In this instructable I will just cover how to basically use it and some other facts. This instructable should be used in conjunction with the CPR instructable.
Step 1: What is the AED for?
V-tach is when the ventricles pump so fast the blood cannot circulate properly.
V-fib is when the ventricles quiver or shake in an unorganized way so the blood cannot circulate properly.
The AED puts a shock through the heart so it stops and restarts so the heart can re-set and pump normally again. It cannot be used for someone who's heart has stopped completely.
Both V-tach and V-fib will show no pulse because the blood cannot circulate properly so you won't be able to tell if it's V-tach V-fib or stopped completely. The AED however can tell so it will be able to do the right amount of shock.