Jennifer Matthews: Jim Hultman loves spending time with his dog, Bud.

Jim Hultman: Having a dog is just a wonderful experience. He is the best.

Jennifer Matthews: He's lucky to have enough energy to keep up with Bud.

Five years ago, Jim had a heart attack.

Jim Hultman: My health history before the heart attack is like ... nothing.

Jennifer Matthews: Jim joined a clinical trial with Dr. Paresh Dandona, who gives more than standard drugs to heart attack patients. He also gives them insulin -- a treatment commonly used by diabetics.

The insulin is infused insulin for 48 hours after the attack.

Dr. Paresh Dandona : Insulin is probably going to turn out to be more effective than all of those drugs.

Jennifer Matthews: Insulin dramatically reduces inflammation. When given within three hours of a heart attack, low doses reduce heart damage by 50 percent.

Dr. Paresh Dandona: There may be a substantial chunk of that heart muscle which is subject to potential injury that might be saved if you get in there on time.

Jennifer Matthews: Today, Hultman does everything he did before his heart attack. His goal now is to reduce stress with a little help from Bud.

Jim Hultman: Bud and I go probably four times a week for at least 30 minutes.

Jennifer Matthews: A healthy lifestyle that's added protection for his heart.

This is Jennifer Matthews reporting.