Patients resuscitated from a cardiac arrest undergo therapeutic hypothermia as a treatment option. Measuring the cardiac output in these patients is sometimes important, but difficult, as these patients require an invasive device for measurement. Recently, a non-invasive device based on pulse-contour analysis of the arterial pulse was developed (the Vigileo). Hypothermia changes the pulse contour, so the performance of the Vigileo in patients with induced therapeutic hypothermia is not known. Therefore we conduct this observational study in which the cardiac output of the patients is measured with the traditional method and the Vigileo simultaneously.

Inclusion Criteria:

• patients who survived a cardiac arrest and are treated with therapeutic hypothermia
• pulmonary arterial catheter placed by treating physician

Exclusion Criteria:

• arterial catheter placement is contraindicated
• Aortic valve insufficiency (moderate to severe)
• placement of intra-aortic balloon pump (IABP) or a LVAD (left ventricular assist device)

Patients after cardiac arrest who are treated with therapeutic hypothermia and require a PAC for hemodynamic monitoring