Podsiadło P, Smoleń A, Kosiński S, et al. - In this study, the effect of the occurrence of cardiac arrest associated with initial management on the outcome of severely hypothermic patients who were rewarmed with Extracorporeal Life Support (ECLS) was tested. Researchers obtained the individual data of patients in a state of severe accidental hypothermia who was found with spontaneous circulation and rewarmed with ECLS, from cardiac surgery departments. Individuals were classified into two groups: those with a subsequent cardiac arrest (RC group); and those with the retained circulation (HT3 group) and compared by using a matched-pair analysis. They enrolled a total of 124 patients in the study: 45 in the HT3 group and 79 in the RC group. In severely hypothermic patients, the occurrence of rescue collapse is linked to a doubling of the risk of death. The data demonstrate that the procedures which are known as potential triggers of rescue collapse should be conducted with special attention, including in conscious patients.