Intravascular Clotting (POCUS) - Marker of the Timing and Severity of Cardiac Arrest; Indicator of Futile Resuscitation

The scientific goals of the project: 1. ultrasound assessment of the incidence of clotting in deep veins in patients after cardiac arrest during resuscitation and after the declaration of death; comparison to the incidence of clotting in the heart cavities 2. comparison of resuscitation results in patients with and without clotting detected in deep veins during resuscitation 3. determining the time from cardiac arrest to the occurrence of clotting in deep veins; comparison to the time until clotting occurs in the heart cavities Confirmation of the usefulness of the ultrasound-detected clotting in deep veins during resuscitation in assessing the severity of cardiac arrest and the prognosis of resuscitation, which is the aim of the project, will have an impact on international guidelines for determining the prognosis and potential futility of resuscitation.