March 15, 2003 What is Blood Pressure? You are encouraged to go to www.nhlbi.nih.gov/hbp/index.html to view the NHLBI primary site for this information. This article is from that site, with some adaptation. Please recognize the NHLBI for this presentation. Blood pressure is the force of blood against the walls of arteries. Blood pressure is recorded as two numbers - the systolic pressure (as the heart beats) over the diastolic pressure (as the heart relaxes between beats). The measurement is written one above or before the other, with the systolic number on top and the diastolic number on the bottom. For example, a blood pressure measurement of 120/80 mm Hg (millimeters of mercury) is expressed verbally as "120 over 80." Normal blood pressure is less than 130 mm Hg systolic and less than 85 mm Hg diastolic. Optimal blood pressure is less than 120 mm Hg systolic and less than 80 mm Hg diastolic. Categories for Blood Pressure Levels in Adults* (Ages 18 Years and Older)
* For those not taking medicine for high blood pressure and not having a short-term serious illness. These categories are from the National High Blood Pressure Education Program. ** Optimal blood pressure with respect to heart disease risk is below 120/80 mm Hg. However, unusually low readings should be evaluated for clinical significance. When systolic and diastolic blood pressures fall into different categories, the higher category should be used to classify blood pressure level. For example, 160/80 mm Hg would be stage 2 hypertension (high blood pressure). Understanding High Blood Pressure High blood pressure increases your chance (or risk) for getting heart disease and/or kidney disease, and for having a stroke. It is especially dangerous because it often has no warning signs or symptoms. Regardless of race, age, or gender, anyone can develop high blood pressure. It is estimated that one in every four American adults has high blood pressure. Once high blood pressure develops, it usually lasts a lifetime. You can prevent and control high blood pressure by taking action. In this section you will learn more about what high blood pressure is and what it does inside the body. What is High Blood Pressure? Blood pressure is the force of blood against the walls of arteries. Blood pressure rises and falls during the day. When blood pressure stays elevated over time, it is called high blood pressure or hypertension. Blood pressure is typically recorded as two numbers - the systolic pressure (as the heart beats) over the diastolic pressure (as the heart relaxes between beats). A consistent blood pressure reading of 140/90 mm Hg or higher is considered high blood pressure, another term for hypertension. What is systolic blood pressure? Systolic pressure is the force of blood in the arteries as the heart beats. It is shown as the top number in a blood pressure reading. High blood pressure is 140 and higher for systolic pressure. Diastolic pressure does not need to be high for you to have high blood pressure. When that happens, the condition is called "isolated systolic hypertension," or ISH. Is isolated systolic high blood pressure common? Yes. It is the most common form of high blood pressure for older Americans. For most Americans, systolic blood pressure increases with age, while diastolic increases until about age 55 and then declines. About 65 percent of hypertensives over age 60 have ISH. You may have ISH and feel fine. As with other types of high blood pressure, ISH often causes no symptoms. To find out if you have ISH - or any type of high blood pressure - see your doctor and have a blood pressure test. The test is quick and painless. Is isolated systolic high blood pressure dangerous? Any form of high blood pressure is dangerous if not properly treated. Both numbers in a blood pressure test are important, but, for some, the systolic is especially meaningful. That's because, for those persons middle aged and older, systolic pressure gives a better diagnosis of high blood pressure. If left uncontrolled, high systolic pressure can lead to stroke, heart attack, congestive heart failure, kidney damage, blindness, or other conditions. While it cannot be cured once it has developed, ISH can be controlled. Clinical studies have proven that treating a high systolic pressure saves lives, greatly reduces illness, and improves the quality of life. Yet, most Americans do not have their high systolic pressure under control. Does it require special treatment? Treatment options for ISH are the same as for other types of high blood pressure, in which both systolic and diastolic pressures are high. ISH is treated with lifestyle changes and/or medications. The key for any high blood pressure treatment is to bring the condition under proper control. Blood pressure should be controlled to less than 140/90 mm Hg. If yours is not, then ask your doctor why. You may just need a lifestyle or drug change, such as reducing salt in your diet or adding a second medication. What is diastolic blood pressure? Diastolic pressure is the force of blood in the arteries as the heart relaxes between beats. It's shown as the bottom number in a blood pressure reading. The diastolic blood pressure has been and remains, especially for younger people, an important hypertension number. The higher the diastolic blood pressure the greater the risk for heart attacks, strokes and kidney failure. As people become older, the diastolic pressure will begin to decrease and the systolic blood pressure begins to rise and becomes more important. A rise in systolic blood pressure will also increase the chance for heart attacks, strokes, and kidney failure. Your physician will use both the systolic and the diastolic blood pressure to determine your blood pressure category and appropriate prevention and treatment activities. Why Is High Blood Pressure Important? High blood pressure is dangerous because it makes the heart work too hard. It also makes the walls of the arteries hard. High blood pressure increases the risk for heart disease and stroke, the first- and third-leading causes of death for Americans (see below). High blood pressure can also cause other problems, such as heart failure, kidney disease, and blindness. Risk Factors Risk factors are behaviors or conditions that can increase your chances of developing a disease. For instance, high blood pressure is a risk factor for heart disease and stroke. There are other risk factors for heart disease and stroke. Most can be modified, though some cannot. The more risk factors you have, the greater your chances of developing disease. So it is important to take steps to prevent or control these risk factors. Heart disease and stroke risk factors that can be controlled are:
Risk factors beyond your control are:
Effect of High Blood Pressure on Your Body Find out about the effect of high blood pressure on your body. Read below about the brain, eyes, arteries, kidneys, and heart to get a better understanding at what high blood pressure does to these organs.
Stroke: High blood pressure is the most important risk factor for stroke. Very high pressure can cause a break in a weakened blood vessel, which then bleeds in the brain. This can cause a stroke. If a blood clot blocks one of the narrowed arteries, it can also cause a stroke.
Impaired Vision: High blood pressure can eventually cause blood vessels in the eye to burst or bleed. Vision may become blurred or otherwise impaired and can result in blindness.
Arteries: As people get older, arteries throughout the body "harden," especially those in the heart, brain, and kidneys. High blood pressure is associated with these "stiffer" arteries. This, in turn, causes the heart and kidneys to work harder.
Kidney Damage: The kidneys act as filters to rid the body of wastes. Over time, high blood pressure can narrow and thicken the blood vessels of the kidneys. The kidneys filter less fluid, and waste builds up in the blood. The kidneys may fail altogether. When this happens, medical treatment (dialysis) or a kidney transplant may be needed.
Heart Attack: High blood pressure is a major risk factor for heart attack. The arteries bring oxygen-carrying blood to the heart muscle. If the heart cannot get enough oxygen, chest pain, also known as "angina," can occur. If the flow of blood is blocked, a heart attack results. Congestive Heart Failure: High blood pressure is the number one risk factor for congestive heart failure (CHF). CHF is a serious condition in which the heart is unable to pump enough blood to supply the body's needs. What Causes High Blood Pressure? The causes of high blood pressure vary. Causes may include narrowing of the arteries, a greater than normal volume of blood, or the heart beating faster or more forcefully than it should. Any of these conditions will cause increased pressure against the artery walls. High blood pressure might also be caused by another medical problem. Most of the time, the cause is not known. Although high blood pressure usually cannot be cured, in most cases it can be prevented and controlled. Who Can Develop High Blood Pressure? High blood pressure is common. More than 50 million American adults- 1 in 4 - have high blood pressure. It is very common in African Americans, who may get it earlier in life and more often than whites. Many Americans tend to develop high blood pressure as they get older, but this is not a part of healthy aging. About 60% of all Americans age 60 and older have high blood pressure. Others at risk for developing high blood pressure are the overweight, those with a family history of high blood pressure, and those with high-normal blood pressure (130-139/85-89 mm Hg). High blood pressure occurs more often among African Americans than whites. It begins at an earlier age and is usually more severe. Further, African Americans have a higher death rate from stroke and kidney disease than whites. The good news is, treatment can control high blood pressure. In addition, lifestyle changes can prevent and control high blood pressure. These include losing weight if overweight (losing 10 lbs can help), increasing physical activity (walking 30 minutes per day can help), following a healthy eating plan, that emphasizes fruits, vegetables, and low-fat dairy foods, choosing and preparing foods with less salt and sodium, and if you drink alcoholic beverages, drinking in moderation. If lifestyle changes alone are not effective in keeping your blood pressure controlled, there are many blood pressure medications to help you. High Blood Pressure Detection You can find out if you have high blood pressure by having your blood pressure checked regularly. Most doctors will diagnose a person with high blood pressure on the basis of two or more readings, taken on several occasions. A consistent blood pressure reading of 140/90 mm Hg or higher is considered high blood pressure, another term for hypertension. Some people experience high blood pressure only when they visit the doctor's office. This condition is called "white-coat hypertension." If your doctor suspects this, you may be asked to monitor your blood pressure at home or asked to wear a device called an ambulatory blood pressure monitor. This device is usually worn for 24 hours and can take blood pressure every 30 minutes. In this section you will learn more about diagnosing high blood pressure. How do I know if I have high blood pressure? High blood pressure often has no signs or symptoms. The only way to find out if you have high blood pressure is to be tested for it. Using the familiar blood pressure cuff, your doctor, nurse or pharmacist can easily tell if your blood pressure is high. How Is Blood Pressure Tested? Having your blood pressure tested is quick and easy. Blood pressure is measured in millimeters of mercury (mm Hg) and recorded as two numbers systolic pressure "over" diastolic pressure. For example, the doctor or nurse might say "130 over 80" as a blood pressure reading. Both numbers in a blood pressure reading are important. As we grow older, systolic blood pressure is especially important. To test your blood pressure, your doctor will use a familiar device with a long name. It is called a sphygmomanometer (pronounced sfig'-mo-ma-nom-e-ter), and may look something like this: ![]() Some blood pressure testing devices use electronic instruments or digital readouts. In these cases, the blood pressure reading appears on a small screen or is signaled in beeps, and no stethoscope is used. Tips for Having Your Blood Pressure Taken
What device can I use to take my own blood pressure? Tests at home can be done with the familiar blood pressure cuff and a stethoscope, or with an electronic monitor, such as a digital readout monitor. Also, be sure that the person who will use the device reads the instructions before taking blood pressure readings. Your doctor, nurse, or pharmacist can help you check the device and teach you how to use it. You also may ask for their help in choosing the right one for you. Blood pressure devices can be bought at various places, such as discount chain stores and pharmacies. Preventing High Blood Pressure You can take steps to prevent high blood pressure by adopting a healthy lifestyle. These steps include maintaining a healthy weight; being physically active; following a healthy eating plan, that emphasizes fruits, vegetables, and low-fat dairy foods; choosing and preparing foods with less salt and sodium; and, if you drink alcoholic beverages, drinking in moderation. In this section you will learn more about healthy lifestyle habits for preventing and controlling high blood pressure. Healthy Eating Research has shown that following a healthy eating plan can both reduce the risk of developing high blood pressure and lower an already elevated blood pressure. For an overall eating plan, consider the DASH diet. "DASH" stands for "Dietary Approaches to Stop Hypertension," a clinical study that tested the effects of nutrients in food on blood pressure. Study results indicated that elevated blood pressures were reduced by an eating plan that emphasizes fruits, vegetables, and low-fat dairy foods and is low in saturated fat, total fat, and cholesterol. The DASH diet includes whole grains, poultry, fish, and nuts and has reduced amounts of fats, red meats, sweets, and sugared beverages. A second clinical study, called "DASH-Sodium," looked at the effect of a reduced dietary sodium intake on blood pressure as people followed either the DASH diet or a typical American diet. Results showed that reducing dietary sodium lowered blood pressure for both the DASH diet and the typical American diet. The biggest blood pressure-lowering benefits were for those eating the DASH diet at the lowest sodium level (1,500 milligrams per day). The DASH-Sodium study shows the importance of lowering sodium intake whatever your diet. But for a true winning combination, follow the DASH diet and lower your intake of salt and sodium. Facts about the DASH diet Click here for a brochure about the facts of the DASH diet! Healthier Eating with DASH The DASH eating plan shown below is based on 2,000 calories a day. The number of daily servings in a food group may vary from those listed depending on your caloric needs.
Getting Started with DASH It's easy to adopt the DASH eating diet. Here are some ways to get started: Change gradually.
Treat meat as one part of the whole meal, instead of the focus.
Use fruits or lowfat foods as desserts and snacks.
How to Lower Calories on the DASH Eating Plan The DASH eating plan was not designed to promote weight loss. But it is rich in lower calorie foods, such as fruits and vegetables. You can make it lower in calories by replacing higher-calorie foods with more fruits and vegetables--and that also will make it easier for you to reach your DASH diet goals. Here are some examples: To increase fruits
To increase vegetables
To increase lowfat or fat free dairy products
And don't forget these calorie-saving tips:
Heart Healthy Recipes By making a few changes in your eating habits, you can help lower your high blood pressure. Follow these links to some great recipes that show you how eating less fat, cholesterol, salt, and sodium can make a difference and taste great too. Tips On How To Make Healthier Meals Begin by choosing foods low in saturated fat, low in sodium and low in calories:
Use these recipe substitutions:
Try these meal tips:
A Word About Fats Fats - especially saturated fat - affect the health of your heart and blood vessels. There are various types of fat. Saturated fat is often found in foods from animals. This includes fatty meats, the skin of poultry, and whole-milk dairy products, such as butter, cheese, cream, and ice cream. It also is in coconut, palm kernel, and palm oils. These oils are found mostly in processed foods, such as baked goods, snack foods, and crackers. If you use saturated fat, keep the amount small. Instead of saturated fat, try soft or liquid margarine and such oils as canola, safflower, and olive. However, all kinds of fats have the same amount of calories and need to be limited to help you lose weight. Reduce Salt and Sodium in Your Diet A key to healthy eating is choosing foods lower in salt and sodium. Most Americans consume more salt than they need. The current recommendation is to consume less than 2.4 grams (2,400 milligrams[mg] ) of sodium a day. That equals 6 grams (about 1 teaspoon) of table salt a day. The 6 grams include ALL salt and sodium consumed, including that used in cooking and at the table. For someone with high blood pressure, the doctor may advise eating less salt and sodium, as recent research has shown that people consuming diets of 1,500 mg of sodium had even better blood pressure lowering benefits. These lower-sodium diets also can keep blood pressure from rising and help blood pressure medicines work better. Click here for much more on reducing salt and sodium in your diet Maintaining a Healthy Weight Being overweight increases your risk of developing high blood pressure. In fact, blood pressure rises as body weight increases. Losing even 10 pounds can lower blood pressure - and it has the greatest effect for those who are overweight and already have hypertension. Being overweight is also a risk factor for heart disease. It increases your chance for developing high blood cholesterol and diabetes - two more major risk factors for heart disease. Click here for much more on maintaining a healthy weight Physical Activity Being physically active is one of the most important steps you can take to prevent or control high blood pressure. It also helps reduce your risk of heart disease. It doesn't take a lot of effort to become physically active. Click here for much more on physical activity Limit Alcohol Intake Drinking too much alcohol can raise blood pressure. It also can harm the liver, brain, and heart. Alcoholic drinks also contain calories, which matter if you are trying to lose weight. If you drink alcoholic beverages, have only a moderate amount - one drink a day for women; two drinks a day for men. What counts as a drink?
Check out this quiz on drinking alcohol Quitting Smoking Smoking injures blood vessel walls and speeds up the process of hardening of the arteries. This applies even to filtered cigarettes. So even though it does not cause high blood pressure, smoking is bad for anyone, especially those with high blood pressure. If you smoke, quit. If you don't smoke, don't start. Once you quit, your risk of having a heart attack is reduced after the first year. So you have a lot to gain by quitting. Click here for more information about quitting smoking Other Factors Affecting Blood Pressure Check out this information about other factors effecting blood pressure. Click here for more information Treatment of High Blood Pressure It is important to take steps to keep your blood pressure under control. The treatment goal is blood pressure below 140/90 and lower for people with other conditions, such as diabetes and kidney disease. Adopting healthy lifestyle habits is an effective first step in both preventing and controlling high blood pressure. If lifestyle changes alone are not effective in keeping your pressure controlled, it may be necessary to add blood pressure medications. In this section you will learn about blood pressure-lowering lifestyle habits and blood pressure medications. Please note the preventive measures as presented on pages 7 through 12. You can also access this information through these Lifestyle links. Medications Used to Treat High Blood Pressure
Diuretics
Beta blockers
ACE inhibitors
Angiotensin antagonists
Calcium channel blockers (CCBs)
Alpha blockers According to results from an NHLBI clinical study, an alpha blocker may not be the best choice for initial treatment for uncomplicated high blood pressure.
Alpha-beta blockers
Nervous system inhibitors
Vasodilators Make sure to see our article An Overview of Medications for Hypertension Tips to Help You Remember to Take Your Medicine
Questions To Ask Your Doctor If You Have High Blood Pressure:
Check out the medication IQ quiz Issues For Women Three out of four women with high blood pressure know they have it. Yet fewer than one in three are controlling their blood pressure. All women should take steps to control their blood pressure. Learn more about conditions that can increase blood pressure in women. Click here for important information for women Real Life Examples related to High Blood Pressure With these links, you will meet Mary Ellen, Ron, Hal, Maria, and Carol. These 5 people have high blood pressure and are making changes to control it. Find out about lifestyle choices they are making to improve their heart health and see how they control their high blood pressure. Click on a name listed below to learn more about that person. Click here to read about Mary Ellen and high blood pressure Click here to read about Ron and high blood pressure Click here to read about Hal and high blood pressure | |||||||||||||||||||||||||||||||||||||||||||||||
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