QR code: use of a novel mobile application to improve performance and perception of CPR in public.

The Quick Response Code (QR code) is the trademark for a ype of two-dimensional barcode that consists of black modles in a square grid on a white background. A QR code can be ead easily using a device like a mobile phone (usually a camra phone or smart phone) and was originally developed for ocument management and time or product tracking.1 A smarthone with a QR code scanner can display the code, convert it nto an uniform resource locator (URL) for a website, and play a video clip on the screen.1 A QR code can be simply manufactured without cost via an application or website. As a result, advertising strategies using QR codes have become popular because these codes provide quick and easy access to a brand’s website.1 We uploaded “CPR helper 2005” [The Korea National Emergency Agency (KNEA) produced a 2-min CPR video clip] on YouTube (http://www.youtube.com/). After uploading the video clip, the QR code was produced by NAVER QR code (http://qr.naver.com/). QRDroidTM version 5.3.3 (http://www.qrdroid.com) was downloaded on a GalaxyNote® smartphone (Samsung Electronics Co., Ltd., Seoul, Korea). QRDroidTM scanned the QR code and quickly accessed “CPR helper 2005” on YouTube. GalaxyNote® played the video clip on the screen Fig. 1. With the increased popularity of smartphones worldwide and the availability of highly sophisticated