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Diagnosis andManagement ofRuptured Thoracic Aortic Aneurysms
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4. Hiratzka LF, Bakris GL, Beckman JA, Bersin RM, Carr VF, Casey DE, et al. 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. Circulation. 2010;121:e266–369.
5. Davies RR, Goldstein LJ, Coady MA, Tittle SL, Rizzo JA, Kopf GS, etal. Yearly rupture or
dissection rates for thoracic aortic aneurysms: simple prediction based on size. Ann Thorac Surg. 2002;73:17–27.
6. Lau C, Gaudino M, Iannacone EM, Gambardella I, Munjal M, Ohmes LB, etal. Retrograde
cerebral perfusion is effective for prolonged circulatory arrest in arch aneurysm repair. Ann Thorac Surg. 2018;105:491–7.
7. Ehrlich MP, Grabenwöger M, Kilo J, Kocher AA, Grubhofer G, Lassnig AM, et al. Surgical
treatment of acute type A dissection: is rupture a risk factor? Ann Thorac Surg. 2002;73:1843–8.
8. Cowan JA, Dimick JB, Henke PK, Huber TS, Stanley JC, Upchurch GR.Surgical treatment of
intact thoracoabdominal aortic aneurysms in the United States: hospital and surgeon volume­related outcomes. J Vasc Surg. 2003;37:1169–74.
9. Patel VI, Mukhopadhyay S, Ergul E, Aranson N, Conrad MF, Lamuraglia GM, etal. Impact of
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10. Gaudino M, Lau C, Munjal M, Girardi LN.Open repair of ruptured descending thoracic and
thoracoabdominal aortic aneurysms. J Thorac Cardiovasc Surg. 2015;150:814–21.
11. Burke CR, Bavaria JE.The role of thoracic endovascular repair in chronic type B aortic dissec-
tion. Semin Thorac Cardiovasc Surg. 2019;32(1):21–4.
12. Khoynezhad A, Toluie S, Al-Atassi T.Treatment of the chronic type B aortic dissection: the
pro-endovascular argument. Semin Thorac Cardiovasc Surg. 2017;29:131–6.
13. Cowan JA, Dimick JB, Wainess RM, Henke PK, Stanley JC, Upchurch GR.Ruptured tho-
racoabdominal aortic aneurysm treatment in the United States: 1988 to 1998. J Vasc Surg. 2003;38:319–22.
14. Lewis ME, Ranasinghe AM, Revell MP, Bonser RS.Surgical repair of ruptured thoracic and
thoracoabdominal aortic aneurysms. Br J Surg. 2002;89:442–5.
15. Barbato JE, Kim JY, Zenati M, Abu-Hamad G, Rhee RY, Makaroun MS, etal. Contemporary
results of open repair of ruptured descending thoracic and thoracoabdominal aortic aneurysms. J Vasc Surg. 2007;45:667–76.
16. Jonker FHW, Verhagen HJM, Lin PH, Heijmen RH, Trimarchi S, Lee WA, etal. Open surgery
versus endovascular repair of ruptured thoracic aortic aneurysms. J Vasc Surg. 2011;53:1210–6.
17. Jonker FHW, Trimarchi S, Verhagen HJM, Moll FL, Sumpio BE, Muhs BE.Meta-analysis
of open versus endovascular repair for ruptured descending thoracic aortic aneurysm. J Vasc Surg. 2010;51:1026–32.
18. Zanetti PP, Krasoń M, Walas R, Cebotaru T, Popa C, Vintila B, etal. “Open” repair of ruptured
thoracoabdominal aortic aneurysm (experience of 51 cases). Kardiochir Torakochirurgia Pol. 2015;12:119–25.
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19. Lau C, Gaudino M, Gambardella I, Mills E, Munjal M, Elsayed M, et al. Reoperative
repair of descending thoracic and thoracoabdominal aneurysms. Eur J Cardiothorac Surg. 2017;52:501–7.
20. Coselli JS, LeMaire SA, Köksoy C, Schmittling ZC, Curling PE.Cerebrospinal uid drainage
reduces paraplegia after thoracoabdominal aortic aneurysm repair: results of a randomized clinical trial. J Vasc Surg. 2002;35:631–9.
21. Riley SP, Donnelly MJ, Khatib D, Warren C, Schroeder KM.Post-dural puncture headaches
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results of endovascular treatment for descending thoracic acute aortic syndromes. Ann Vasc Surg. 2013;27:1029–35.
26. Minami T, Imoto K, Uchida K, Karube N, Yasuda S, Choh T, etal. Thoracic endovascular
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27. Doss M, Wood JP, Balzer J, Martens S, Deschka H, Moritz A.Emergency endovascular inter-
ventions for acute thoracic aortic rupture: four-year follow-up. J Thorac Cardiovasc Surg. 2005;129:645–51.
28. Geisbüsch P, Kotelis D, Weber TF, Hyhlik-Dürr A, Böckler D.Endovascular repair of ruptured
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30. Hellgren T, Wanhainen A, Steuer J, Mani K.Outcome of endovascular repair for intact and
ruptured thoracic aortic aneurysms. J Vasc Surg. 2017;66:21–8.
31. Hammo S, Larzon T, Hultgren R, Wanhainen A, Mani K, Resch T, etal. Outcome after endo-
vascular repair of ruptured descending thoracic aortic aneurysm: a national multicentre study. Eur J Vasc Endovasc Surg. 2019;57:788–94.
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C. Lau et al.
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ofChronic Thoracic, Abdominal, andThoracoabdominal Aortic Aneurysms
MelindaS.Schaller, WinonaW.Wu, andMarcL.Schermerhorn
Introduction
Aortic disease can be attributed as the cause of death in nearly 10,000 individuals a year in the United States [1]. Thoracic aortic aneurysms (TAA) are those of the aortic root, ascending aortic, aortic arch and descending aorta above the diaphragm (Fig.1). In some individuals, multiple segments may be involved. When both the thoracic segment and the abdominal segment of the aorta are aneurysmal, this is referred to as a thoracoabdominal aneurysm (TAAA) (Fig.2). Normal diameters of the different thoracic aortic segments vary based on age and gender, but generally, any localized dilation greater than 50% of predicted is considered aneurysmal [2]. Of TAA, 60% involve the root/ascending aorta, 10% involve the arch, 40% involve the descending portion, and 10% are TAAA [3]. The overall incidence of thoracic aneurysms is approximately 10 per 100,000 person years, though incidence rates increase substantially with age [4]. The average age at diagnosis is 69years, but women are often older than their male counterparts, with women on average being diagnosed at the age of 76years and men at the age of 63years [4]. There are several conditions that predispose individuals to the development of a TAA, including genetic syndromes such as Marfan syndrome, Loeys-Dietz syndrome, Ehlers­Danlos syndrome, and Turner syndrome; inammatory diseases such as Takayasu and Behcet disease; and anatomic variants such as a bicuspid aortic valve, right­sided aortic arch, or aberrant right subclavian artery [2].
Abdominal aortic aneurysms (AAA) involve the segment of the aortic below the diaphragm. Abdominal aortic aneurysms are dened by an increase in the aortic diameter by 50% compared with normal, adjacent aorta; in most individuals, this would be a size greater than 3cm [5]. The majority of AAA, approximately 90%, involve the infrarenal segment, but any abdominal segment can be involved
M. S. Schaller · W. W. Wu · M. L. Schermerhorn (*) Division of Vascular Surgery, Beth Israel Deaconess Medical Center, Boston, MA, USA e-mail: mscherm@bidmc.harvard.edu
J. S. Coselli et al. (eds.), Aortic Dissection and Acute Aortic Syndromes,
https://doi.org/10.1007/978-3-030-66668-2_32
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Fig. 1 Thoracic aortic aneurysms. These include (a) the aortic root and ascending aorta, (b) the aortic arch, and (c) the descending aorta
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Fig. 2 The Crawford classication of thoracoabdominal aortic aneurysms (TAAA). (a) Type I TAAA, extends from the left subclavian (LSA) to the suprarenal aorta; (b) Type II TAAA, extends from the LSA to the aortic bifurcation; (c) Type III TAAA, extends from the distal descending thoracic aorta to the aortic bifurcation; (d) Type IV TAAA, extends from the supraceliac aorta to the aortic bifurcation
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Fig. 3 Abdominal aortic aneurysms. These include (a) infrarenal, (b) juxtarenal, and (c) suprarenal
(Fig.3)[6]. The prevalence of AAA is likely between 3% and 10% of those older than 50years, but this will vary in populations depending on the prevalence of associ­ated risk factors [7]. The most relevant modiable risk factor for AAA is smoking [8]. Risk of developing an AAA increases with age and is substantially greater in men [9].
Clinical Manifestations, Screening, andDiagnosis
The majority of patients with either chronic TAA or AAA are asymptomatic and these aneurysms are diagnosed incidentally when imaging studies are obtained for other reasons. TAA can occasionally be recognized on chest x-rays as a widened mediastinum, increased girth of the aortic knob, or as a cause of tracheal deviation. Aneurysms of the root can lead to aortic regurgitation, which can occasionally be identied on physical exam. When TAA become large, they can sometimes lead to local compressive symptoms, such as that of the trachea or bronchus, which can lead to cough, shortness of breath, or wheezing. If the esophagus is compressed, this can lead to dysphagia [3]. If a TAA is suspected, the diagnostic studies of choice are either a CT or MR angiogram (CTA or MRA). Additionally, transthoracic or trans­esophageal echocardiography is useful for imaging and surveillance of the aortic root and can diagnose the degree of regurgitation, if present.
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Aneurysms of the abdominal aorta are occasionally diagnosed on x-rays of the spine or abdominal cavity. They may also be appreciated on physical exam, although this is not a reliable way to exclude an aneurysm. An important aspect of the evalu­ation of a patient with an AAA is to palpate the aorta to elicit the presence of tender­ness, necessitating expeditious repair. Like their thoracic counterparts, AAA are best imaged with a CT or MR angiogram, as this will give the clinician the most information about anatomic features that would impact the timing and technical aspects regarding repair. Abdominal ultrasound is also an important imaging modal­ity for AAA, as it can be used for both screening and following growth of the aneu­rysm over time. Abdominal ultrasound is a useful modality for surveillance as it is reproducible, readily attainable, and non-invasive. Several studies have demon­strated that a single, ultrasound-based screening exam for AAA can effectively reduce mortality related to aneurysms as well as rupture risk [1013]. These studies found that screening decreased aneurysm-related mortality by 40% and reduced aneurysm rupture by 50% [12, 13].
M. S. Schaller et al.
Natural History
The natural history of TAA is to increase in size with an average growth rate of about 0.1–0.42 cm/year [14, 15]. Smaller TAA (4 cm) typically grow around
0.08cm/year whereas large aneurysms grow at a faster rate [16]. The rate of growth is also affected by the location of the TAA, with those of the ascending aorta grow­ing more slowly than those of the descending thoracic aorta [16, 17]. Abdominal aortic aneurysms between 3 and 4cm grow slowly with a<10% increase in size per year [18, 19]. Those AAA 4 cm and larger tend to grow approximately 10% per year, although there is substantial variability among individuals [18, 20].
As aneurysms increase in size, the overall risk of rupture also increases. For TAA the yearly risk of rupture of aneurysms smaller than 5cm is less than 5% compared to a yearly risk of approximately 16% for those greater than 6cm [16]. A similar trend holds true for AAA.In the Aneurysm Detection and Management (ADAM) trial which reported the rupture risk for those with AAA who declined or were unt for repair, the annual risk of rupture for aneurysms between 4 and 5cm was 0.5–5%, for those between 5.5 and 5.9cm was 9%, for those between 6 and 6.9cm was 10%, and for those greater than 7cm was 33% [21, 22].
Medical Management Strategies
The most important risk factor modication that can be made during aneurysm sur­veillance is smoking cessation [23, 24]. While risk factor modication in cardiovas­cular disease is well-established and often includes lipid-lowering agents such as statins and hemodynamic control with agents such as beta blockers and ACE
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inhibitors, data to support their use to decrease aneurysm expansion or rupture risk are lacking [2528]. Although, perioperative statin therapy has been found to improve long-term survival in patients undergoing AAA repair, so their use is rec­ommended in this patient population unless contraindications exist [29]. Investigations into the use of medications such as doxycycline, which can inhibit matrix metalloproteinases, have demonstrated no benet to reduce aneurysm growth [30, 31]. During an aneurysm surveillance period, patients should be encouraged to stop smoking and their general health optimized when possible, including treatment of hypertension, dyslipidemia, and participation in a regular exercise regimen [3234].
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Surveillance Strategies
For both thoracic and abdominal aortic aneurysms, the timing and modality of sur­veillance imaging will depend on the initial size of the aortic aneurysm, its location, and its rate of expansion during the surveillance period. For ascending aortic aneu­rysms that are degenerative in nature, those smaller than 4cm can be followed yearly with echocardiography, to reduce cumulative radiation exposure, or cross­sectional imaging. Once the ascending aorta reaches 4.5cm, or the rate of growth is greater than 0.5cm/year, one should obtain surveillance imaging every 6months [2]. Operative repair should be considered once the ascending aorta reaches 5.5cm in size [17, 35], though some have proposed using an aortic sizing index that takes into consideration variation in aortic size by gender and body size [36]. In individu­als with connective tissue disorders, such as Marfan syndrome, the diameter for consideration of operative repair is smaller, at 4–5cm [2, 17]. Size criteria and tim­ing for surveillance of aneurysms of the aortic arch are similar to those of the ascending aorta, with operative repair being recommended in appropriate candi­dates at a size of 5.5cm [15]. For the descending thoracic aorta and for TAAA, elective repair for asymptomatic degenerative aneurysms is recommended at a diameter of 5.5–6cm, depending on patient health factors and anatomic and techni­cal considerations; if an endovascular option exists, one may consider repair at a diameter of 5.5cm versus waiting to 6cm for those who will require an open repair due to the increased morbidity and mortality associated with open repairs [37]. Once an aneurysm is approaching a size where operative repair would be recom­mended, those who have been screened with ultrasound or MRA should have a CTA performed. This is the ideal study for identifying anatomic features that can impact repair strategies and is the best study for delineating the distribution of aortic calcication.
Once an aneurysm of the abdominal aorta is identied, these individuals should enter into a regular surveillance program. Regular surveillance has been found to be safe until the aneurysm reaches a size of 5.5cm in men and between 5 and 5.4cm in women [9, 38, 39]. Surveillance intervals of 3years have been recommended for abdominal aneurysms measuring 3–3.9cm, 1year for aneurysms measuring 4–4.9,
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with intervals of 6months being recommended for those larger than 5cm [9, 40]. The majority of the recommendations for surveillance and repair of aortic aneu­rysms have been based on datasets in which women are underrepresented. Other strategies for aneurysms in women have been developed which may be more accu­rate for determining overall risk, and associated timelines for repair, including the aortic size index (aneurysm diameter (cm)/body surface area (m2)) [41]. There are certain circumstances when one may recommend operative repair prior to the aneu­rysm size threshold criteria being met, including rapid aneurysm expansion, com­bined iliac aneurysms, and aneurysm-related embolic events.
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doxycycline on aneurysm growth among patients with small infrarenal abdominal aortic aneu­rysms: a randomized clinical trial. Jama. 2020 May 26;323(20):2029–38. PubMed PMID:
32453369. Pubmed Central PMCID: PMC7251450 National Institute on Aging, National Institutes of Health (NIA-NIH). Dr Matsumura reported receiving grants from the NIH, Abbott, Cook, Medtronic, Gore, and Endologix. Dr Curci reported receiving grants from the NIH.Dr McBride reported receiving grants from the University of Maryland. Dr Larson reported receiving grants from the National Institute of Allergy and Infection Diseases. Dr Blackwelder reported receiving grants from the NIH.Dr Lam reported that she is employed
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by Genentech, although the majority of the work was completed before employment began, and that she owns stock in Genentech and Merck. Dr Terrin reported receiving grants from NIH.No other disclosures were reported.
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