lesson 47 reducing the risk of cardiovascular the risk of cardiovascular diseases michael...

Download Lesson 47 Reducing the Risk of Cardiovascular   the Risk of Cardiovascular Diseases Michael Keller/CORBIS • I will choose behaviors to reduce my risk of cardiovascular diseases. A disease of the heart

Post on 28-Mar-2018

213 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Reducing the Risk ofCardiovascularDiseases

    Michael Keller/CORBIS

    I will choose behaviors to reduce my risk ofcardiovascular diseases.

    Adisease of the heart and blood vessels is a .In this lesson you will learn about the risk factors you can and cannot control. cardiovascular diseaseWhat Youll Learn1. Identify characteristics of

    different cardiovasculardiseases. (p. 515)

    2. Identify cardiovascular diseaserisk factors that cannot becontrolled. (p. 518)

    3. Identify cardiovascular riskfactors that can be controlled.(p. 518)

    4. Describe medical diagnosesand treatments for heartdisease. (p. 520)

    Why Its ImportantHeart disease, a type ofcardiovascular disease, is theleading cause of death in theUnited States. You can take stepsto reduce your risk of developingheart disease. This lesson willdescribe what you can do to keepyour heart healthy.

    Key Terms cardiovascular disease angina pectoris plaque arteriosclerosis arrhythmia pacemaker stroke aneurysm prehypertension antihypertensives

    Writing About Reducing Risk Suppose that since several membersof your family suffer from cardiovascular diseases, you know that youhave a higher risk of developing a cardiovascular disease. What can youdo to lower your risk? After reading about reducing your risk on page518, make a list in your health journal of ways you can reduce your riskof developing cardiovascular disease.

    514 UNIT 8 Communicable and Chronic Diseases

    47

  • There are many different kinds of cardiovascular diseases.

    They have signs and symptoms that are unique to each.

    In this section you will learn about the characteristics of

    eight different kinds of cardiovascular diseases.

    Angina pectoris Chest pain thatresults from narrowed coronaryarteries is (an JYnuhPEK tuh ruhs). The pain occursbecause the heart is not getting anadequate amount of oxygen. Suddenphysical exertion, vigorous exercise,or excessive stress can cause anginapectoris in people with coronary heartdisease. Many people with coronaryheart disease take nitroglycerin pillsto relieve chest pains. Nitroglycerinis a drug that widens the coronaryarteries, allowing more oxygen to getto the cardiac muscle. A heart attackmay occur if the narrowing thatcauses angina pectoris is very severe.

    Congestive heart failure A conditionthat occurs when the hearts pumpingability is below normal capacity andfluid accumulates in the lungs andother areas of the body is congestiveheart failure. Causes of congestiveheart failure are heart attack, athero-sclerosis, birth defects, high bloodpressure, and rheumatic fever. Drugsthat improve the hearts pumpingability and get rid of excess fluids areused to treat congestive heart failure.Reducing the amount of sodium inthe diet is helpful.

    Coronary heart disease A disease inwhich the coronary arteries are nar-rowed or blocked is coronary heartdisease (CHD). A coronary arteryis a blood vessel that carries blood tothe heart muscles. The coronaryarteries encircle the heart and con-tinuously nourish it with blood.Plaque buildup in the coronary arter-ies causes coronary heart disease,which can cause a heart attack.

    is hardened deposits of fatand other materials in the walls ofarteries throughout the body.

    Plaque

    angina pectoris

    LESSON 47 Reducing the Risk of Cardiovascular Diseases 515

    What to Know AboutCardiovascular Diseases

    Fish Oils Omega-3fatty acids, found infish oils, are good forthe heart. Studies are underway todetermine their effect on the health of the brain.

    This artery contains plaque buildup.

  • Arteriosclerosis and atherosclerosisA term used to describe hardeningand thickening of the arteries is

    (ahr tee ree ohskluh ROH sis). Arteriosclerosistends to occur naturally as peopleage. Atherosclerosis is a disease inwhich fat deposits collect on arterywalls. The fatty deposits may hardenand form plaque. Medical scientistsbelieve that high blood cholesterollevels, a high-fat diet, high bloodpressure, and smoking can causeinjury to the lining of arteries andcontribute to plaque buildup. Thebuildup of plaque in artery walls doesnot develop suddenly later in life, butmay begin as early as age two. Botharteriosclerosis and atherosclerosisare types of coronary heart disease.

    Heart rhythm abnormalities Theheart must beat in rhythm to effec-tively pump blood throughout thebody. A heart condition in which theheart may beat very slowly or veryfast for no obvious reason is

    (ay RIHTH mee uh).The heart may skip beats or beatirregularly. Various drugs are avail-able to treat arrhythmia. People whodo not improve after taking drugs mayneed to have surgery to implant apacemaker. A is a devicethat is implanted in the heart to stim-ulate normal heart contractions.

    Rheumatic fever An autoimmuneaction in the heart that can causefever, weakness, and damage to thevalves in the heart is

    The symptoms of rheumaticfever are painful, swollen joints, andskin rashes. Rheumatic fever is mostcommon in children and teens.Prevention of rheumatic feverinvolves getting prompt treatment forstrep throat. Permanent heart dam-age that results from rheumatic feveris called rheumatic heart disease.

    Stroke A condition caused by ablocked or broken blood vessel in thebrain is a or cerebrovascu-lar (suh ree broh VAS kyuh luhr)accident. Brain cells in the area ofthe blocked or broken blood vesselare deprived of the oxygen they need.The brain cells die within minutesand the affected area of the brain andthe parts of the body controlled bythose brain cells cannot function.One of the most common causes of astroke is a blood clot in an artery inthe brain. Strokes also can be causedif an aneurysm in the brain bursts.An (AN yuh rih zuhm) isa weakened area of a blood vessel.

    aneurysm

    stroke,

    fever.rheumatic

    pacemaker

    arrhythmia

    arteriosclerosis

    516 UNIT 8 Communicable and Chronic Diseases(t)ISM/Phototake, (b)Michael Keller/CORBIS

    Stroke Stroke is thethird leading causeof death in the

    United States.

    A pacemaker isused to treat

    arrhythmia.

    A physician candetermine if a

    persons heartbeatis normal.

  • Strokes also can be caused by a headinjury. A stroke may result in paraly-sis, disability, or death. High bloodpressure, cigarette smoking, highblood cholesterol, and having heartdisease or diabetes are major riskfactors for having a stroke.

    Heart attack The death of cardiacmuscle caused by a lack of blood flowto the heart is a heart attack. Themedical term for heart attack ismyocardial infarction (my uh KAR dee uhlin FARK shun) (MI). A coro-nary artery that is narrowed byplaque might become clogged by ablood clot, preventing blood flow to the heart muscle. A heart attack mayresult in disability or death. The

    warning signs includeuncomfortable pressureor pain in the center ofthe chest that lasts formore than a few minutes;pain that spreads to theshoulders, neck, jaw, back,or stomach; lightheadedness;fainting; sweating; nausea; and short-ness of breath.

    Most heart attacks start with mildpain or discomfort and progress slowly.Others are sudden and intense. TheAmerican Heart Association (AHA)warns that not all of these signs occurin every heart attack. The AHAadvises that a person should get med-ical help immediately when some ofthese symptoms occur.

    LESSON 47 Reducing the Risk of Cardiovascular Diseases 517Tim Fuller

    One of the best things you can do to keep your heart healthy is to keep moving. Regular moderate to vigorousexercise strengthens your heart. It also helps control blood cholesterol and blood pressure and reduces stress.Remember that exercise that is good for your heart is aerobic. It makes your muscles useoxygen and causes your heart to pump harder to deliver oxygen to the muscles.Recognize that aerobic exercise is vigorous, repetitive, and sustainedlasting 20 minutes or more at a time. Here aresome tips to help you fit more heart-healthy exercise intoyour weekly routine.

    Using Goal-Setting and Decision-Making Skills: Being Heart Healthy

    Keep a daily log of youraerobic activities.

    1 Write yourhealth goal.For one week,keep a daily chart ofyour aerobic activitiesand the number ofminutes spent on eachone. Try to include avariety of aerobicexercises.

    2Make an action

    plan to

    meet your health goal.

    Review your chart. Rate

    your level of aerobic activity

    as low, medium, or high. A

    high level is three or more

    sessions per week of mod-

    erate to vigorous exertion

    lasting 20 minutes or

    more at a time.

    5Build a supp

    ort

    system. Have fun

    while exercising.

    Choose activities that you

    will enjoy. This will make

    it easier for exercise to

    become a habit.

    3 Identifyobstacles toyour plan. Ifyour rating is low ormedium, set one ormore goals forincreasing your level ofaerobic activity. Forexample, if you spend anhour or more each dayplaying video games, youcould replace 20 minutesof that time with anaerobic activity.

    4Set up

    a timeline to a

    ccomplish

    your health go

    al and keep a

    chart or diary

    in which you

    record progres

    s towards your

    health

    goal. As you se

    t your goals, co

    nsider

    your schedule. D

    o you prefer to

    be active

    in the morning o

    r evening? How

    can you

    make more time

    for exercise? Th

    ink

    about location. W

    ill you exercise

    at home,

    at school, or som

    ewhere else? Do

    you

    prefer exercisin

    g alone or with

    others?

    6 Revise your action plan or timelineif necessary and reward yourselfwhen you reach your health goal.Lastly, be realistic. If you havent exercisedmuch, start with