The purpose of this clinical study is to investigate how performing chest compressions affects the ability to perform mental tasks. In particular, the effect on the participant's ability to perform mental arithmetic will be investigated. The aim is to draw conclusions about the effects of chest compressions on other mental tasks.

2 How does the clinical trial work? This clinical trial will be conducted in several locations and will involve a total of approximately 76 people in two sub-studies (38 people each). The study will be conducted by the Department of Anesthesiology of the Medical University of Vienna.

Participation in this clinical study is expected to last 30 minutes.

The following measures will be carried out exclusively for study reasons:

Depending on the sub-study you are participating in, different tasks will be performed:

Adult sub-study:

During this study, participants will be asked to perform mental arithmetic: Participants will be read a number every 2 seconds and have to add the last two in each case. The numbers are predetermined and randomly generated. At the end, we will evaluate how many results were correct.

Inclusion:

• Healthy medical professionals trained in CPR (paramedics, prehospital emergency physicians, anesthesiologists, internal medicine doctors, nurses, midwifery students)
• CPR Training in the last four years
• Fit and rested.

Exclusion:

- Pregnant probands