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P wave
atrial depolarisation, begins when SA node fires
QRS complex
ventricular depolarisation, 0.04 to 0.10 secs
J point
where ventricular depolarisation stops, and ventricular repolarisation starts
T wave
ventricular repolarisation
U wave
repolarisation of the Bundle of His and Purkinje fibers
PR interval
beginning of atrial depolarisation to beginning of ventricular depolarisation
P-P interval
time between atrial depolarisation cycles
R-R interval
time between ventricular depolarisation cycles
QT interval
one complete ventricular cycle
PR segment
end of atrial contraction and beginning ventricular contraction
ST segment
early phase of ventricular repolarisation