The clinical manifestations of cardiac tamponade are threefold: firstly, jugular venous tamponade, caused by a significant increase in venous pressure due to tamponade, that is, the venous vessels of the neck. Second, the drop of arterial pressure, specifically, the pulse pressure becomes smaller and there are symptoms of tachycardia, if the development of serious heart will suddenly reduce the amount of blood, and then there is a risk of shock. Third, odd pulse, pericardial effusion patient’s radial artery pulse appeared specific performance, inhalation will be weaker than before or can not feel the pulse, when exhaling will be restored, this is odd pulse.