Question

What are the four phases of diastole?

Answer 1

Stages of Diastole:

1. The diastole is necessary for the left ventricle to fill with enough blood at a low enough pressure. The diastolic function is the name for this process.
2. The four stages of diastole are as follows:
   1. Stage 1: - Isovolumic Relaxation: The aortic valve closes before the mitral valve opens in this stage. Without a change in volume, the pressure in the left ventricle (LV) drops rapidly to below the pressure in the left auricle (LAP). The Mitral Valve (MV) can open when the pressure falls below LA.
   2. Stage 2: - Rapid Filling: Once the MV opens, blood is suctioned from the LA towards the apex of the LV.
   3. Stage 3: - Diastasis: After the initial filling of blood, the pressures in both the LV and LA equalise, limiting blood flow into the LV.
   4. Stage 4: - Atrial Contraction: The final stage of diastole results in a second rapid pressure gradient between chambers, which pulls more blood into the LV.