journi would get that new heart.t that heart into multiple recipients at that point. >> reporter: those recipients, margaret and kensley. how did you feel about helping these two, too? >> i'm happy that i did. >> reporter: that piece of her heart probably saved your life. >> probably did. >> that's what my daddy said. he said this heart surgery would save my life. >> reporter: 9-year-old kensley was born with a heart deflect and had her first operation at 2 weeks old. one of journi's valves would replace kensley's valve. 14-year-old margaret, a cross country runner thought she had a stomach bug but ended up in the e.r. >> i had a staph infection and had enndo carditis. it's when the staff gets into your heart. >> she needed a new mitral valve. it looks like a parachute attachched to mule by pieces that resemble cords. >> it's a more difficult valve to access. >> reporter: doctors had never transplanted a living mitrol valve in anyone. >> you think about the thousands of children this could held. help in the future. >