Key Learning Points
ECG Waves P, Q, R, S, T
QRS Variations Page 8
- A "R Prime" wave is the second upward wave after the R wave.
- A "S Prime" wave is the second downward wave after the R wave.
Q Wave, Abnormal Page 9
- Some Q waves are normal depending on which lead is viewed.
- A Q wave may indicate myocardial damage if it is wider than 0.4 seconds(a) or greater than 1/3 the height of the QRS(b).
