Hemodynamics

• The backwards flow of blood across the Aortic valve is the direct cause of the early diastolic murmur.
• The increased compensatory bloodflow to uphold normal cardiac output will often cause a midsystolic murmur. 
• Due to the backflow from aorta, the opening of the mitral valve may be restricted during left atrial outflow, creating a mid to late systolic murmur known as the Austin Flint murmur.
• Left ventricular pressure is remained normal.
• Atrial diastolic pressure is lowered.