aneurysm

(redirected from Aneurysms)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

aneurysm

(ăn`yo͝orĭzəm), localized dilatation of a blood vessel, particularly an arteryartery,
blood vessel that conveys blood away from the heart. Except for the pulmonary artery, which carries deoxygenated blood from the heart to the lungs, arteries carry oxygenated blood from the heart to the tissues.
..... Click the link for more information.
, or the heartheart,
muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and Function

The human heart is a pear-shaped structure about the size of a fist.
..... Click the link for more information.
. Dilatation of an artery, and therefore weakness of that portion of the arterial wall, may be rarely congenital, or it may be caused by syphilissyphilis
, contagious sexually transmitted disease caused by the spirochete Treponema pallidum (described by Fritz Schaudinn and Erich Hoffmann in 1905). Syphilis was not widely recognized until an epidemic in Europe at the end of the 15th cent.
..... Click the link for more information.
, hypertensionhypertension
or high blood pressure,
elevated blood pressure resulting from an increase in the amount of blood pumped by the heart or from increased resistance to the flow of blood through the small arterial blood vessels (arterioles).
..... Click the link for more information.
 (high blood pressure), arteriosclerosisarteriosclerosis
, general term for a condition characterized by thickening, hardening, and loss of elasticity of the walls of the blood vessels. These changes are frequently accompanied by accumulations inside the vessel walls of lipids, e.g.
..... Click the link for more information.
, bacterial and fungal infections, or penetrating injury as from a bullet or knife. An aneurysm may be asymptomatic or it may cause varying symptoms, depending upon its location and size and on whether the expanding mass is pressing on adjacent nerves or vital organs. The weakened arterial walls of an aneurysm are always in danger of sudden rupture, with resulting hemorrhage and death.

Aneurysms occur most commonly in the large arteries; the aortaaorta
, primary artery of the circulatory system in mammals, delivering oxygenated blood to all other arteries except those of the lungs. The human aorta, c.1 in. (2.54 cm) in diameter, originates at the left ventricle of the heart.
..... Click the link for more information.
, the largest vessel in the body, is the one most often affected. Ventricular aneurysms of the heart often occur after myocardial infarctionsinfarction,
blockage of blood circulation to a localized area or organ of the body resulting in tissue death. Infarctions commonly occur in the spleen, kidney, lungs, brain, and heart.
..... Click the link for more information.
. Aneurysms also occur in the arteries within the skull and in other areas of the body.

Aneurysms can be detected by echocardiogram, spin echo magnetic resonance imaging scans, coronary arteriograms, and biplane ventriculograms. Treatment, where feasible, may involve surgery to remove the aneurysm or the insertion of coiled wire to close it off. Coiled wire can only be used on aneurysms that are connected to the blood vessel by a narrowed neck. The coiling fills the aneurysm, obstructing the flow of blood into the dilatation, and blood clots form around the wire, preventing the aneurysm from bursting. Surgical excision of the dilated saclike portion of the affected artery sometimes requires the replacement of that portion by a synthetic graft, a section of vessel (made of polymer fiber) that is similar in size.

aneurysm

[′an·yə‚riz·əm]
(medicine)
Localized abnormal dilation of an artery due to weakening of the vessel wall.

aneurysm

, aneurism
a sac formed by abnormal dilation of the weakened wall of a blood vessel
References in periodicals archive ?
According to the report, there has been a rapid increase in the technology used for aortic aneurysm repair.
There is no current consensus on the optimal treatment of RVAs, and delayed venous aneurysms in a transplant allograft present unique therapeutic obstacles.
His research is focused on the surgical management of ruptured and unruptured aneurysms, Arteriovenous Malformations and dural arteriovenous fistulae, using minimally invasive techniques such as supraorbital and lateral supraorbital craniotomies.
Now the 65-year-old, from Rowley Regis, has urged others to take part in the NHS Abdominal Aortic Aneurysm programme.
Experts estimate that between 59 percent to 83 percent of patients experiencing this type of aneurysm die before reaching the hospital.
Sharp dissection through fascia revealed a 3 cm DPA saccular aneurysm and it was controlled proximally and distally using vessel loops (Fig.
The women with brain aneurysms, who ranged in age from 31-80, were found to be significantly less likely to have taken oral contraceptives or HRT during their lives.
Like coiling, the cPAX Aneurysm Treatment System is a form of endovascular repair," said Christy Foreman, director of the Office of Device Evaluation in the FDA's Center for Devices and Radiological Health.
The second method is to study a large population, dividing the incidence of ruptures by the prevalence of aneurysms.
NEW YORK--About one in four patients with abdominal aortic aneurysm may be at risk for thoracic aortic aneurysm, judging by results of a single-center retrospective study of more than 1,000 patients.
genetic predisposition--increased prevalence of AAAs in the inherited collagen disorders Marfan's syndrome and Ehlers-Danlos type IV disease, and in siblings of patients with aneurysms