Home | High Blood Pressure | Low Blood | Pulmonary Embolism | Deep Vein Thrombosis | Thalassemia |
HIGH BLOOD PRESSURE OR HYPERTENSION
High blood pressure (hbp) or hypertension means high pressure (tension) in the arteries. Arteries are vessels that carry blood from the pumping heart to all the tissues and organs of the body. High blood pressure does not mean excessive emotional tension, although emotional tension and stress can temporarily increase blood pressure. Normal blood pressure is below 120/80; blood pressure between 120/80 and 139/89 is called "pre-hypertension", and a blood pressure of 140/90 or above is considered high.
The top number, the systolic blood pressure, corresponds to the pressure in the arteries as the heart contracts and pumps blood forward into the arteries. The bottom number, the diastolic pressure, represents the pressure in the arteries as the heart relaxes after the contraction. The diastolic pressure reflects the lowest pressure to which the arteries are exposed.
An elevation of the systolic and/or diastolic blood pressure increases the risk of developing heart (cardiac) disease, kidney (renal) disease, hardening of the arteries (atherosclerosis or arteriosclerosis), eye damage, and stroke (brain damage). These complications of hypertension are often referred to as end-organ damage because damage to these organs is the end result of chronic (long duration) high blood pressure. For that reason, the diagnosis of high blood pressure is important so efforts can be made to normalize blood pressure and prevent complications.
It was previously thought that rises in diastolic blood pressure were a more important risk factor than systolic elevations, but it is now known that in people 50 years or older systolic hypertension represents a greater risk.
Affecting approximately one in four adults in the United States, hypertension is clearly a major public health problem.
What Are the Signs and Symptoms of High Blood Pressure?
High blood pressure (HBP) itself usually has no symptoms. Rarely, headaches may occur.
You can have HBP for years without knowing it. During this time, HBP can damage the heart, blood vessels, kidneys, and other parts of the body.
Some people only learn that they have HBP after the damage has caused problems, such as coronary heart disease, stroke, or kidney failure.
Knowing your blood pressure numbers is important, even when you’re feeling fine. If your blood pressure is normal, you can work with your health care team to keep it that way. If your numbers are too high, you can take steps to lower them and control your blood pressure. This helps reduce your risk for complications.
Complications of High Blood Pressure
When blood pressure stays high over time, it can damage the body. HBP can cause:
- The heart to get larger or weaker, which may lead to heart failure. Heart failure is a condition in which the heart can’t pump enough blood throughout the body.
- Aneurysms (AN-u-risms) to form in blood vessels. An aneurysm is an abnormal bulge or “ballooning” in the wall of an artery. Common spots for aneurysms are the main artery that carries blood from the heart to the body; the arteries in the brain, legs, and intestines; and the artery leading to the spleen.
- Blood vessels in the kidney to narrow. This may cause kidney failure.
- Arteries throughout the body to narrow in some places, which limits blood flow (especially to the heart, brain, kidneys, and legs). This can cause a heart attack, stroke, kidney failure, or amputation of part of the leg.
- Blood vessels in the eyes to burst or bleed. This may lead to vision changes or blindness.
Measuring Blood Pressure
Doctors typically measure blood pressure with a sphygmomanometer, which has a cuff that's wrapped around the upper arm and pumped up to create pressure. When the cuff is inflated, it compresses a large artery in the arm, stopping the blood flow for a moment. Blood pressure is measured as air is gradually let out of the cuff, which allows blood to flow through the artery again.
The doctor or nurse will also put a stethoscope over an artery to hear the first pulse as the blood flows through - this is the systolic pressure (or the pressure at the peak of each heartbeat). The diastolic pressure (the pressure when the heart is resting between beats) is noted when the sounds disappear. When a blood pressure reading is taken, the higher number represents the systolic pressure and the lower number represents the diastolic pressure. For example: 120/80 (120 over 80) means that the systolic pressure is 120 and the diastolic pressure is 80.
As kids grow, their blood pressure increases from a systolic pressure of about 70-90 in an infant to adult values in a teenager. Among young kids, the "normal" range will depend on the child's gender, age, and height; your child's doctor will be able to compare your child's blood pressure with national norms.
In children, high blood pressure is defined as a blood pressure greater than the 95th percentile for their age, height, and gender (in other words, 95% of kids of the same age, height, and gender will have blood pressure below this number).
It's not unusual for a first blood pressure reading to be high because the child is nervous, so the doctor will likely take three readings - and use an average of the three to determine whether your child has high blood pressure or is at risk for developing the condition.