- Repolarization of the ventricles is now complete (end of the T wave).
- The aortic valve closes, followed by closure of the pulmonic valve. Closure of the semilunar valves corresponds to the second heart sound. Inspiration causes splitting of the second heart sound.
- The AV valves remain closed during most of this phase.
- Ventricular pressure decreases rapidly because the ventricle is now relaxed.
- Ventricular volume is constant (isovolumetric) because all of the valves are closed.
- The "blip" in the aortic pressure tracing occurs after closure of the aortic valve and is called the dicrotic notch, or incisura.
-When ventricular pressure becomes less than atrial pressure, the mitral valve opens.
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