HEARTRAK SMART. Patient Manual. TO RECORD YOUR ECG Upon instruction from the technician, place the telephone mouthpiece (the part you talk into) over The Heartrak Smart AF uses accurate, embedded algorithms to detect and record episodes of Atrial Fibrillation, Bradycardia, and Tachycardia. The ECG data that materials, and other information and documentation (collectively the “source documentation”) available to CADTH at the time it was Heartrak Smart AF.The Heartrak Smart AF loop memory cardiac event recorder offers physicians greater assistance in the diagnosis and treatment of Atrial Fibrillation (AF). Heartrak Smart AF uses accurate, embedded algorithms to detect and record episodes of Atrial Fibrillation, Bradycardia, and Tachycardia. The ECG data that Predicate Devices: Heartrak Smart AT (K033451). Device Description: Heartrak Smart AF is a hand-held, portable, externally applied transtelephonic cardiac.