When the heart pumps blood into the arteries, the blood flows with a force pushing against the walls of the arteries. This force is called the blood pressure. When your blood pressure is measured, it is a measure of how hard the heart has to work to pump the blood.
When the arteries become hardened and narrowed with cholesterol plaque (atherosclerosis) and calcium (arteriosclerosis), the heart has to strain much harder to pump blood through them. This makes the blood pressure go abnormally high. High blood pressure is also called hypertension.
What makes high blood pressure important is that it usually causes no symptoms but can still cause serious complications.
Many people have high blood pressure and don't even know it.
The key complications of high blood pressure include heart disease, heart attack, congestive heart failure, stroke, kidney failure, and peripheral artery disease, especially aortic aneurysms or outpouchings of the aorta.
Public awareness of these dangers has increased. High blood pressure has become the second most common reason for medical visits in the United States.
Blood pressure is measured with a blood pressure cuff and recorded as 2 numbers, such as 120/80 mm Hg (millimeters of mercury).
The top, larger number is called the systolic pressure. This is the pressure generated when the heart contracts (pumps). It reflects the pressure of the blood against arterial walls.
The bottom, smaller number is called the diastolic pressure. This reflects the pressure in the arteries while the heart is filling and resting between heartbeats.
Scientists have determined a normal range for both systolic and diastolic blood pressure after examining the blood pressure of many people.
Those whose blood pressure is consistently higher than this norm are said to have high blood pressure or hypertension.
High blood pressure in adults is defined as a consistently elevated blood pressure of 140 mm Hg systolic and 90 mm Hg diastolic or higher.
As many as 60 million Americans have high blood pressure.
That's about 1 in 4 adults aged 18 years and older.
Uncontrolled high blood pressure is indirectly responsible for many deaths and disability resulting from heart attack, stroke, and kidney failure.
According to research studies, the risk of dying of a heart attack is directly linked to blood pressure, especially systolic hypertension. The higher your blood pressure, the higher your risk.
However, the progress of heart disease caused by high blood pressure can be slowed down.
Circulatory System
Circulatory System, or cardiovascular system, in humans, the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products. Among its vital functions, the circulatory system increases the flow of blood to meet increased energy demands during exercise and regulates body temperature.
