Thoracic aortic aneurysm
|Thoracic aortic aneurysm|
Thoracic aortic aneurysm with arrow marking the lateral border of the aorta.
|Classification and external resources|
|eMedicine||article/761627 article/424904 article/418480|
A thoracic aortic aneurysm is an aortic aneurysm that presents primarily in the thorax.
A thoracic aortic aneurysm is the "ballooning" of the upper aspect of the aorta, above the diaphragm. Untreated or unrecognized they can be fatal due to dissection or "popping" of the aneurysm leading to nearly instant death. Thoracic aneurysms are less common than an abdominal aortic aneurysm. However, a syphilitic aneurysm is more likely to be a thoracic aortic aneurysm than an abdominal aortic aneurysm.
There are a number of causes,  Aneurysms in patients younger than 40 usually involve the ascending aorta due to a weakening of the aortic wall associated with connective tissue disorders like the Marfan and Ehler-Danlos syndromes or congenital bicuspid aortic valve. Younger patients may develop aortic aneurysms of the thoracoabdominal aorta after an aortic dissection. It can also be caused by blunt injury.
Atherosclerosis is the principal cause of descending aortic aneurysms, while aneurysms of the aortic arch may be due to dissection, atherosclerosis or inflammation.
The diagnosis of thoracic aortic aneurysm usually involves patients in their 60s and 70s.
Hypertension and cigarette smoking are the most important risk factors, though the importance of genetic factors has been increasingly recognized. Approximately 10% of patients may have other family members who have aortic aneurysms. It is also important to note that individuals with a history of aneurysms in other parts of the body have a higher chance of developing a thoracic aortic aneurysm.
Guidelines were issued in March 2010 for early detection of thoracic aortic disease, by the American College of Cardiology, the American Heart Association, and other groups. Among the recommendations:
- First-degree relatives of people with thoracic aortic aneurysm or dissection should have aortic imaging to identify asymptomatic disease.
- People with symptoms suggestive of thoracic aortic dissection should be routinely evaluated "to establish a pretest risk of disease that can then be used to guide diagnostic decisions."
- People diagnosed with Marfan syndrome should immediately have an echocardiogram to measure the aorta, and followed up 6 months later to check for aortic enlargement.
The size cut off for aortic aneurysm is crucial to its treatment. A thoracic aorta greater than 4.5 cm is defined as aneurysmal, while a size greater than 6 cm is the distinction for treatment, which can be either endovascular or surgical, with the former reserved for pathology at the descending aorta.
The principal causes of death due to thoracic aneurysmal disease are dissection and rupture. Once rupture occurs, the mortality rate is 50–80%, and most deaths in patients with the Marfan syndrome are the result of aortic disease.
Each year in the United States, some 45,000 people die from diseases of the aorta and its branches. Acute aortic dissection, a life-threatening event due to a tear in the aortic wall, affects 5 to 10 patients per million population each year, most often men between the ages of 50 and 70; of those that occur in women younger than 40, nearly half arise during pregnancy. The majority of these deaths occur as a result of complications of thoracic aneurysmal disease.
- Thoracic Aortic Aneurysm at eMedicine
- Aneurysms: Aneurysms and Aortic Dissection at Merck Manual of Diagnosis and Therapy Home Edition
- Thoracic Aortic Disease - Northwestern Memorial Hospital. Thoracic Aortic Aneurysm
- Hiratzka LF, Bakris GL, Beckman JA, et al. (April 2010). "2010 ACCF/AHA/AATS/ACR/ASA/SCA/SCAI/SIR/STS/SVM Guidelines for the diagnosis and management of patients with thoracic aortic disease. A Report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines, American Association for Thoracic Surgery, American College of Radiology,American Stroke Association, Society of Cardiovascular Anesthesiologists, Society for Cardiovascular Angiography and Interventions, Society of Interventional Radiology, Society of Thoracic Surgeons,and Society for Vascular Medicine". J. Am. Coll. Cardiol. 55 (14): e27–e129. doi:10.1016/j.jacc.2010.02.015. PMID 20359588.
- Makaroun MS, Dillavou ED, Kee ST, et al. (January 2005). "Endovascular treatment of thoracic aortic aneurysms: results of the phase II multicenter trial of the GORE TAG thoracic endoprosthesis". J. Vasc. Surg. 41 (1): 1–9. doi:10.1016/j.jvs.2004.10.046. PMID 15696036.
- "Treatment Considerations related to Thoracic Aortic Aneurysm". Retrieved 2010-10-23.