Pulse upstroke and pulse amplitude?

what is the difference between pulse upstroke and pulse amplitude? i didn’t get the mitral regurgitation example given in pulse

Upstrike is the wave amplitude is the feel

sir p wave of pulse is caused by lv ejection , if the ejection of blood is low as seen in mr won’t the p wave and amplitude both be reduced ?

sir in the video you said upstroke is highly increased but pulse amplitude is decreased in mr. what is the difference between pulse upstroke and pulse amplitude ?