1859, action of barring; man-made barrier in a stream, from French barrer to stop, from barre bar, from Old French barre (see bar (n.1)). Artillery sense is 1916, from World War I French phrase tir de barrage barrier fire intended to isolate the objective. As a verb by 1917.
What happens in cardiac arrest. 1  Once the usual blood circulation stops, oxygen delivery to all vital organs is also stopped. 2  The pulse that is usually seen in the carotid artery in the neck as well in the wrists and ankles is lacking. 3  Cardiac arrest may lead to sudden cardiac death or SCD.
Many heart attack victims can be saved from cardiac arrest if appropriate first aid is used. If you think someone is having a heart attack: 1. Have the person sit or lie down. Rest will relieve the heart of unnecessary stress. 2. Loosen any of the victim's clothing that might restrict blood flow.