DokterSehat.Com - Blood pressure is the force exerted by the blood that suppress blood vessel wall. Blood pressure is one important sign of life or vital signs also include heart rate, respiratory rate, and body temperature. Blood pressure arising from the movement of the heart pumps blood into the arteries that followed the response of blood vessels in an attempt to regulate blood flow.
A person's blood pressure is expressed in systolic blood pressure / diastolic, such as 120/80. Systolic blood pressure illustrates the arterial pressure when the heart muscle contracts and pumps blood into the arteries. Diastolic blood pressure represents the pressure of blood in the arteries when the heart muscle relaxation (rest) after contracting. Systolic blood pressure is always higher than the diastolic blood pressure.
The range of systolic blood pressure in healthy adults is between 90-120 mmHg. Normal diastolic blood pressure ranged between 60-80 mmHg. The current guidelines define normal blood pressure is 120/80 or lower. Blood pressure above 130/80 is considered high. High blood pressure increases the risk of damage to the arteries which leads to heart disease, kidney, hardening of the arteries (atherosclerosis or arteriosclerosis), eye disease, and stroke.
Low blood pressure (hypotension) is blood pressure that is too low to cause symptoms of the disease because blood flow is too slow. If blood flow is too slow to deliver oxygen and nutrients to vital organs such as the brain, heart, and kidneys, the organs will not function normally and may also be damaged, either temporary or permanent.
Unlike high blood pressure, low blood pressure is diagnosed based on the symptoms and not the magnitude of the blood pressure numbers. Some people have blood pressure of 90/50 without any symptoms so it can not be said to suffer from low blood pressure. However, people who have high blood pressure may experience symptoms of low blood pressure if their blood pressure down to 100/60.
In pregnancy, blood pressure tends to fall. Normal blood pressure in pregnant women may be lower than 100/60. Blood pressure should always be monitored by a health worker during pregnancy.
Is low blood pressure is harmful to health?
People who have low blood pressure have a lower risk for stroke, kidney disease and heart.
Athletes, people who exercise regularly, people who have a healthy weight, and people who smoke tend to have lower blood pressure. Low blood pressure is good for health as long as it is not too low to cause symptoms and damage organs.
What are the symptoms of low blood pressure?
When blood pressure is not enough to draw blood to the organs, these organs can not work properly and can be damaged either temporary or permanent. Symptoms of low blood pressure raised by the specific cause low blood pressure. For example, if the blood flow to the brain is insufficient, so the brain cells do not get enough oxygen and nutrients, people will feel dizzy, or even fainted.
Symptoms of low blood pressure as a result of certain diseases, among others:
Orthostatic hypotension: Switching from a sitting or lying position to a standing position often cause symptoms of low blood pressure. This occurs because standing causes blood collects in the veins in your lower body thus lowering blood pressure. If a person already has low blood pressure, the stand will make people dizzy or even fainting. This is called orthostatic hypotension. Normally, a person is able to adapt to changes in blood pressure when changing positions quickly so as not to cause the symptoms of orthostatic hypotension.
Heart disease: chest pain (angina) or heart attack can occur when blood flow to the coronary vessels is not enough.
Kidney disease: If the blood flow to the kidneys is inadequate, the kidneys are not able to dispose of substances that are harmful to the body optimally so that the levels of these substances in the blood increase and cause complications.
Shock: That is a life-threatening condition in which low blood pressure constantly resulting in failure of organ function such as kidneys, liver, lungs, and brain in a short time.
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Different causes of low blood pressure
Circumstances which lowers blood volume decreases cardiac output (amount of blood pumped by the heart, and drugs are the cause of low blood pressure are found.
Dehydration usually occurs in patients with nausea, vomiting, diarrhea, prolonged or excessive exercise that makes more blood flow to the muscles rather than to the vital organs. More body fluid is lost when someone vomiting and diarrhea, especially if the person is not drinking sufficient amounts. Dehydration can also occur due to fever or heat. Moderate to severe dehydration may cause orthostatic hypotension. While severe dehydration for long periods can lead to shock, kidney failure, loss of consciousness, acidosis (too much acid in the body), coma, and even death.
Moderate to severe bleeding can lower blood volume in the body quickly, resulting in low blood pressure or orthostatic hypotension. Bleeding can occur because of accidents, complications of surgery, or gastrointestinal disorders such as gastric ulcers, tumors, or diverticulosis. Heavy bleeding that happens quickly can cause shock and death.
Severe inflammation of the organs in the body, such as acute pancreatitis, can cause low blood pressure. In acute pancreatitis, fluid out of the blood vessels leading to inflamed tissue so that the blood in the blood vessels become more concentrated and the volume is reduced.
In addition due to the reduced volume of blood in the blood vessels, lower blood pressure can also be caused by the following things.
Heart disease, such as heart muscle weakness, pericarditis (inflammation of the lining of the heart), pulmonary embolism (blockage in the pulmonary veins), and bradycardia (heart rate too slow).
Medications, such as anti-hypertensive drugs, diuretics, antidepressants, alcohol, and drugs.
Vasovagal reflex that usually occurs because of emotional distress.
Adrenal insufficiency, eg, Addison's disease.
Septicemia, an infection so severe that the bacteria made it into the bloodstream.
Anaphylactic shock, an allergic reaction that is life threatening.
How to cope with low blood pressure?
Low blood pressure in healthy individuals without symptoms or signs of organ damage does not require any treatment. Everyone who experienced symptoms or complications from low blood pressure should get to a physician. The doctor will find out the cause of low blood pressure and provide appropriate treatment. If low blood pressure occurs due to consumption of antihypertensive drugs on a regular basis, consult a doctor immediately. Do not stop or regulate its own dose of antihypertensive drugs were being taken without consulting a physician first.
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