High blood pressure (hypertension)

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  • With Mayo Clinic emeritus hypertension specialist

    Sheldon G. Sheps, M.D.

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Question

Isolated systolic hypertension: A health concern?

My doctor says my diastolic pressure is fine but my systolic pressure is too high. I thought diastolic pressure was the more important number?

Answer

from Sheldon G. Sheps, M.D.

If you have a diastolic number less than 90 millimeters of mercury (mm Hg) and a systolic number greater than 140 mm Hg, you have a common type of high blood pressure called isolated systolic hypertension. Isolated systolic hypertension can be caused by other underlying conditions, such as a leaky heart valve, or an overactive thyroid (hyperthyroidism).

For years, doctors focused primarily on diastolic blood pressure — which is the bottom number in a blood pressure reading. The theory was that the body could tolerate occasional increases in systolic blood pressure, but consistently high diastolic pressure could lead to health problems. However, doctors now know that high systolic pressure is as important as high diastolic pressure — and even more important in people older than age 50.

The recommended goal for systolic pressure is less than 140 mm Hg. However, a concern in people with isolated systolic hypertension is that treatment may lower diastolic pressure too much, increasing the risk of a heart attack or stroke. So, if you have isolated systolic hypertension, your doctor may recommend that your diastolic pressure shouldn't be reduced to less than 70 mm Hg in trying to reach your target systolic pressure.

Isolated systolic hypertension can lead to serious health problems, such as:

  • Stroke
  • Heart disease
  • Chronic kidney disease
  • Dementia
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References
  1. Kaplan NM, et al. Treatment of hypertension in the elderly, particularly isolated systolic hypertension. http://www.uptodate.com/home/index.html. Accessed May 12, 2008.
  2. Stokes GS. Treatment of isolated systolic hypertension. Current Hypertension Reports. 2006;8:377.
  3. Sheps SG, ed. Mayo Clinic 5 Steps to Controlling High Blood Pressure. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2008.

AN01113

July 11, 2009

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