利用者:HamnerHitt832
出典: くみこみックス
An abdominal aortic aneurysm, additionally termed AAA or even triple A, is actually a bulging, damaged place in the wall membrane of the aorta (the largest artery in the human body) producing in an abnormal extending or ballooning larger than Fifty percent of the normal dimension (width). The aorta stretches upwards from the top of the left ventricle of the heart in the chest region (ascending thoracic aorta), then figure just like a candy cane (aortic arch) downwards through the chest section (descending thoracic aorta) within the abdomen (abdominal aorta). The aorta provides oxygen rich blood pumped from the heart to the rest of the body.
The most usual place of arterial aneurysm foundation is the abdominal aorta, mainly, the segment of the abdominal aorta below the filtering system. An abdominal aneurysm centrally located below the kidneys is called an infrarenal aneurysm. An aneurysm may be indicated by way of its place, condition, as well as trigger. The figure of an aneurysm is described as being fusiform or saccular which usually can help to determine a true aneurysm. The more common fusiform shaped aneurysm bulges or balloons out on all sides of the aorta. A saccular shaped aneurysm bulges or balloons out only on one side. A pseudoaneurysm, or untrue aneurysm, is an enlargement of just the outer part of the blood vessel wall structure. A false aneurysm may perhaps happen to be the result of a prior surgical treatment or even trauma. Sometimes, a split can easily take place upon the inside part of the vessel resulting in bloodstream filling in between the layers of the blood vessel wall creating a pseudoaneurysm. The aorta is under steady pressure as blood is ejected through the heart. With each heart beat, the walls of the aorta distend (broaden) and after that recoil (spring back again), applying continual pressure or tension on the currently weakened aneurysm wall. Therefore, there is a opportunity for break (bursting) or dissection (separation of the tiers of the aortic wall) of the aorta, which might cause life-threatening lose blood (uncontrolled blood loss) and, potentially, dying. The larger the aneurysm becomes, the greater the risk of crack.
Because an aneurysm may keep going to expand in size, along with gradual weakening of the artery walls, medical involvement could be essential. Stopping rupture of an aneurysm is 1 of the targets of treatments.
Just what causes an abdominal aortic aneurysm to occur? An abdominal aortic aneurysm may be formed by numerous variables that result in the breaking down of the well-organized structural elements (proteins) of the aortic wall that give support and also stabilize the wall surface. The exact cause is not perfectly known. Vascular disease (a build-up of plaque, which is a deposit of fatty substances, cholesterol, cellular waste products, calcium, and fibrin in the inner lining of an artery) is assumed to play an important factor in aneurysmal condition, including the threat aspects associated with atherosclerosis, such as: - age (greater than 60) - male (happening in males is 4 to five times greater than that of women) - family heritage (first level relatives such as dad or brother) - genetic aspects - hyperlipidemia (increased fats in the blood) - hypertension (high blood pressure) - smoking - diabetes
Some other conditions that could possibly lead to an abdominal aneurysm involve: - genetic disorders of connective tissue (abnormalities that can affect tissues such as bones, cartilage, heart, and blood vessels), such as Marfan syndrome, Ehlers-Danlos syndrome, Turner's syndrome, and polycystic kidney disease - congenital (present at birth) syndromes, such as bicuspid aortic valve or coarctation of the aorta - giant cell arteritis - a disease that causes inflammation of the temporal arteries and other arteries in the head and neck, causing the arteries to narrow, reducing blood flow in the affected areas; may cause persistent headaches and vision loss - trauma - infectious aortitis (infections of the aorta) due to infections such as syphilis, salmonella, or staphylococcus. These infectious conditions are rare.
What are the actual signs and symptoms of abdominal aortic aneurysms? Abdominal aortic aneurysms might become asymptomatic (without having symptoms) or symptomatic (along with signs and symptoms). Pertaining to 3 of every four abdominal aortic aneurysms are asymptomatic and also may be observed upon timetable physical check-up by the discovery of a pulsating bulk in the abdomen. An aneurysm may additionally be discovered through x-ray, computed tomography scan (CT scan), or magnetic resonance imaging (MRI) that is being done for other conditions. Because abdominal aneurysm may be existing without signs or symptoms, it is known to as the "silent killer"? because it may crack ahead of getting identified. Discomfort is the most typical symptom of an abdominal aortic aneurysm. The pain associated with an abdominal aortic aneurysm may be situated in the abdomen, chest, lower back, or groin area. The pain could be intense or even dull. The occurrence of suffering is often connected with the upcoming (about to occur) break of the aneurysm. Acute, unexpected onset of severe suffering in the back and/or abdomen could characterize rupture and is a life threatening medical urgent situation. The signs of an abdominal aortic aneurysm may resemble some other healthcare conditions or troubles. Constantly consult your physician for more information.
How are aneurysms diagnosed? In addition to a complete medical background and also physical examination, analysis methods for an aneurysm could include any, or a combination, of the following: - computed tomography check (Also called a CT or CAT scan.) - a diagnostic image procedure that uses a combination of x-rays as well as computer system technologies to produce cross-sectional images (often called pieces), both horizontally and vertically, of the human body. A CT scan shows detailed images of any part of the human body, including the bones, muscle tissues, body fat, and internal organs. CT scans are more complete than general x-rays. - magnetic resonance imaging (MRI) - a analytic procedure that uses a combo of huge magnets, radiofrequencies, and a pc to produce comprehensive images of body organs and structures within the body. - ultrasound - uses high-frequency sound waves and a personal computer to create pictures of blood vessels, tissues, and body organs. Ultrasounds are used to look at internal organs as they perform, and to determine blood flow through various vessels. - arteriogram (angiogram) - an x-ray picture of the blood vessels used to consider numerous disorders, such as aneurysm, stenosis (narrowing of the blood vessel), or blockages. A absorb dyes (contrast) will be inserted through a thin flexible tube placed in an artery. This color makes the blood vessels visible on x-ray.
Cure for abdominal aortic aneurysms:
Special therapy will certainly be determined by your medical professional primarily based upon: - your age, overall health, and medical history - extent of the disease - your signs and symptoms - your tolerance of specific medications, procedures, or therapies - expectations for the course of the disease - your opinion or preference
Treatment may include: - routine ultrasound methods - to observe the dimensions and level of progress of the aneurysm - controlling or modifying threat variables - steps such as quitting smoking cigarettes, controlling blood sugar if suffering from diabetes, losing weight if overweight or obese, and controlling dietary fat intake may help to manage the development of the aneurysm - medication - to control variables such as hyperlipidemia (raised levels of fats in the blood) and/or high blood pressure - surgery
Asymptomatic aneurysms might not involve operative intervention until they attain a certain dimension or are mentioned to be increasing in size over a certain period of time. Guidelines regarded when doing medical choices involve, but are not limited to, the following: - aneurysm size greater than 5 centimeters (about two inches) - aneurysm growth rate 0.5 centimeters (slightly less than one-fourth inch) over a period of six months to one year - patient's ability to tolerate the procedure
For symptomatic aneurysms, immediate assistance is suggested.
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