This was a single-center, observational study. Patients with successful cardiopulmonary resuscitation (CPR) will be transferred to the emergency intensive care unit for further standardized management. After successful return of spontaneous circulation (ROSC) for 72 hours and hemodynamic stability for 24 hours, the patients underwent positron emission computed tomography (PET-CT) examination after resuscitation. The supervising physician accompanied the patient and used monitors to monitor vital signs during the examination. Patients who were on ventilators were mechanically ventilated with a magnetic ventilator (HAMILTON-MRI, United States). In addition to conventional cerebral oxygen metabolism, cerebral blood flow, oxygen extraction fraction, cerebral blood volume and other indicators were added in this experiment. These indicators can evaluate the patient's cerebral metabolism, cerebral blood flow and cerebral blood oxygen damage degree. The neurological outcome was followed up 6 months after onset according to the cerebral performance category（CPC）.

Inclusion Criteria:

• age ≥18 years.
• sustained hemodynamic stability for ≥24h.
• the patients were unconscious and not able to obey verbal commands. • Advanced life support and target temperature management within 6 hours of return of spontaneous circulation (ROSC).

Exclusion Criteria:

• Patients with hemodynamic instability.
• Patients who could not complete cranial PET-CT examination for special reasons. • Patients during pregnancy.
• Patients who combined traumatic brain injury, stroke, cerebral hemorrhage and other diseases.
• Patients whose family members did not agree to be enrolled.

Patients after successful cardiopulmonary resuscitation (CPR) were transferred to the emergency intensive care unit for further standardized management.

all IPD that underlie results in a publication

starting 6 months after publication

The de-identified survey data will be made available for research purposes by contacting the corresponding authors