To quickly assess the patient's cardiac function and structure through ultrasound

Monitor the peripheral arterial pulse and flow velocity, monitor the patient's lung and diaphragm muscle movement, monitor the patient's optic nerve sheath and cerebral blood flow, observe the morphology and blood flow of the liver and kidney and other parenchymal organs, Comprehensive evaluation of patient resuscitation quality.

For patients with cardiac arrest undergoing Cardio Pulmonary Resuscitation (CPR), the above monitoring was completed by ultrasound, and compared with the parameters obtained by end-expiratory carbon dioxide (ETCO2) and compression feedback device, to evaluate the feasibility of ultrasound to evaluate the quality of CPR. After the reliability evaluation was completed, parameters were further used to guide CPR quality improvement through ultrasound, end-expiratory carbon dioxide (ETCO2), and compression feedback device.

Inclusion Criteria:

• Voluntarily participate and sign a written informed consent;
• Male or female above 18;
• Patients who are sent to the emergency room of our hospital with symptoms of "cardiopulmonary resuscitation";

Exclusion Criteria:

• There is trauma in the ultrasound examination site and it is not suitable for ultrasound examination;
• Entering the emergency room without vital signs for more than 30 minutes;
• The appearance of corpse corpses;
• There is life-threatening and irreversible damage;
• Other investigators consider it inappropriate and the patient or family member refuses;

Emergency Department patients