Cardiac event at the end of isometric relaxation phase:-

Cardiac Cycle: Phase of cardiac cycle ECG changes Valves JVP Hea sound Atrial systole or last phase of ventricular diastole P wave PR interval - a wave 4th Isometric ventricular contraction QRS complex Stas with AV valve closure c wave due to bulging of AV valves back to atria 1st Rapid ventricular ejection ST segment Semilunar valve opens x descent - Slow ventricular ejection T wave - - - Protodiastole + isometric relaxation - Stas with closure of semilunar valves and ends with opening of AV valves (Appearance of dicrotic notch or incisura in pulse wave tracing) V wave 2nd Rapid ventricular filling - AV valve opens y descent 3rd Diastasis - - - -