Water changes througout will help the fish deal with any stress from the salt and heat. Just make sure you add in salt to replace that which you take out.
I agree with Mark, I've never seen heat alone work. Heat just speeds up the life cycle of the parasite. Which means if you up the heat and don't add anything to kill the parasite you'll just infect more of your fish. So, in the first few days you will see more spots than you initially had, which typically freaks people out and makes them buy a chemical. But staying the course is what matters. It is my understanding that the life cycle takes about two weeks at the higher temperatures, but could take up to 3 weeks depending on how high you raise the temp. Adding the salt will kill off only eggs and young larvae if I remember correctly, so it is extremely important that you keep the salt concentration up (1 tblsp for every five gallons roughly) for the duration of the time period. Just like antibiotics, don't stop just because it seems better. You have to complete the course.
If you're worried about the stress of heat, add in a few air stones or increase your filter flow if you can. These things will help the fish to cope with the stress.
