We also felt movement at the mid-to-lower left sternal edge, a more usual area to feel precordial movement at the parasternal edge. Now, we are going to time that movement against the pulmonary artery movement. We can do that because we already know that the pulmonary artery movement is in early systole. Let's observe together timing the lower left sternal edge movement against the pulmonary artery movement. [Cut-away]