Heartbeat premiered on NBC on March 22, 2016. Dr. Alex Panttiere is an outspoken world-renowned heart transplant surgeon and one of the few women in her field. Stubborn and fearless, Alex always operates on her own terms. She revels in a racy personal life that's a full-time job in itself, manages the daily demands of skeptical faculty and dutiful interns, and pushes the boundaries of medical science to impressive new heights.