Hey there - You already know the results by now I would imagine, since you posted a couple weeks ago, but for future knowledge, the earlier in the incubation that the temp spikes, the better chance you have of the embryo surviving because of the water content of the egg and the humidity. The water has a buffering effect and chances are, if you caught it quick enough, the actual embryo, suspended within the watery white, covered by two membranes and then the shell itself - may not have suffered as severe a temp elevation as you would fear.
This is a catch 22 though, because the embryo is most fragile at this point so I would say you probably lost most. Please let me know what happened. I am thinking you should get about 1 out of 5 to hatch, or 20% success rate for your total clutch.