There are many smartphone-based applications (apps) for cardiopulmonary resuscitation (CPR) training. We investigated
Sudden cardiac arrest (SCA) remains a leading cause of death in developed countries, including South Korea, despite efforts devoted to prevention of SCA [1–3]. Although there are many factors that dictate the outcomes of SCA, it is well known that survival rates are up to three times higher when cardiopulmonary resuscitation (CPR) is performed immediately after SCA [4, 5]. Various methods for demonstrating highquality CPR and immediate recognition of cardiac arrest, including face-to-face training and video-based instruction for bystanders, have yielded improvement in participation rates during incidents of SCA [6, 7]. However, only 12–42% of cardiac arrest patients witnessed by the layperson received
CPR during out-of-hospital cardiac arrest (OHCA) [8–10].
The low rate of layperson intervention may be due to a failure
to recognize cardiac arrest or a lack of confidence due to
insufficient CPR training/education [11].