Rate

Rate-

-Normal Rate from SA Node 60-100

-Bradycardia- rate less than 60 originating from the SA node

-Tachycardia- rate greater than 100 originating from the SA node 

-When the pacemaker changes from the SA node it is referred to as an ectopic focus (different pacemaker)

-AV Node (Junctional Ectopic Focus)- also called junctional rhythm when comes from here.  Has an inherent rate of 40-60 beats per minute.  Faster than 60 is called junctional tachycardia.  Slower than 40 is referred to as junctional bradycardia.

-The ventricles have ectopic foci and are potential pacemakers.  The ventricular ectopic foci have an inherent rate of 20-40 beats per minute