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The bottom number is the more important of the two. The bottom number of your BP (104) is a bit high. That's the pressure in your blood vessels after your heart has contracted and is now at momentary rest. Average is about 80. Your upper number (128) corresponds to the pressure in your vessels when your heart contracts.
Best Answer: the top number is your systolic pressure. Normal is 120. Anything over 135-140 is high and should be treated. The systolic pressure is the moment after your left ventricle pumps out the blood and is the highest pressure in the heart cycle.eport Abuse. The top number of your BP is called systolic and is the pressure when the heart is pumping, measured in mm of mercury. The bottom number is called diastolic and is the pressure maintained when the heart is resting, between beats as it were.