A. Inclusion criteria for observational part | |
 1. Cardiac arrest is caused by respiratory failure or hypovolemic shock; | |
 2. In-hospital cardiac arrest; | |
 3. Aged 18–85 years old; | |
 4. Patients with return of spontaneous circulation (ROSC) that is sustained for ≥ 20 min; | |
 5. Glasgow coma score ≤ 8 after ROSC, and before sedation (if any) ; | |
 6. The legal representative signed the informed consent; | |
 7. Advanced cardiovascular life support is conducted. | |
B. Exclusion criteria | |
 1. No-flow time > 10 min (time from collapse to initiation of external cardiac massage); | |
 2. Low-flow time > 60 min (time from initiation of external cardiac massage to ROSC); | |
 3. Major hemodynamic instability (defined as a continuous epinephrine or norepinephrine infusion at a flow rate > 1 μg/kg/min); | |
 4. Cardiac arrest caused by advanced tumor and other end-of-state diseases; | |
 5. Cardiac arrest caused by an irreversible cause (such as severe trauma and poisoning); | |
 6. Cardiogenic cardiac arrest (acute infarction, malignant arrhythmia, heart failure, etc.); | |
 7. Acupoint with lesions, wounds, or skin diseases affects acupuncture; | |
 8. Allergic persons, or known to be allergic to treatment, such as metal; | |
 9. Pregnant or lactating women. |