Data collection
cardiac arrest
CARDIAC ARREST
The quality of chest compressions (depth and rate) were measured by the AMBU CPR software and were analyzed retrospectively based on the recorded reports. For calculating proportions of correct chest compression parameters, software recorded data were dichotomized to „correct” (within the intervals described in the guidelines) and „incorrect” (outside the intervals described in the guidelines) categories. Scenarios were also video recorded and analyzed by assessors who were emergency professionals (two paramedics) familiar with Basic Life Support (BLS) education who are familiar with CPR quality assessment. For recording, a camera (Nikon D750, Nikon Corporation, Tokyo, Japan) with a resolution of 1920 × 1080 pictures was pre-installed on a tripod in the room. The camera picture covered the room entrance, the manikin and the activity of the participants. At this latter point, correct hand position during CPR, time of check the breathing, time to call the ambulance and time to the first chest compression were measured. For time-related data, the clock was started when the participants entered the room and stopped after 2 min of chest compressions.Sociodemographic data (age, body weight and height, prior first aid training, prior real-life CPR experience) were collected by a study assistant immediately after the scenario. Collected data were anonymized. In addition, self-assessment in all groups, and experiences and attitudes related to dispatcher-assisted CPR in T-CPR and V-CPR groups were also measured by filling out an online survey after the scenario (5 items for U-CPR; 6 items for T-CPR and V-CPR). For filling out the survey, a tablet (iPad Air 8th Gen, Apple Inc., USA) was used with the assistance of a study operator. A 4-point Likert-scale was used in the following questions: (1) “How did you feel during the scenario?”; (2) “How calm were you during the scenario?”; (3) “Did you perform CPR in the right way?”; (4) “Were the dispatcher’s instructions useful for you during the scenario?”; (5) “Would it be useful to get instructions from the dispatcher during the scenario?”; (6) “How motivating was it to communicate with the dispatcher during the scenario?”. A “Yes/No” answer could be given to the following question: “Would you use the V-CPR method in a real cardiac arrest situation?”.