Matching Pairs Ch. 8 Cardiac Conduction Online version Cardiac Electrical System by Linu John 1 QRS Complex 2 T wave 3 P wave ventricular repolarization atrial depolarization ventricular depolarization 1 wave 2 interval 3 Isoelectric line 4 positive deflection 5 negative deflection 6 complex baseline or flat portion downward deflection upward deflection wave plus a segment several waves that are measured together deflection away from the baseline 1 SA node 2 AV Node 3 Bundle of His 4 Purkinje Fibers 5 Bundle Branches 20-40 bpm 60-100 bpm 40-60 bpm (step after SA node) 40-60 bpm (named after a MD) 40- 60 bpm (has two routes) 1 PR Interval 2 R-R interval 3 QT interval 4 ST segment 5 QRS Interval should stay at baseline 0.36 to 0.44 second 0.12- 0.20 second should be regular less than 0.12 second