Xylopia can be seen in organic encephalopathy, schizophrenia (especially the catatonic type), depression, dysthymic psychosis, and acute stress reactions. Attention should be paid to differentiate the etiology. 1.Clinical manifestations and signs The patient complains of stuffy pain in the precordial region, dyspnea, irritability, oliguria to anuria, pallor, rapid and weak pulse, sometimes an odd pulse can be detected; blood pressure decreases or cannot be measured, but the venous pressure is elevated and exceeds 1.47 kPa (15 cmH2O). 2, diagnosis In patients with closed chest injury, where there is: (1) elevated venous pressure; (2) weak heartbeat and distant heart sounds; (3) decreased arterial pressure. When pericardial compression is suspected, pericardiocentesis can be performed next to the left costal arch under the saber and the diagnosis can be confirmed if blood is withdrawn. Two-dimensional echocardiography can also confirm the diagnosis of pericardial effusion. Acute pericardial tamponade is often critical, so pericardial puncture can be performed first to relieve the symptoms, while blood and fluid can be transfused to try to save the time for thoracotomy.