For cardiac arrest patients, after cardiopulmonary resuscitation to determine whether cardiac compression is effective, either extrathoracic or intrathoracic cardiac compression, cardiac compression is effective performance is mainly divided into the following aspects: 1, the aorta can be touched to the beat, usually touching the carotid artery or the femoral artery; 2, can be measured blood pressure is usually systolic blood pressure ≥ 60mmHg; 3, cyanosis lips gradually turned red; 4, dilated pupils began to narrow, and even voluntary respiration; 5, coma becomes shallow or reflexes and struggles appear; 6, ECG graph appears to improve. As long as the first two indicators appear, you should continue to insist on cardiac compression.