Basic life support (BLS) skills are crucial not only for healthcare workers but for all lay people as well. Timely recognition of out-of-hospital cardiac arrest and the initiation of BLS by bystanders before the arrival of healthcare personnel can improve survival.

There are several methods of spreading BLS skills and improve BLS skill retention among lay people. One of these methods can be educating school children. The introduction of mandatory BLS education in schools was very effective in some European countries to increase the rate of bystander BLS.

The current study aims to investigate the efficacy of a BLS training and BLS curriculum among high school children in Hungary. Moreover, the investigators would like to optimise factors influencing skill retention in this first responder group and aim to compare two types of teaching methods: feedback given by the instructor or software-based feedback on the efficacy of chest compressions during the course.

Inclusion Criteria:

• High school teenagers participating in the education of Óbudai High School, Budapest
• Written informed consent received from participants and their parents to participate in the study

Exclusion Criteria:

• No written informed consent provided by the student or parent
• Any injury or health issue influencing the efficacy of BLS skill