Your Health - High Blood Pressure

High Blood Pressure

(Blood Pressure, High; Essential Hypertension; Idiopathic Hypertension; Primary Hypertension)

Animation Movie Available Controlling Your High Blood Pressure

Definition

High blood pressure is abnormally high blood pressure with no known cause. Blood pressure measurements are read as two numbers:

Systolic pressure: higher number, normal reading is 120 millimeters of mercury (mmHg) or less
Diastolic pressure: lower number, normal reading is 80 mmHg or less

High blood pressure is defined as systolic pressure greater than 140 mmHg and/or diastolic pressure greater than 90 mmHg. You are considered prehypertensive if your systolic blood pressure is between 120-139 mmHg, or your diastolic pressure is between 80- 89 mmHg. Your doctor will recommend monitoring and lifestyle changes.

High blood pressure puts stress on the heart, lungs, brain, kidneys, and blood vessels. Over time, this condition can damage these organs and tissues.

Organs Impacted by High Blood Pressure

Causes

The cause of essential hypertension is not known.

Risk Factors

These factors increase your chance of developing high blood pressure. Tell your doctor if you have any of these risk factors:

Sex:
- Male
- Postmenopausal female
Race: Black
Age: middle-aged and older
Overweight
Heavy drinking of alcohol
Smoking
Use of oral contraceptives (birth control pills)
Sedentary lifestyle
Family history
Kidney disease
Diabetes
High-fat, high-salt diet
Stress

Symptoms

High blood pressure usually does not cause symptoms. But, the condition can still damage your organs and tissues.

Occasionally, if blood pressure reaches extreme levels, you may have the following:

Headache
Blurry or double vision
Abdominal pain
Chest pain
Shortness of breath
Dizziness

Diagnosis

High blood pressure is often diagnosed during a doctor's visit. Blood pressure is measured using an arm cuff and a special device. If your reading is high, you'll come back for repeat checks. If you have two or more visits with readings over 140/90 mmHG, you will be diagnosed with high blood pressure.

Your doctor will order tests to make sure your high blood pressure is not caused by another condition. You will also be tested to see if the high blood pressure has cause any problems.

Tests include:

Blood tests
Urine tests
Chest x-rays —a test that uses radiation to take a picture of structures inside the body
Electrocardiogram (ECG, EKG) —a test that records the heart's activity by measuring electrical currents through the heart muscle

Treatment

Lifestyle Changes

Maintain a healthy weight .
Begin a safe exercise program with the advice of your doctor.
If you smoke, quit .
Eat a healthful diet , one that is low-fat, low-salt, and rich in fiber , fruits, and vegetables. Your doctor may recommend the DASH diet , which is designed to reduce blood pressure.
Drink alcohol in moderation (no more than two drinks per day for men, one drink per day for women).
Manage stress .

Medications

These include:

Diuretics
Beta blockers
Angiotensin converting enzyme inhibitors (ACE inhibitors)
Calcium channel blockers
Angiotensin receptor blockers
Aldosterone blockers
Alpha blockers
Alpha-beta blockers
Nervous system inhibitors
Vasodilators

Note: Untreated high blood pressure can lead to:

If you are diagnosed with high blood pressure, follow your doctor's instructions .

Prevention

To help reduce your risk of getting high blood pressure, take the following steps:

Eat a well-balanced diet. The DASH diet —rich in fruits, vegetables and low-fat dairy foods, and low in saturated fat, total fat, and cholesterol—may help keep your blood pressure in the healthy range.
Exercise regularly.
Maintain a healthy weight. (Your body mass index should be below 25.)
If you smoke, quit .
Drink alcohol in moderation. Moderate is two or fewer drinks per day for men and one or fewer drinks per day for women and older adults.

RESOURCES:

American Heart Association
http://www.americanheart.org/

National Heart, Lung, and Blood Institute
http://www.nhlbi.nih.gov/

CANADIAN RESOURCES

Canadian Cardiovascular Society
http://www.ccs.ca/home/index_e.aspx/

Heart and Stroke Foundation of Canada
http://ww2.heartandstroke.ca/Page.asp?PageID=24/

References:

Chobanian AV. Clinical practice. Isolated systolic hypertension in the elderly. N Engl J Med. 2007;357:789-796.

Chobanian AV, Bakris GL, Black HR, et al. The seventh report of the Joint National Committee on prevention, detection, evaluation, and treatment of high blood pressure. The JNC 7 report. JAMA . 2003;289:2560-2572.

Conn HF, Rakel RE. Conn's Current Therapy 2001 . 53rd ed. Philadelphia, PA: WB Saunders Company; 2001.

High blood pressure. American Heart Association website. Available at: http://www.americanheart.org/hearthub/hc-high-blood-pressure.htm . Accessed July 6, 2008.

Hypertension. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php . Updated July 2008. Accessed July 6, 2008.

Schroeder K. The DASH diet. EBSCO Health Library website. Available at: http://www.ebscohost.com/thisTopic.php?marketID=15topicID=81 . Updated May 2008. Accessed July 6, 2008.

Smith N. How to measure blood pressure (in a clinical setting). EBSCO PERC website. Available at: http://www.ebscohost.com/thisTopic.php?marketID=15topicID=81 . Updated October 2007. Accessed July 6, 2008.

Smoots E. Do you have prehypertension? EBSCO Health Library website. Available at: http://www.ebscohost.com/thisTopic.php?marketID=15topicID=81 . Updated March 2008. Accessed July 6, 2008.

What is high blood pressure? National Heart, Lung, and Blood Institute website. Available at: http://www.nhlbi.nih.gov/health/dci/Diseases/Hbp/HBP_WhatIs.html . Updated April 2008. Accessed July 6, 2008.

¹9/2/2009 DynaMed Systematic Literature Surveillance DynaMed's Systematic Literature Surveillance : Forman J, Stampfer M, Curhan G. Diet and lifestyle risk factors associated with incident hypertension in women. JAMA. 2009;302(4):401-411.

Last reviewed September 2009 by David N. Smith, MD

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.