the Rema's ruling that a consecration declared "from today and after thirty days" is "not sanctified at all" means the donor may retract unilaterally before the thirty days elapse, without any she'eilas chacham, because the hatpasah mechanism has not yet taken effect. He also engages extensively with the Rashba's contradictory positions on whether amiraso l'gavoha applies to hekdesh aniyim, finding no fully satisfying harmonization.
Source: Shu"t Rabbi Akiva Eiger §144