Jazlynn Tan (11)

Blood pressure

What is high blood pressure?causes heart to work harder than normal heart and arteries at greater risk of damage. increases the risk of heart diseasesexists where the pressure at which blood is

pushing against blood vessel walls is consistently above average.

Blood pressure changes throughout the day.increases during exercisedecreases during sleep.If left untreated can cause heart to become

abnormally large and less efficient (ventricular hypertrophy) causing heart failure

Symptoms of high blood pressurecan cause headaches, dizziness and

problems with vision,

majority of people suffer no symptoms at

all.

Therefore, many people with hypertension

remain undiagnosed because they have no

symptoms to go for a check-up

Causes of high blood pressureIf untreated and combined with obesity,

smoking, high blood cholesterol levels, risk of heart attack is several times higher.

Arteries also suffer the effects of high blood pressure, becoming scarred, hardened and less elastic.

hardening of arteries occurs with agehigh blood pressure accelerates the process. unable to supply an adequate amount of blood,

organs cannot work effectively.a blood clot may lodge in an artery which is

already narrowed blocking blood supply.

measurementThe doctor measures the maximum pressure

(systolic) and the lowest pressure (diastolic)The systolic pressure is the maximum

pressure in an artery at the moment when the heart is beating and pumping blood through the body.

The diastolic pressure is the lowest pressure in an artery in the moments between beats when the heart is resting.

Both measurements are important – if either one is raised, it means you have high blood pressure.

PacemakersA pacemaker is a small device that's placed

in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.

Used to treat problems dealing with the rate and rhythm of the heart

TypesSingle-chamber pacemakers

carry electrical pulses from the generator to the right ventricle of the heart.

Dual-chamber pacemakerscarry electrical pulses from the generator to

both the right ventricle and right atrium of the heart.

coordinate the timing of the right ventricle and right atrium contractions.

Biventricular pacemakersHas an additional device which delivers

electrical pulses from the generator to the right atrium, right ventricle and left ventricle

Videohttp://video.about.com/

highbloodpressure/Blood-Pressure.htm

Referenceshttp://www.bbc.co.uk/health/physical_health/c

onditions/in_depth/heart/hypertension1.shtmlhttp://health.howstuffworks.com/medicine/mo

dern-technology/how-does-a-pacemaker-work.htm

http://science.howstuffworks.com/environmental/life/human-biology/blood.htm

http://emedtravel.wordpress.com/2012/04/03/understanding-pacemakers-part-2-of-5/

http://hoardingwoes.wordpress.com/2012/02/04/pacemakers-sustained-life-during-hospice/

http://www.cdc.gov/bloodpressure/about.htm

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