-
P-wave?
- atrial depolarization
- SA node stimulates right atria to contract (up-phase) followed by left atria (down-phase)
- Repolarization not seen on ECG (within QRS)
-
QRS complex?
ventricular depolarization
-
Q Wave?
- Downward deflection ALWAYS
- Depolarization of interventricular septum
- Used to detect old MI (> 0.04 sec & > 25% of R-wave)
- Not always present
-
R & S-waves?
- R-wave (1st) large upright deflection
- S-wave negative deflection following the R wave
- Represent depolarization of R & L ventricles
-
T- Wave?
ventricular repolarization
-
U Wave?
wave further repolarization of ventricles
-
PR segment?
- from beginning to right before the Q wave dip
- the time required for the impulse to leave the SA node travel through the atria, AV node, bundle of HIS, bundle branches and Purkinje fibers
-
ST Segment?
end of ventricular depolarization and ventricular repolarization
-
QT Interval?
ventricular depolarization and repolarization
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