Isovolumic relaxation phase of the cardiac cycle ends with
Peak of 'C' waves
Opening of AV valve
Closure of semilunar valve
Beginning of 'T' wave
Cardiac cycle events
1.    AV valves open – 
a.     End of isovolumetric relaxation
b.    Start of rapid filling phase
c.     ECG- end of T wave
d.    JVP- Y wave (V-Y descent)
2.    AV valves closure-
a.     End of diastole
b.    Beginning of isovolumetric contraction
c.     ECG- R wave later half
d.    JVP- End of X descent
3.    Semilunar valves open
a.     End of isovolumetric contraction
b.    Ejection phase starts
c.     ECG- ST segment
d.    JVP- the peak of ‘c’ wave
4.    Semilunar valve closure
a.     Systole ends
b.    Isovolumetric relaxation starts
c.     ECG- T wave later half