Operačné stredisko záchrannej zdravotnej služby (Operačné stredisko ZZS SR) is a renowned organization in Slovakia that is dedicated to saving lives and providing emergency medical services. As the central hub for emergency calls, they operate the emergency hotline 155, which is available 24/7. The organization offers a range of services to ensure the well-being of the public.

These services include providing first aid, offering information on emergency situations, processing personal data, and conducting vital life support courses. They also operate an application called 155. sk, which provides information on emergency services and functionalities for reporting incidents.

In addition to their services, the Operačné stredisko ZZS SR is actively involved in various projects aimed at improving the efficiency and effectiveness of emergency medical services. They also organize competitions, such as the Nájdi svoje AED, to promote awareness about the importance of automated external defibrillators (AED) in saving lives. With their experienced operators and commitment to public safety, Operačné stredisko ZZS SR plays a crucial role in ensuring the health and well-being of the Slovakian population