Key Learning Points
ECG Waves P, Q, R, S, T
Vector Direction and Size Page 4
- The QRS complex represents right and left ventricular depolarization.
- The Q wave is the first negative deflection following the P wave.
- The R wave is the first positive deflection following the P wave.
- The S wave is the first negative deflection following the R wave.
Q Wave Page 5
- Septal Q waves are normal and are produced from depolarization of the top part of the septum(a).
- Q waves are the normal in certain ECG leads but can also be a product of dead or dying cardiac tissue.
