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scorebuilders ch 3

Cardiac Cycle One complete period of depolarization and repolarization of the cardiac muscle cells
P wave Atrial depolarization
PR Interval Time required for conduction from the SA node to AV node. THe time between atrial and ventricular depolarization. This is normally .12 to .2 seconds
QRS Complex Ventricular depolarization and atrial repolarization
QT Interval Electrical systole that is measured by the time elapsed from the start of the Q wave to the end of the T wave. This is normally .32 to .40 seconds
ST Segment Delay before repolarization of the ventricles; useful in assessing myocardial ischemia
T Wave Ventricular repolarization
ECG Surface electrodes record the electrical activity of the heart. A 12-lead ECG provides 12 views of the heart; it is used to asses cardiac rythym, to diagnose the location, extent , and acuteness o myocardial ischemia and infarction; and to evaluate changes with activity