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Answers from Sheldon G. Sheps, M.D. Yes. If you have a diastolic number â the bottom number of a blood pressure measurement â less than 90 millimeters of mercury (mm Hg) and a systolic number â the top number of a blood pressure measurement â greater than 140 mm Hg, you have a common type of high blood pressure called isolated systolic hypertension.
HealthDay Reporter. THURSDAY, May 29, 2014 (HealthDay News) -- When you have high blood pressure, exactly what type of increased heart risk you face may be determined by which number in your blood pressure reading is high, new research shows. In a blood pressure reading, systolic pressure is the top number and diastolic pressure is the bottom number.