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词条 Aneurysm
释义

  1. Classification

     True and false aneurysms  Morphology  Location  Size 

  2. Signs and symptoms

     Cerebral aneurysm  Abdominal aneurysm  Renal (kidney) aneurysm 

  3. Risk factors

  4. Pathophysiology

  5. Diagnosis

  6. Treatment

      Intracranial aneurysms   Aortic and peripheral aneurysms  Renal aneurysms 

  7. Epidemiology

     Pediatric aneurysms  Risk factors 

  8. Notable cases

  9. References

  10. External links

{{Other uses}}{{distinguish|ebullism|embolism}}{{Infobox medical condition (new)
| name = Aneurysm
| image = Aneurysem.jpg
| caption = Angiography of an aneurysm in a brain artery. The aneurysm is the bean-shaped object in the center of the image.
| synonyms = Aneurism
| field = Vascular surgery
| symptoms =
| complications =
| onset =
| duration =
| causes =
| risks =
| diagnosis =
| differential =
| prevention =
| treatment =
| medication =
| prognosis =
| frequency =
| deaths =
}}

An aneurysm is an outward bulging, likened to a bubble or balloon, caused by a localized, abnormal, weak spot on a blood vessel wall.[1] Aneurysms are a result of a weakened blood vessel wall, and may be a result of a hereditary condition or an acquired disease. Aneurysms can also be a nidus (starting point) for clot formation (thrombosis) and embolization. The word is from {{Lang-grc-gre|ἀνεύρυσμα}}, aneurysma, "dilation", from ἀνευρύνειν, aneurynein, "to dilate". As an aneurysm increases in size, the risk of rupture increases,[2] leading to uncontrolled bleeding. Although they may occur in any blood vessel, particularly lethal examples include aneurysms of the Circle of Willis in the brain, aortic aneurysms affecting the thoracic aorta, and abdominal aortic aneurysms. Aneurysms can arise in the heart itself following a heart attack, including both ventricular and atrial septal aneurysms.

Classification

Aneurysms are classified by type, morphology, or location.

True and false aneurysms

A true aneurysm is one that involves all three layers of the wall of an artery (intima, media and adventitia). True aneurysms include atherosclerotic, syphilitic, and congenital aneurysms, as well as ventricular aneurysms that follow transmural myocardial infarctions (aneurysms that involve all layers of the attenuated wall of the heart are also considered true aneurysms).[3]

A false aneurysm, or pseudoaneurysm, is a collection of blood leaking completely out of an artery or vein, but confined next to the vessel by the surrounding tissue. This blood-filled cavity will eventually either thrombose (clot) enough to seal the leak, or rupture out of the surrounding tissue.[3]{{rp|357}}

Pseudoaneurysms can be caused by trauma that punctures the artery, such as knife and bullet wounds,[4] as a result of percutaneous surgical procedures such as coronary angiography or arterial grafting,[5] or use of an artery for injection.[6]

Morphology

Aneurysms can also be classified by their macroscopic shape and size and are described as either saccular or fusiform. The shape of an aneurysm is not specific for a specific disease.[3]{{rp|357}} The size of the base or neck is useful in determining the chance of for example endovascular coiling.[7]

Saccular aneurysms are spherical in shape and involve only a portion of the vessel wall; they vary in size from 5 to {{convert|20|cm|0|abbr=on}} in diameter, and are often filled, either partially or fully, by a thrombus.[3]{{rp|357}}

Fusiform aneurysms ("spindle-shaped" aneurysms) are variable in both their diameter and length; their diameters can extend up to {{convert|20|cm|0|abbr=on}}. They often involve large portions of the ascending and transverse aortic arch, the abdominal aorta, or less frequently the iliac arteries.[3]{{rp|357}}

Location

Aneurysms can also be classified by their location:

  • Arterial and venous, with arterial being more common. {{Citation needed|date=July 2013}}
  • The heart, including coronary artery aneurysms, ventricular aneurysms, aneurysm of sinus of Valsalva, and aneurysms following cardiac surgery.
  • The aorta, namely aortic aneurysms including thoracic aortic aneurysms and abdominal aortic aneurysms.[8]
  • The brain, including cerebral aneurysms, berry aneurysms, and Charcot–Bouchard aneurysms.
  • The legs, including the popliteal arteries. {{Citation needed|date=July 2013}}
  • The kidney, including renal artery aneurysm and intraparechymal aneurysms.[9]
  • Capillaries, specifically capillary aneurysms.
Cerebral aneurysms, also known as intracranial or brain aneurysms, occur most commonly in the anterior cerebral artery, which is part of the circle of Willis. This can cause severe strokes leading to death. The next most common sites of cerebral aneurysm occurrence are in the internal carotid artery.[10]

Size

Abdominal aorta size classification
Ectatic or
mild dilatation 		>2.0 cm and <3.0 cm[11]
Moderate 3.0 - 5.0 cm[11]
Large or severe >5.0[11] or 5.5[12] cm

Abdominal aortic aneurysms are commonly divided according to their size and symptomatology. An aneurysm is usually defined as an outer aortic diameter over 3 cm (normal diameter of the aorta is around 2 cm),[13] or more than 50% of normal diameter that of a healthy individual of the same sex and age.[8][14] If the outer diameter exceeds 5.5 cm, the aneurysm is considered to be large.[12]

The common iliac artery is classified as:[15]

Normal Diameter ≤12 mm
Ectatic Diameter 12 to 18 mm
Aneurysm Diameter ≥18 mm

Signs and symptoms

Aneurysm presentation may range from life-threatening complications of hypovolemic shock to being found incidentally on X-ray.[16] Symptoms will differ by the site of the aneurysm and can include:

Cerebral aneurysm

{{Main|Cerebral aneurysm}}

Symptoms can occur when the aneurysm pushes on a structure in the brain. Symptoms will depend on whether an aneurysm has ruptured or not. There may be no symptoms present at all until the aneurysm ruptures.[17] For an aneurysm that has not ruptured the following symptoms can occur:

  • Fatigue
  • Loss of perception
  • Loss of balance
  • Speech problems
  • Double vision

For a ruptured aneurysm, symptoms of a subarachnoid hemorrhage may present:

  • Severe headaches
  • Loss of vision
  • Double vision
  • Neck pain or stiffness
  • Pain above or behind the eyes

Abdominal aneurysm

{{Main|Abdominal aneurysm#Signs and symptoms}}

Abdominal aortic aneurysm involves a regional dilation of the aorta and is diagnosed using ultrasonography, computed tomography, or magnetic resonance imaging. A segment of the aorta that is found to be greater than 50% larger than that of a healthy individual of the same sex and age is considered aneurysmal.[8] Abdominal aneurysms are usually asymptomatic but in rare cases can cause lower back pain or lower limb ischemia.

Renal (kidney) aneurysm

  • Flank pain and tenderness
  • Hypertension
  • Haematuria
  • Signs of hypovolemic shock

Risk factors

Risk factors for an aneurysm include diabetes, obesity, hypertension, tobacco use, alcoholism, high cholesterol, copper deficiency, increasing age, and tertiary syphilis infection.[16]{{rp|602}}

Specific infective causes associated with aneurysm include:

  • Advanced syphilis infection resulting in syphilitic aortitis and an aortic aneurysm
  • Tuberculosis, causing Rasmussen's aneurysms
  • Brain infections, causing infectious intracranial aneurysms

A minority of aneurysms are associated with genetic factors. Examples include:

  • Berry aneurysms of the anterior communicating artery of the circle of Willis, associated with autosomal dominant polycystic kidney disease[18]
  • Familial thoracic aortic aneurysms
  • Cirsoid aneurysms, secondary to congenital arteriovenous malformations

Pathophysiology

Aneurysms form for a variety of interacting reasons. Multiple factors, including factors affecting a blood vessel wall and the blood through the vessel, contribute.

Atherosclerosis. A variety of different factors, including atherosclerosis, may contribute to weakening of a blood vessel wall. The repeated trauma of blood flowing through the vessel may contribute to degeneration {{Clarify|date=July 2013}} of the vessel wall. Hypertensive injury may compound this degeneration and accelerate the expansion of the aneurysm. As the aneurysm expands, the wall tension increases.[19] {{Citation needed|date=July 2013}}

The pressure of blood within the expanding aneurysm may also injure the blood vessels supplying the artery itself, further weakening the vessel wall. Without treatment, these aneurysms will ultimately progress and rupture.[20]

Infection. A mycotic aneurysm is an aneurysm that results from an infectious process that involves the arterial wall.[21] A person with a mycotic aneurysm has a bacterial infection in the wall of an artery, resulting in the formation of an aneurysm. The most common locations include arteries in the abdomen, thigh, neck, and arm. A mycotic aneurysm can result in sepsis, or life-threatening bleeding if the aneurysm ruptures. Less than 3% of abdominal aortic aneurysms are mycotic aneurysms.[22]Syphilis. The third stage of syphilis also manifests as aneurysm of the aorta, which is due to loss of the vasa vasorum in the tunica adventitia.[23]Copper deficiency. A minority of aneurysms are caused by copper deficiency, which results in a decreased activity of the lysyl oxidase enzyme, affecting elastin, a key component in vessel walls.[24][25][26] Copper deficiency results in vessel wall thinning,[27] and thus has been noted as a cause of death in copper-deficient humans,[28] chickens and turkeys[29]

Diagnosis

Diagnosis of a ruptured cerebral aneurysm is commonly made by finding signs of subarachnoid hemorrhage on a computed tomography (CT) scan. If the CT scan is negative but a ruptured aneurysm is still suspected based on clinical findings, a lumbar puncture can be performed to detect blood in the cerebrospinal fluid. Computed tomography angiography (CTA) is an alternative to traditional angiography and can be performed without the need for arterial catheterization. This test combines a regular CT scan with a contrast dye injected into a vein. Once the dye is injected into a vein, it travels to the cerebral arteries, and images are created using a CT scan. These images show exactly how blood flows into the brain arteries. {{Citation needed|date=July 2013}}

Treatment

Historically, the treatment of arterial aneurysms has been limited to either surgical intervention, or watchful waiting in combination with control of blood pressure. At least, in case of Abdominal Aortic Aneurysm (AAA) the decision does not come without a significant risk and cost, hence, there is a great interest in identifying more advanced decision making approaches that are not solely based on the AAA diameter, but involve other geometrical and mechanical nuances such as local thickness and wall stress.[8] In recent years,{{when|date=April 2018}} endovascular or minimally invasive techniques have been developed for many types of aneurysms. Aneurysm clips are used for surgical procedure i.e. clipping of aneurysms.[30]

Intracranial aneurysms

{{main|l1=Cerebral aneurysm treatment|Cerebral aneurysm#Treatment}}

There are currently two treatment options for brain aneurysms: surgical clipping or endovascular coiling. There is currently debate in the medical literature about which treatment is most appropriate given particular situations.[31]

Surgical clipping was introduced by Walter Dandy of the Johns Hopkins Hospital in 1937. It consists of a craniotomy to expose the aneurysm and closing the base or neck of the aneurysm with a clip. The surgical technique has been modified and improved over the years.

Endovascular coiling was introduced by Italian neurosurgeon Guido Guglielmi at UCLA in 1989. It consists of passing a catheter into the femoral artery in the groin, through the aorta, into the brain arteries, and finally into the aneurysm itself. Platinum coils initiate a clotting reaction within the aneurysm that, if successful, fills the aneurysm dome and prevents its rupture.[32] Flow diverter can be used but not without complications sometimes.[33]

Aortic and peripheral aneurysms

For aneurysms in the aorta, arms, legs, or head, the weakened section of the vessel may be replaced by a bypass graft that is sutured at the vascular stumps. Instead of sewing, the graft tube ends, made rigid and expandable by nitinol wireframe, can be easily inserted in its reduced diameter into the vascular stumps and then expanded up to the most appropriate diameter and permanently fixed there by external ligature.[34][35] New devices were recently developed to substitute the external ligature by expandable ring allowing use in acute ascending aorta dissection, providing airtight (i.e. not dependent on the coagulation integrity), easy and quick anastomosis extended to the arch concavity[36][37][38] Less invasive endovascular techniques allow covered metallic stent grafts to be inserted through the arteries of the leg and deployed across the aneurysm.

Renal aneurysms

Renal aneurysms are very rare consisting of only 0.1–0.09%[39] while rupture is even more rare.[39][40] Conservative treatment with control of concomitant hypertension being the primary option with aneurysms smaller than 3 cm. If symptoms occur, or enlargement of the aneurysm, then endovascular or open repair should be considered.[41] Pregnant women (due to high rupture risk of up to 80%) should be treated surgically.[42]

Epidemiology

Incidence rates of cranial aneurysms are estimated at between 0.4% and 3.6%. Those without risk factors have expected prevalence of 2–3%.[10]{{rp|181}} In adults, females are more likely to have aneurysms. They are most prevalent in people ages 35 – 60, but can occur in children as well. Aneurysms are rare in children with a reported prevalence of .5% to 4.6%. The most common incidence are among 50-year-olds, and there are typically no warning signs. Most aneurysms develop after the age of 40. {{Citation needed|date=July 2013}}

Pediatric aneurysms

Pediatric aneurysms have different incidences and features than adult aneurysms.[43] Intracranial aneurysms are rare in childhood, with over 95% of all aneurysms occurring in adults.[10]{{rp|235}}

Risk factors

Incidence rates are two to three times higher in males, while there are more large and giant aneurysms and fewer multiple aneurysms.[10]{{rp|235}} Intracranial hemorrhages are 1.6 times more likely to be due to aneurysms than cerebral arteriovenous malformations in whites, but four times less in certain Asian populations.[10]{{rp|235}}

Most patients, particularly infants, present with subarachnoid hemorrhage and corresponding headaches or neurological deficits. The mortality rate for pediatric aneurysms is lower than in adults.[10]{{rp|235}}

Notable cases

  • Lucille Ball, who died from an aortic rupture in the abdominal area days after having undergone apparently successful heart surgery for a dissecting aortic aneurysm[44][45][46]
  • Laura Branigan, who died of a cerebral aneurysm
  • David Cone, who suffered from an aneurysm and missed most of the 1996 baseball season
  • John Olerud, suffered an aneurysm in 1989 and forced to wear batting helmet on field all of his career since then
  • Albert Einstein, who died from a repaired aortic aneurysm[47]
  • Thomas Mikal Ford, who died from a ruptured aneurysm in his abdomen. He was 52.
  • Charles de Gaulle, who died from an aneurysm within his neck[48]
  • Richard Holbrooke, who died from a thoracic aortic aneurysm[49]
  • Stuart Sutcliffe, who died from an aneurysm in his brain's right hemisphere[50]
  • John Ritter, died September 11, 2003 of a misdiagnosed thoracic aortic dissection (aortic aneurysm).[51][52]
  • Isabel Granada, who died of a cerebral aneurysm[53][54]
  • Geoffrey Thompson, who died of a brain aneurysm at his daughter's wedding, hosted at his theme park, Blackpool Pleasure Beach.

References

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19. ^as described by the Law of Laplace
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45. ^{{cite web|url=http://www.highbeam.com/doc/1P2-1187461.html|archive-url=https://web.archive.org/web/20121106080946/http://www.highbeam.com/doc/1P2-1187461.html|dead-url=yes|archive-date=November 6, 2012|title=Article: Lucille Ball, Pioneer of Television Comedy, Dies at 77|access-date=August 31, 2009}}
46. ^{{cite news|last=Ball|first=Lucille| name-list-format = vanc |title=Ball dies of ruptured aorta|url=http://articles.latimes.com/1989-04-27/news/mn-1618_1_love-lucy-aorta-emergency-heart-surgery |newspaper=Los Angeles Times |date=April 27, 1989 |access-date=May 12, 2013}}
47. ^{{cite web | title = Dr. Albert Einstein Dies in Sleep at 76; World Mourns Loss of Great Scientist | url = https://www.nytimes.com/learning/general/onthisday/bday/0314.html | date = April 19, 1955 | work = The New York Times }}
48. ^{{cite news|title=World Leaders to Gather in Paris to Honour General de Gaulle|newspaper=The Times|date=11 November 1970}}
49. ^{{cite web | title = US Diplomat Holbrooke dies after tearing arota | url = http://www.nbcnews.com/id/40649624/ns/politics/t/us-diplomat-holbrooke-dies-after-tearing-aorta/ }}
50. ^{{cite web | title = Stuart Sutcliffe: Legacy of the fifth Beatle 50 years after his death | url = http://www.liverpoolecho.co.uk/news/liverpool-news/stuart-sutcliffe-legacy-fifth-beatle-3346849 | work = Echo | first = Jade | last = Wright | name-list-format = vanc | date = 9 April 2012 }}
51. ^{{cite web|last=Considine|first=Bob| name-list-format = vanc |title=John Ritter’s widow talks about wrongful death suit | url = http://www.today.com/id/22989512#.UpxHNOI8rIU |publisher=today.com|date=February 4, 2008}}
52. ^{{cite web|title=John Ritter: 1948–2003|url=http://www.people.com/people/article/0,,628262_2,00.html|publisher=people.com|page=2|date=September 18, 2003}}
53. ^{{cite news|last1=Roxas|first1=Patricia Ann|title=Report: Isabel Granada in coma in Qatar hospital|url=http://entertainment.inquirer.net/247654/report-isabel-granada-coma-qatar-hospital|access-date=25 October 2017|work=Inquirer.net|date=25 October 2017}}
54. ^{{cite news|last1=ALG|title=Isabel Granada passes away in Qatar|url=http://www.gmanetwork.com/news/showbiz/chikaminute/631946/isabel-granada-passes-away-in-qatar/story/|access-date=5 November 2017|work=GMA News|date=5 November 2017}}

External links

{{Medical resources
| DiseasesDB = 15088
| ICD10 = {{ICD10|I|72||i|70}}
| ICD9 = {{ICD9|442}}
| ICDO =
| OMIM =
| MedlinePlus = 001122
| eMedicineSubj =
| eMedicineTopic =
| MeshID = D000783
}}{{Commons category|Aneurysms}}{{Wiktionary}}
  • @neurIST – Integrated Biomedical Informatics for the Management of Cerebral Aneurysms
  • Brain aneurysm and percent packing calculator
{{Vascular diseases}}{{Cerebrovascular diseases}}{{Authority control}}

2 : Gross pathology|Vascular diseases
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