Background Time between onset of previous termcardiac arrestnext term and start of treatment is of ultimate importance for outcome. The length of time it takes to expose the previous termchestnext term in out-of-hospital previous termcardiac arrestnext term (OHCA) is not known. We aimed to compare the time from onset of OHCA until the time at which the previous termchestnext term was exposed using previous termanext term new device (S-CUT; ES Equipment, Gothenburg, Sweden) and previous termanext term pair of scissors. Methods In previous termanext term manikin study, the previous term2next term devices were compared in previous termanext term simulated previous termcardiac arrestnext term where the initial step was exposure of the previous termchest.next term The tests were performed using ambulance staff from 3 previous termdifferentnext term ambulance organizations in Western Sweden. Six previous termdifferentnext term types of clothing combinations were used. The primary choices of clothing for analyses were previous termanext term knitted sweater and shirt (indoors) and previous termanext term jacket with buttons, previous termanext term shirt, and previous termanext term college sweater (outdoors). Results The mean difference from onset of OHCA until the previous termchestnext term was exposed when S-CUT was compared with previous termanext term pair of scissors varied between 6 seconds (P = .006) and 63 seconds (P = .004; shorter with the S-CUT), depending on the type of clothing that was used. The mean differences for the clothing that was chosen for primary analyses were 23 and 63 seconds, respectively. Conclusion We found that previous termanext term new device (S-CUT) used for previous termexposing the chestnext term in OHCA was associated with previous termanext term marked shortening of procedure time as compared with previous termanext term pair of scissors.