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Review
Acute aortic syndrome
Síndrome aórtico agudo
Isidre Vilacostaa,
Corresponding author
i.vilacosta@gmail.com

Corresponding author.
, Carlos Ferreraa, Alberto San Románb
a Instituto Cardiovascular, Hospital Clínico San Carlos, Madrid, Spain
b Instituto de Ciencias del Corazón, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">The nosography of acute aortic syndrome &#40;AAS&#41; was described in 2001&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It refers to a heterogeneous group of patients with a similar clinical presentation&#44; most notably &#39;aortic pain&#39;&#46; It encompasses four types of acute aortic lesions&#58; classical aortic dissection &#40;CD&#41;&#44; intramural haematoma &#40;IMH&#41;&#44; penetrating aortic ulcer &#40;PAU&#41; and incomplete dissection &#40;ID&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> This review aims to outline the pathogenesis of AAS and update the epidemiology&#44; diagnostic strategy and current management of these patients&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Components of acute aortic syndrome&#46; Definition&#44; pathophysiology and classifications</span><p id="par0010" class="elsevierStylePara elsevierViewall">The morpho-anatomical characteristics of the constituent elements of AAS can be seen in <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">From a surgical and prognostic point of view&#44; patients with AAS are classified into two categories depending on whether the lesion affects &#40;type A&#41; or not &#40;type B&#41; the ascending aorta&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> There is a third category &#40;non-A&#44; non-B type&#41; in which the lesion is located exclusively in the aortic arch&#44; or the aortic arch is reached after retrograde propagation of a tear located in the descending aorta and does not involve the ascending aorta &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; There are other dissection classifications &#40;DeBakey&#44; Penn&#44; DISSECT&#44; etc&#46;&#41;&#44; but the TEM classification<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> deserves special consideration for its simplicity and usefulness in the clinical assessment of these patients&#46; It considers three essential data&#58; the type of dissection &#8220;type&#8221;&#44; the location of the port of entry &#8220;entry&#8221; and the presence or absence of malperfusion &#8220;malperfusion&#8221;&#46; This last aspect will be key in the treatment and prognosis of these patients&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">By definition&#44; CD is characterised by a separation of the aortic media and an intimal-medial tear&#46; The most common hypothesis holds that the tear&#44; also called the &#8220;entry&#8221;&#44; is the dissection genesis of the tunica media&#46; The inflow of pressurised blood then dissects the media lengthwise and a double lumen aorta is formed&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Thus&#44; in CD we have three differential elements&#58; the intimal-medial flap&#44; two aortic channels &#40;true lumen and false lumen&#41; and a port of entry &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The most common histopathological lesion in CD is degeneration of the media consisting of fragmentation of the elastic fibres and accumulation of mucoid material in the extracellular matrix&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#8211;7</span></a> The aortic wall becomes less compact and a kind of parietal &#8220;aluminosis&#8221; occurs&#44; decreasing its resistance to haemodynamic stress&#46; Degeneration of the tunica media is considered to be the final common pathway in different causes of AAS &#40;hypertension&#44; Marfan syndrome&#44; etc&#46;&#41;&#46; In connective tissue diseases and aortic aneurysms this degeneration is more important than in hypertensive patients&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;5</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">We do not know why a patient ultimately dissects&#46; Hypothetically&#44; a genetic predisposition would favour degeneration of the media which&#44; with or without the influence of cardiovascular risk factors &#40;especially hypertension&#41;&#44; would lead to aortic dilatation&#46; Subsequently&#44; a precipitating factor &#40;hypertension&#44; physical or emotional stress&#44; etc&#46;&#41; would lead to an intimal-medial tear&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">According to its original definition&#44; IMH is a dissection without an intimal-medial tear &#40;no port of entry&#41;&#46; It is therefore a dissection in which the two lumens are not communicating &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; It is an intraparietal haemorrhage contained within the aortic wall and has been attributed to a rhexis of the <span class="elsevierStyleItalic">vasa vasorum</span> that arborise from the adventitia into the media&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;9</span></a> It is likely that many cases of CD and IMH&#44; especially type A&#44; have the same pathogenesis&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> Thus&#44; IMH would actually represent CD with acute thrombosis of the false lumen &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> There is one distinctive feature of IMH&#58; the absence of pressurised flow within the false lumen&#46; This explains the characteristic morphology of this entity on imaging techniques &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41; and its dynamic behaviour&#44; as it can either spontaneously reabsorb or progress to a CD&#46;<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;9</span></a></p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall">Most ulcerated aortic atherosclerotic plaques involve the intima and do not extend into the tunica media&#46; PAU is an atherosclerotic plaque that&#44; after initial erosion and ulceration&#44; ruptures the internal elastic lamina and penetrates the tunica media&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> They are focal lesions that occur within extensive atherosclerosis and are mainly located in the descending aorta &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; They are often accompanied by limited intramural haemorrhage that may spread along the descending aorta&#44; but usually the existing parietal fibrosis and calcification prevent the haemorrhage from progressing lengthwise&#46; PAU may progress to aortic dilatation &#40;saccular aneurysm&#41;&#44; progressive destruction of the media &#40;pseudoaneurysm and rupture&#41; or more rarely to dissection&#46; In the latter case&#44; the port of entry is the excavated area or &#39;crater&#39; of the PAU&#46; The clinical course of these patients is variable&#44; but most are asymptomatic at the time of diagnosis and only a few develop an AAS&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;12&#44;13</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">ID was described by Murray and Edwards in 1973<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a> and refers to those cases of AAS in which there is laceration of the intima and underlying media &#40;intimomedial tear&#41; without significant intramural haematoma<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The base of the lacerated area usually contains a certain proportion of media and adventitia&#46; There is no false lumen as such&#44; and it is accompanied by some degree of subadventitial haematoma causing eccentric protrusion of the aortic wall&#46; It occurs most commonly in the ascending aorta&#44; and it is often accompanied by aortic regurgitation&#46; It can be easily missed without a high index of suspicion&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> In contrast to ID&#44; CD may be referred to as complete aortic dissection&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">A unique feature of these aortic lesions is that they can occur synchronously&#44; i&#46;e&#46;&#44; simultaneously in different aortic segments or&#44; even more often&#44; one after the other in the same aortic segment&#46; Thus&#44; IMH may be the prelude to CD&#44; many cases of PAU are accompanied by some degree of IMH&#44; and&#44; exceptionally&#44; PAU may progress to dissection and an ID to a CD&#46; Any of these lesions can lead to aortic rupture&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Current epidemiology of acute aortic syndrome</span><p id="par0055" class="elsevierStylePara elsevierViewall">Hospital-based studies&#44; retrospective case series and case-control studies underestimate both the incidence and lethality of AAS by not including out-of-hospital deaths&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Recently&#44; large population-based cohort studies have estimated the average annual incidence of CD to be between 6 and 7&#46;2 cases per 100&#44;000 population per year&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">16&#44;17</span></a> The incidence of IMH and PAU is lower than that of CD&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> ID accounts for approximately 5&#37; of all patients with type A AAS&#46; Type A lesions are more common in patients with CD and ID&#44; while type B lesions are more commonly diagnosed in patients with IMH and PAU&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">The incidence of AAS is twice as common in men as in women and increases with age&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">17&#44;18</span></a> The average age of these patients varies according to the type of aortic lesion&#59; it is lower in CD cases &#40;68 years&#41; and higher in PAU cases &#40;77 years&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">18</span></a> Women with CD have a different clinical presentation&#44; arrive later at the hospital&#44; in worse clinical condition than men&#44; and have higher mortality&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">16&#44;17&#44;19</span></a> 30&#8211;50&#37; of patients with type A CD die at home or before reaching the hospital&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">16&#44;17&#44;20</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Analysis of the US national database shows an increase in hospitalisations for CD while hospital mortality &#40;26&#37;&#41; is virtually the same&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Aortic centres&#44; aorta code and aortic pathology teams</span><p id="par0075" class="elsevierStylePara elsevierViewall">The clear relationship between patient volume and surgical outcomes makes it necessary and justifiable to centralise the management of acute aortic disease in &#8216;aortic centres&#8217; &#40;centres with high surgical volume and surgeons with expertise in aortic surgery&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">22&#8211;24</span></a></p><p id="par0080" class="elsevierStylePara elsevierViewall">In this regard&#44; care networks have been set up under the &#34;aorta code&#34; umbrella for the care of patients with AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">24</span></a> They consist of a multidisciplinary team with experience in aortic disease&#44; are available every day at all hours and are activated from the Emergency Departments of the hospitals belonging to the network&#46; The &#8220;aorta code&#8221; seeks to accomplish three things&#58; 1&#41; to increase the level of alertness and awareness of AAS among ED physicians for early detection of patients with AAS&#59; 2&#41; to accelerate the transfer of the patient to the aortic centre of reference&#59; and 3&#41; to provide optimal treatment by activating a highly specialised team&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">At the aortic centre&#44; the aortic team is responsible for quickly determining the best therapeutic strategy for each patient &#40;open surgery&#44; endovascular treatment&#44; hybrid procedures combining open and endovascular surgery&#44; conservative treatment&#41; and for close follow-up&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">Centralising the management of AAS patients in &#8220;few centres and few hands&#8221; offers the best opportunity to improve outcomes&#46;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a></p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Diagnosis of acute aortic syndrome in the emergency department&#46; Three-step diagnostic algorithm</span><p id="par0095" class="elsevierStylePara elsevierViewall">In the emergency department&#44; an accurate diagnosis in the shortest possible time is essential&#46; If in acute coronary syndromes the aphorism &#8220;time is muscle&#8221; has been proposed as a rule of action&#44; here&#44; in AAS&#44; time is even more important&#44; and we could say that &#8220;time is life&#8221;&#46; There are three reasons why detection of the AAS patient in the ED is a diagnostic challenge&#58; the low prevalence of the disease&#44; a variable clinical presentation and the absence of specific biomarkers&#46; Therefore&#44; the risk of error and delay in diagnosis is high and the consequences are significant&#46; To get round this situation&#44; continuous training programmes in emergency departments and the use of a simple diagnostic algorithm are key&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">The latest European Society of Cardiology guidelines on the diagnosis and treatment of aortic disease recommend a confusing and complex diagnostic algorithm&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> Currently&#44; most emergency departments do not follow a specific algorithm for the diagnosis of AAS&#46; Our group proposes the application of a three-step diagnostic algorithm<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">First step</span>&#46; Calculate the a priori probability of having an AAS by considering the three risk categories proposed by the American Society of Cardiology &#40;predisposing conditions&#44; pain characteristics and physical examination findings&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a> In 2011&#44; an aortic dissection risk score was introduced to facilitate detection&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> Each category is assigned a point if a risk marker of that category is present&#46; A score of 0 implies a low risk of AAS&#59; if the score is 1&#44; the risk is intermediate&#59; and if it is &#8805; 2&#44; the risk of having an AAS is high&#46; The pretest probability calculation is a Class I recommendation&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">Among the risk factors&#44; the most common is a history of long-term severe hypertension<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> and&#44; surprisingly&#44; it does not appear in the predisposing conditions of high risk of dissection&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a> Adding this factor increases the sensitivity of the risk score&#46;</p><p id="par0115" class="elsevierStylePara elsevierViewall">It is essential to quickly recognise the so-called &#8220;aortic pain&#8221;&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a> This is a very intense&#44; sharp &#40;stabbing&#41;&#44; tearing&#44; throbbing&#44; pulsating and migratory chest pain&#46; If it radiates to the neck&#44; it indicates that the ascending aorta is affected&#44; whereas if it is located in the back or abdomen&#44; the diseased segment is usually the descending aorta&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Including &#8220;aortic pain&#8221; as a discriminator in the clinical presentation of chest pain in the Manchester triage system or similar classification systems results in early detection of patients with AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> On the other hand&#44; as might be expected&#44; if we are lax with pain characteristics&#44; the specificity of the risk scale decreases&#46; Likewise&#44; a systematic physical examination and the ability to detect high-risk findings will increase the sensitivity of the scale&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">30</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">In short&#44; to correctly assess the a priori probability of having an AAS it is necessary to consider risk factors&#44; pain characteristics and physical examination findings&#46; However&#44; it has been shown that the application of this risk score alone in the emergency department is not sufficient&#46; It has a low specificity and an unacceptable number of false positives&#46;<a class="elsevierStyleCrossRefs" href="#bib0155"><span class="elsevierStyleSup">31&#44;32</span></a></p><p id="par0125" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Second step&#46;</span> After clinical suspicion and physical examination&#44; in-hospital assessment of all patients with chest pain includes an electrocardiogram and a blood test with troponin and D-dimer&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> Elevated blood D-dimer levels have a high sensitivity in the diagnosis of AAS&#44; correlate with the extent of aortic injury and are higher in CD than in IMH&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> The higher the D-dimer levels&#44; the higher the probability that the patient has AAS&#44; especially if it is &#8805; 1600&#8239;ng&#47;ml&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> No less important is its high negative predictive value&#46; That is&#44; normal D-dimer levels virtually rule out the diagnosis of AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> The accuracy of the dissection risk score has been shown to improve when combined with D-dimer levels&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">36</span></a> It should be noted that an elevated D-dimer level does not distinguish between AAS and pulmonary embolism&#44; but it does prompt&#44; in both cases&#44; an urgent chest CT scan that can confirm or exclude both entities&#46;<a class="elsevierStyleCrossRefs" href="#bib0140"><span class="elsevierStyleSup">28&#44;31&#44;37</span></a></p><p id="par0130" class="elsevierStylePara elsevierViewall">Acute coronary syndrome is the most important differential diagnosis in patients with AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">38</span></a> In patients with aortic pain&#44; the combination of a normal ECG&#44; normal troponins and elevated D-dimer levels are a red flag for AAS and makes it unlikely that the patient has an acute coronary syndrome &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> It should be kept in mind&#44; however&#44; that elevated troponin levels do not totally exclude an AAS and a chest CT should not be omitted if D-dimer levels are elevated and the clinical suspicion of AAS is high&#46;</p><p id="par0135" class="elsevierStylePara elsevierViewall">Chest radiography is classically performed in all patients with chest pain and is useful in many cases&#46; It is important to remember that it is often normal in patients with AAS and therefore does not exclude the presence of AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0140" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Third step&#46;</span> Imaging is necessary to reach a definitive diagnosis of AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> CT&#44; which is widely available in emergency departments&#44; is the diagnostic technique of choice<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">39&#44;40</span></a> &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; Any patient with a risk score &#8805; 1 and elevated D-dimer levels should have a CT scan of the aorta &#40;from the neck to the iliofemoral vessels&#41;&#44; especially if troponin levels are normal and there is no change in the electrocardiogram&#46; CT should be performed without contrast&#44; to avoid false negatives in patients with IMH and with contrast&#44;<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">39&#44;40</span></a> and synchronised with the ECG&#44; to avoid false positives due to aortic root motion and ascending aorta&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">A transthoracic echocardiogram &#40;TTE&#41; in the ED may be useful&#44; as it provides information on some relevant aspects&#58; pericardial effusion&#44; ventricular function&#44; aortic regurgitation&#44; etc&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> It is important to bear in mind that a normal TTE does not exclude the diagnosis of AAS&#46; Although transoesophageal echocardiography has excellent diagnostic accuracy in AAS and its complications&#44;<a class="elsevierStyleCrossRefs" href="#bib0215"><span class="elsevierStyleSup">43&#44;44</span></a> we advocate avoiding its routine use in AAS&#44; especially if the patient is unstable&#46; On the other hand&#44; it is very useful in the operating room&#44; especially if we decide to preserve the aortic valve&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;27</span></a> At present&#44; the role of MRI in patients with suspected AAS in the ED is anecdotal&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Differential diagnosis of acute aortic syndrome by computed tomography</span><p id="par0150" class="elsevierStylePara elsevierViewall">Familiarity with the different constituents of the AAS and similar entities is important for the proper interpretation of a CT scan&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;40&#44;41</span></a></p><p id="par0155" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">CD with acute thrombosis versus IMH</span>&#46; In both cases&#44; the two lumens&#44; false and true&#44; are not communicating&#46; When the port of entry of the CD is small and the exit &#40;decompression port&#41; is absent or closed&#44; acute and rapid false lumen thrombosis can occur&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> In these cases&#44; the CT images obtained resemble those of patients with IHM&#46; The distinction between the two entities is not always possible&#44; but by combining axial and sagittal planes we can observe an alteration of the intima contour corresponding to the intimomedial tear of the CD&#46; By definition&#44; there is no such tear in IMH&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;41</span></a></p><p id="par0160" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Aortitis versus IMH</span>&#46; The typical CT image of IMH is a semi-circumferential thickening of the aortic wall with no contrast within the aortic wall and a smooth luminal surface &#40;<a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a>&#41;&#46; In aortitis&#44; the aortic wall thickening is circumferential&#46; Positron emission tomography will be helpful in distinguishing the inflammatory process from IMH&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">45</span></a></p><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0165" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Mural thrombus versus IMH</span>&#46; Dilated aorta can be accompanied by mural thrombosis which in some cases simulates IMH&#46; In contrast to mural thrombosis&#44; hyperdense aortic wall thickening can be seen on non-contrast images &#40;hyperdense crescent sign&#41;&#46; In addition&#44; IMH shifts the calcification of the intima inwards into the aortic lumen whereas&#44; in mural thrombus&#44; the calcifications are usually located along the outer edge of the aortic wall&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">41</span></a></p><p id="par0170" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">PAU versus ulcer-like imaging&#46;</span> PAU and ulcer-like images are not the same entity&#46; The latter are the result of an intimomedial tear and are accompanied by a dissecting intraparietal haematoma&#46; On CT they appear as punch-like areas with extensive communication with the aortic lumen and are not accompanied by alteration of the aortic wall contour&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> They are not accompanied by calcified atherosclerotic lesions and are in fact the port of entry to CD with acute false lumen thrombosis&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> The detection of these lesions is associated with a higher number of aortic events at follow-up &#40;aneurysms&#44; pseudoaneurysms&#44; focal dissections and aortic rupture&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">46</span></a></p><p id="par0175" class="elsevierStylePara elsevierViewall">The typical CT imaging for PAU corresponds to a wide-necked&#44; punch-shaped aortic parietal lesion&#44; which&#44; unlike ulcer-like images&#44; causes remodelling of the parietal contour&#46; It settles around calcified atherosclerotic plaques and is usually accompanied by some degree of IMH&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> Most ulcers are located in the descending aorta and arch&#46;</p><p id="par0180" class="elsevierStylePara elsevierViewall">In summary&#44; the distinction between the different entities is made on the basis of lesion morphology&#44; interface with the aortic lumen&#44; presence of hyperattenuation on non-contrast images&#44; coexistence with atherosclerotic lesions and location of calcification&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Current treatment of acute aortic syndrome</span><p id="par0185" class="elsevierStylePara elsevierViewall">Every patient with AAS should be treated in a Cardiovascular Acute Care Unit with three immediate goals&#58; control of blood pressure &#40;&#8804; 120&#8722;100&#8239;mmHg&#41;&#44; heart rate &#40;&#8804;60 bpm&#41; and pain&#46; For this&#44; we use a combination of intravenous beta-blockers&#44; hypotensive agents and sedatives&#46;</p><p id="par0190" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Type A CD&#46;</span> It is a surgical emergency&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27&#44;47</span></a> The type of intervention depends on the aortic segments involved&#44; the condition of the aortic valve and the clinical condition of the patient&#46; The goals of surgery are to prevent aortic rupture&#44; correct valve regurgitation and resolve any malperfusion&#46; A replacement of the ascending aorta and hemiarch with resuspension of the aortic valve is performed in most patients&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> When the aortic root is severely compromised or in connective tissue diseases &#40;Marfan syndrome&#41;&#44; the usual treatment is replacement of the root and ascending aorta with a composite valve tube&#59; the coronary arteries are reimplanted in the tube&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> This technique&#44; a modified version of the classic Bentall-De Bono procedure&#44; is the standard treatment in type A CD with aortic root involvement&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">48</span></a> If the dissection respects the sinuses of Valsalva&#44; the interposition of a supracoronary tube may be sufficient&#46; Aortic valve preservation techniques are a valid alternative in haemodynamically stable patients with favourable anatomy and in the hands of experienced surgeons&#46;</p><p id="par0195" class="elsevierStylePara elsevierViewall">In order to avoid future reinterventions&#44; some authors recommend total aortic arch replacement in the following situations&#58; significant arch dilatation&#44; extensive arch tears and dissection of the supra-aortic trunks&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">49</span></a> The &#8216;elephant trunk&#8217; technique using hybrid prostheses allows total repair of the arch and the proximal segment of the descending aorta while closing the port of re-entry&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">50</span></a></p><p id="par0200" class="elsevierStylePara elsevierViewall">An individualised therapeutic approach should be taken based on the surgeon&#39;s experience&#44; extent of the lesion&#44; haemodynamic status and clinical profile of the patient&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">51</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Type B CD</span>&#46; Medical treatment remains the treatment of choice for uncomplicated type B CD&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a> The indicated treatment in complicated type B CD is thoracic endovascular aneurysm repair &#40;TEVAR&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a> The main complications of type B CD are listed in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46; TEVAR may be considered to prevent future aortic complications in some patients with uncomplicated type B CD&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27&#44;52</span></a> Regarding Marfan syndrome&#44; whether TEVAR is more appropriate than open surgery is still under discussion&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">53</span></a> The latter is a good alternative when endovascular treatment fails or is contraindicated&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;47&#44;54</span></a></p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0210" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Non-A&#44; non-B type CD&#46;</span> Treatment must be individualised&#46; The port of entry is usually in the arch in half of the cases and in the descending aorta in the other half&#46;<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">55</span></a> Endovascular techniques&#44; open surgery &#40;elephant trunk&#41; or hybrid aortic repair offer good results&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">22&#44;56</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Incomplete dissection&#46;</span> If the lesion involves the ascending aorta it is treated as a type A CD&#58; emergent surgery&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Type A IMH&#46;</span> The optimal treatment of these patients is not well established&#46; European and American clinical practice guidelines recommend emergency surgery&#44;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a> while Asian guidelines only recommend surgery if the clinical course is poor&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">57</span></a> It is true that mortality in patients with type A IMH is lower than in those with type A CD and that complications such as aortic regurgitation&#44; tamponade and malperfusion syndromes are less common in patients with type A CD&#46;<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">58</span></a> Our group advocates initial medical treatment in patients without poor outcome indicators &#40;aortic diameter&#8239;&#60;&#8239;50&#8239;mm and absence of intimomedial tears&#41; and haemodynamically stable&#44; especially if they are elderly and have comorbidities&#46; The rest require urgent surgery &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0225" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Type B IMH&#46;</span> Initial treatment is medical&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a> Close follow-up with CT scan and D-dimer levels is important&#46;<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3&#44;59</span></a> If complications occur&#44; the treatment of choice is TEVAR&#46;<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">59</span></a> The presence of intimomedial tears is associated with a higher rate of aortic complications&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0230" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleItalic">Penetrating aortic ulcer&#46;</span> Treatment is similar to that of type B IMH&#46; In symptomatic patients or those with large or complicated ulcers&#44; treatment with TEVAR should be considered&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#44;47</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Prevention of acute aortic syndrome</span><p id="par0235" class="elsevierStylePara elsevierViewall">Measures to prevent the onset of AAS can be summarised in four points&#58; a thorough family medical history&#44; preventive surgery&#44; control of high blood pressure and pharmacological treatment&#46;</p><p id="par0240" class="elsevierStylePara elsevierViewall">A family history of aortic dissection and aortic aneurysm are risk factors for AAS&#46;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> Periodic monitoring with imaging techniques and genetic testing is advisable in individuals with a family history of AAS or aortic aneurysm&#46; In patients with aortic aneurysm&#44; clinical practice guidelines recommend aortic repair depending on the diameter of the aneurysm &#40;&#62;50&#8722;55&#8239;mm&#41;&#44; the rate of progression of aortic dilatation&#44; the presence of other risk factors and the clinical profile of the patient&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#44;27</span></a></p><p id="par0245" class="elsevierStylePara elsevierViewall">Aortic wall &#8216;stabilising&#8217; treatments such as beta-blockers and angiotensin II receptor antagonists should be used early in order to prevent aneurysm progression&#46; However&#44; the use of these drugs in patients without connective tissue disorders has not been shown to decrease the likelihood of developing an AAS&#46;</p><p id="par0250" class="elsevierStylePara elsevierViewall">Hypertension is an independent predictor of type A CD&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">29</span></a> Therefore&#44; careful control of blood pressure is essential&#46;</p><p id="par0255" class="elsevierStylePara elsevierViewall">Population-based cohort studies have shown that the use of fluoroquinolones is associated with an increased risk of CD and aortic aneurysm&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> In addition&#44; patients with aortic aneurysm have more complications if treated with this type of antibiotics&#46;<a class="elsevierStyleCrossRef" href="#bib0300"><span class="elsevierStyleSup">60</span></a> Therefore&#44; fluoroquinolones should not be used in these patients whenever a therapeutic alternative is available&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Final considerations</span><p id="par0260" class="elsevierStylePara elsevierViewall">Progress has been made in the diagnosis and treatment of patients with AAS over the past two decades&#44; but many challenges remain&#46; To mention a few&#44; it is essential to find specific AAS biomarkers for early diagnosis&#44; to promote the creation of aortic centres and aorta codes&#44; to expand the intravascular therapeutic offer for patients with type A AAS and high surgical risk&#44; and to conduct multicentre clinical trials to test the efficacy of preventive interventions&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Funding</span><p id="par0265" class="elsevierStylePara elsevierViewall">None&#46;</p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Conflict of interest</span><p id="par0270" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "titulo" => "Introduction"
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          "titulo" => "Components of acute aortic syndrome&#46; Definition&#44; pathophysiology and classifications"
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          "titulo" => "Current epidemiology of acute aortic syndrome"
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          "titulo" => "Aortic centres&#44; aorta code and aortic pathology teams"
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          "titulo" => "Diagnosis of acute aortic syndrome in the emergency department&#46; Three-step diagnostic algorithm"
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          "titulo" => "Differential diagnosis of acute aortic syndrome by computed tomography"
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          "titulo" => "Current treatment of acute aortic syndrome"
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          "titulo" => "Prevention of acute aortic syndrome"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Acute aortic syndrome embraces a group of heterogenous pathological entities involving the aortic wall with a common clinical profile&#46; The current epidemiology&#44; clinical presentation&#44; diagnosis and treatment strategy are discussed in this review&#46; Besides&#44; the importance of multidisciplinary aortic teams&#44; aortic centres and the implementation of an aortic code are emphasized&#46;</p></span>"
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        "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">El s&#237;ndrome a&#243;rtico agudo agrupa distintas entidades que afectan a la pared a&#243;rtica y que tienen una presentaci&#243;n cl&#237;nica com&#250;n&#46; En esta revisi&#243;n se exponen aspectos relevantes sobre su epidemiolog&#237;a&#44; presentaci&#243;n cl&#237;nica&#44; diagn&#243;stico y estrategias de tratamiento&#46; Adem&#225;s&#44; se analiza la importancia de los equipos multidisciplinares y los centros de aorta en la atenci&#243;n y el pron&#243;stico de los pacientes con s&#237;ndrome a&#243;rtico agudo&#46;</p></span>"
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Complications of type B classical dissection&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">- Pleural effusion&#8239;&#8805;&#8239;moderate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">- Periaortic haematoma&#47;radiological signs of impending rupture&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">- Haemodynamic instability &#40;hypotension-shock&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">- Refractory pain&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">- Malperfusion syndrome&nbsp;\t\t\t\t\t\t\n
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                    0 => array:2 [
                      "titulo" => "Acute aortic syndrome"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "I&#46; Vilacosta"
                            1 => "J&#46;A&#46; San Rom&#225;n"
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                      "doi" => "10.1136/heart.85.4.365"
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                        "tituloSerie" => "Heart"
                        "fecha" => "2001"
                        "volumen" => "85"
                        "paginaInicial" => "365"
                        "paginaFinal" => "368"
                        "link" => array:1 [
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                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/11250953"
                            "web" => "Medline"
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                ]
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                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Acute aortic syndrome&#58; a new look at an old conundrum"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:6 [
                            0 => "I&#46; Vilacosta"
                            1 => "P&#46; Aragoncillo"
                            2 => "V&#46; Ca&#241;adas"
                            3 => "J&#46;A&#46; San Rom&#225;n"
                            4 => "J&#46; Ferreir&#243;s"
                            5 => "E&#46; Rodr&#237;guez"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1136/hrt.2008.153650"
                      "Revista" => array:6 [
                        "tituloSerie" => "Heart"
                        "fecha" => "2009"
                        "volumen" => "95"
                        "paginaInicial" => "1130"
                        "paginaFinal" => "1139"
                        "link" => array:1 [
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Original language: English
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es en pt

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