Which part of diastole is represented by the D - E - F portion of the Mitral Valve?

The D - E - F portion of the Mitral Valve during diastole represents the rapid filling phase of the heart. This phase occurs shortly after the mitral valve opens, allowing blood to flow quickly from the left atrium into the left ventricle.

During rapid filling, the pressure in the left atrium is higher than that in the left ventricle, causing blood to rush through the open mitral valve. This is characterized by a swift increase in ventricular volume and is typically visualized on Doppler ultrasound as a steep, high-velocity waveform. Understanding this phase is critical for assessing diastolic function and can indicate how well the left ventricle is filling with blood.

In contrast, passive filling occurs before the mitral valve opens, Atrial contraction occurs later in diastole, specifically at the end of the filling phase, and isovolumetric relaxation is the phase where pressure within the ventricles falls but all valves are closed, preventing any change in volume. Each of these phases plays a distinct role in the cardiac cycle, underscoring the importance of recognizing the rapid filling phase represented by the D - E - F portion of the mitral valve in the context of diastolic function.