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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 bottom number (diastolic) is the pressure when your heart is resting (between beats). It's a measure of how flexible / hardened your arteries are. The bottom number of a blood is called the diastolic pressure. while the top number is called the systolic pressure. The systolic pressure is always the top number and the diastolic pressure is always the bottom number.