The intensive care unit is a specific ward in many ways. Unlike other departments, the ICU must be organized in order to be as closely as possible connected with other departments and activities (operating room, emergency room, sterilization, laboratory ...), specific medical procedures are provided (tracheotomy, bronchoscopy), it is the only ward where patients are mechanically ventilated and are used other devices that are not used in other wards (ECMO, dialysis ...). In addition, patients are of the third and fourth categories and thus nursing care is enhanced and patients are monitored 24 hours a day. The aim of this paper was to investigate, i.e. to examine the attitudes and knowledge of nurses in intensive care units at the Clinical Hospital Center Rijeka in Sušak, Rijeka and Kantrida locality. In line with the goal, hypotheses were made; H1 - nurses / technicians are confident in their knowledge required to work in ICU H2 - nurses / technicians are satisfied with the organized training required to work at ICU. Respondents were nurses / technicians from the intensive care unit from Sušak, Rijeka, Kantrida, and were interviewed via an anonymous questionnaire. Based on the results obtained, it can be concluded that both hypotheses were accepted with the additional emphasis that nurses / technicians should be encouraged to receive continuing education, participate in congresses, courses and explain the importance of the same.