On May 12, 1997, Deborah Daw Heffernan felt her heart explode. At the age of 44 and in the middle of her weekly yoga class, she was having a massive heart attack. Deborah is alive today only because of medical technology and research supported by groups like the NASPE-Heart Rhythm Society. In their 25 years, this membership organization of more than 3500 heart rhythm specialists has saved countless lives by bringing critical research on pacing and electrophysiology from the lab bench to the patient's bedside. In this episode of The Visionaries, Deborah Daw Heffernan, author of the bestseller "An Arrow Through the Heart," recounts her extraordinary journey from near-death back to life, while the staff at the NASPE-Heart Rhythm Society shows just how far they've come in keeping patients' hearts like Deborah's beating strong.