US AND THANK YOU TO ABBY AS WELL. >>> WE DO WANT TO TURN TO OUR "GMA" COVER STORY AND HOW ONE MOM SAVED HER OWN DAUGHTER'S LIFE PERFORMING CPR WHEN THE 17-YEAR-OLD WENT INTO CARDIAC ARREST AT A CHEERLEADING COMPETITION. JACLYN LEE BACK WITH THAT STORY. JACLYN, GOOD MORNING. >> Reporter: WHIT, GOOD MORNING. IT WAS A STORY INCREDIBLY SCARY FOR ONE MOM BUT IT DOES HAVE A HAPPY ENDING REMINDING EVERYONE OF THE IMPORTANCE OF SPRINGING INTO ACTION. THIS MORNING, ANDREA JOE, THE NORTH CAROLINA MOM WHOSE QUICK THINKING SAVED HER 17-YEAR-OLD DAUGHTER'S LIFE AT A CHEER COMPETITION IS SPEAKING TO "GMA" ABOUT THE IMPORTANCE OF LIFE-SAVING CPR. >> HER COACH CAME RUNNING OUT OF THE DOOR, THE SIDE DOOR, JUST FRANTICALLY SCREAMING, SOMEBODY GET AN AMBULANCE. WE NEED AN AMBULANCE. >> Reporter: HIGH SCHOOL SENIOR KEIANNA JOE WAS WARMING UP SUDDENLY BECOMING UNRESPONSIVE GOING INTO CARDIAC ARREST. >> WHEN I CARTWHEELED I GRIPPED ON TO MY BASE AND I DIDN'T LET HER GO. THAT'S WHEN THEY KNEW SOMETHING WAS WRONG. >> Reporter: ANDREA SPRINTING TO HER SIDE AND PUTTING HER CPR AND AED TRAINING TO THE TEST. >> I'VE BEEN TRAINED ON AN AED DEVICE AND KNEW AT THAT MOMENT SHE NEEDS THIS. WHEN I HAD GIVEN HER HER SECOND BREATH AFTER THAT CPR, SHE DID TAKE KIND OF A BIG INHALE. SHE KIND OF WAS LIKE BIG INHALE AND I WAS LIKE, OKAY, WE GOT HER BREATHING. >> Reporter: ACCORDING TO CDC, ACROSS ALL AGES, 70% TO 90% OF THOSE WHO SUFFER CARDIAC ARREST OUTSIDE OF A HOSPITAL SETTING DIE BEFORE THEY EVEN REACH A HOSPITAL. AND IN YOUNG ATHLETES, SUDDEN CARDIAC ARREST, ALTHOUGH RARE, IS THE LEADING MEDICAL CAUSE OF DEATH ACCORDING TO THE MAYO CLINIC. FOR KEIANNA, SHE SPENT A WEEK IN THE HOSPITAL RECOVERING. DOCTORS IMPLANTING A DEVICE THAT CAN DETECT ABNORMAL HEART RHYTHMS. THE MEDICAL TEAM CREDITING HER MOM ANDREA FOR THE TRAINING. >> I HAD THE CONFIDENCE TO GO IN KNOWING, I CAN DO THIS, INSTINCT JUST TOOK OVER. >> AND KEIANNA IS AT HOME RECOVERING. DOCTORS DON'T KNOW WHY SHE WENT INTO CARDIAC ARREST. EVER SINCE THE DAMAR HAMLIN INCIDENT IN FEBRUARY, THERE'S BEEN A NATIONWIDE PUSH TO HAVE AEDs AND CPR-TRAINED PEOPLE