Plata C, et al. - In this prospective, randomized, controlled, manikin trial, researchers assessed CPR quality in relation to the use of a smartphone application (PocketCPR) in a bystander CPR scenario vs dispatcher-assisted telephone CPR and uninstructed CPR. They used a manikin on whom 8-minute CPR was performed by 100 laypersons. Four groups were defined including randomly assigned volunteers: uninstructed CPR (uninstructed group), dispatcher-assisted telephone CPR (telephone-group), guidance and feedback through a smartphone application (app-group) and dispatcher-assisted telephone CPR combined with the smartphone-app (telephone + app-group). With regard to no-flow-time, compression rate, correct hand position, and thorax release, bystander CPR quality could be improved using feedback by a smartphone application. Also, this strategy did not delay CPR onset. No marked improvement in compression depth was achieved by using a smartphone application.