Behcet's Disease: New Concepts in Cardiovascular Involvements and Future Direction for Treatment

Owlia, M. B.; Mehrpoor, G.

doi:https://doi.org/10.5402/2012/760484

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Volume 2012 | Article ID 760484 | https://doi.org/10.5402/2012/760484

Behcet's Disease: New Concepts in Cardiovascular Involvements and Future Direction for Treatment

M. B. Owlia¹and G. Mehrpoor¹

Academic Editor: S. Ceruti, R. Fantozzi

Received17 Nov 2011

Accepted15 Dec 2011

Published08 Mar 2012

Abstract

Behcet’s disease (BD) is the only systemic vasculitis involving both arteries and vein in any sizes. It frequently encounters in rheumatology clinics. It has some major morbidities and even fatal outcomes in some cases. The aim of this paper is to analyze the main concepts on pathophysiology and treatment options in BD, focusing on cardiovascular aspects, thrombosis, and potential future treatment.

1. Introduction

Behcet’s disease (BD) is a chronic, relapsing multisystem autoinflammatory condition. It clinically diagnoses with recurrent oral and/or genital aphthosis, mucocutaneous lesions, central nervous system manifestation, and ocular, vascular, articular, gastrointestinal, and inflammatory eye lesions. Autoinflammatory conditions are a group of heritable inflammatory-mediated conditions characterized by idiopathic attacks of systemic inflammation with lack of known-specific antigens and antibodies or immune response [1]. These conditions share in some clinical aspects including uveitis, fever, arthritis, and mucocutanous lesions as seen in hyperimmunoglobulinemia D syndrome, periodic fever syndrome (HIDS), familial Mediterranean fever (FMF), and tumor necrosis factor receptor-associated fever syndrome (TRAPS).

Both genders at the third and fourth decade of life can be affected [2, 3]. Different prevalences of BD are reported. The highest prevalence was reported in Turkey (40–370 per 100000) [4], while this was 80 per 100000 in Iran [5] and 7 to 8.5 per 100000 in Japan. By contrast, the disease is less common in North America, Northern Europe, USA, UK, and Germany (0.12 to 0.64) [6].

Vascular involvement has been reported in 7.7 to 38% of BD cases, with mortality of about 20% in severe cases. Despite lower sensitivity of this manifestation in BD, its higher specificity with respect to eye and skin involvement merits special consideration for Behcetologists. Venous thrombosis could be as the initial presentation of BD [7]. Both veins and arteries with any size can be affected. Most authors believed that venous manifestation is more common in BD. According to Hamza classification there are five types of vascular involvement in BD (Table 1). Early recognition of vascular lesions is important because it seriously affects BD prognosis. The leading cause of sudden death in patients with BD is usually ruptured of a large aortic or arterial aneurysm [8].

We performed a comprehensive search through MEDLINE, Web of Science, Scopus, and Google Scholar for recently published articles, using the following keywords: Behcet’s disease, Behcet’s syndrome, cardiovascular, thrombosis, aneurysm, pseudoaneurysm, deep vein thrombosis, embolism, heart, vessel, biological therapy, thrombophilia, infliximab, etanercept, rituximab, atherosclerosis, platelet, and aspirin. Most of reviewed articles were from 2000–2011. We emphasized on studies with higher evidence levels and larger sample size cohorts.

The aim of this study is to review the main new concepts on pathophysiology, clinical manifestation, and current and potential future treatment in cardiovascular BD.

2. Cardiovascular Etiopathogenesis and Pathology

The real etiopathogenesis of BD is not well understood [9]. As in most autoinflammatory and autoimmune conditions, genetic predisposition and environmental factors may play some role in pathophysiology of BD. HLA-B51expression is believed to be associated with more severe disease in several studies and is related to familial BD [10]. In various studies from Iran, Tunisia, Turkey, Israel, France, and Canada, it was shown that (tumor necrosis factor) TNF-alpha-1031C allele and polymorphism in IL-21, 10, and 8 genes are related to pathogenesis of BD [11–17]. The role of IL-23/IL-17 axis is recently introduced in inducing BD [18, 19].

Delayed-type hypersensitivity to infections such as streptococcus species (especially sanguis) are supposed in part by some authors to be an important factor in inducing BD [20]. These bacterial antigens along with heat shock protein (HSP) 60/65 kDa activate T cells to promote inflammatory response in BD [9, 21]. Besides from antiinflammatory activities of antibiotics, favorable response of joint, and mucucutaneous manifestations of BD to benzathine penicillin may potentiate the hypothesis of some role for infection [22–24].

Coagulation abnormalities and platelet overactivity may have some additional role on endothelial damage, inflammation and vascular pathologies in BD (Figure 1) [25–27]. Increased levels of nitric oxide (NO) after induction by Interferon-gamma are seen in active BD [28]. In addition, hypovitaminosis D was shown to be related to immune aberrancy leading to BD [29].

It has been postulated that platelet-neutrophils complexes (PNC) can play an important role in thrombosis-inflammation which is seen in some critical vascular events including BD [30–35]. Also it has been shown that inhibition of PNC formation led to marked reduction in pulmonary injuries and improved pulmonary function [33]. Köhler et al. found that PNC formation facilitates transendothelial movement of platelets involving in process of thrombosis inflammation in vitro and in vivo.

Elevation in some markers of endothelial dysfunction (thrombomodulin and adhesion molecules) and low-grade inflammation (proinflammatory cytokines, C-reactive protein, and serum amyloid A) disclose their important role in pathophysiology of most immune-mediated cardiovascular events in BD [36].

Impaired hypothalamus-pituitary-adrenal (HPA) axis which is an important background in most autoimmune disease may be involved in etiopathogenesis of BD, while this issue has been less addressed in the literatures. The main reason for this is due to the fact that frequently symptoms of patients will appear after a major or even minor emotional stresses. This incompetent HPA axis may lead to overexpression of proinflammatory cytokines definitely involved in pathogenesis of BD.

The precise pathogenetic mechanism of prothrombotic state in BD is unknown. It seems that thrombophilic factors could contribute to thrombosis in BD. In addition, similar to the other disorders with increased risk of thrombosis formation, there is endothelial cell injury and hypercoagulable state in BD. Endothelial dysfunction due to antiendothelial cell antibodies and elevated plasma Vascular Endothelial Growth Factor (VEGF) levels lead to microcirculation disturbance and increased blood viscosity and abnormal blood flow [37–39]. Furthermore, selectins, a group of adhesion molecules consist of P and E-selectins that mediate leukocyte adhesion to platelets and endothelium and have a role in thrombogenesis. E-selectin is expressed by activated endothelial cells and P-selectin is synthesized and stored in platelets and endothelial cells. Increased P and E-selectin level in BD was reported in some studies [40–44].

In addition, it has been reported that factor V Leiden [45–48] may be a factor in the development of thrombotic events in BD. Also other factors which may play some role in the hypercoagulability are protein C or protein S deficiency [49, 50], impaired fibrinolytic activity, increased homocysteine levels [51, 52], decreased thrombomodulin [53], elevated Lipoprotein (a) [54, 55], platelet hyperactivity, high von Willebrand factor antigen, and the presence of antiphospholipid antibodies [56–58]. Dyslipidaemia and predominantly hypertriglyceridemia might also be risk factors. Besides inherent factors inducing thrombophilia in BD; vasculitis and vessel wall inflammations are the other more important factors. Vasculitis can lead to the enhancement of platelet aggregation, and an impairment of fibrinolysis resulting in thrombosis [59].

It is well known that platelet is one of the most important components in hemostasis. Following endothelial injury, the first step in thrombosis, formation is the platelet adherence, aggregation and activation. Increased Mean Platelet Volume (MPV), a marker of platelet function, is associated with thrombosis in BD [60, 61]. Increased aggregation of platelet in vitro in response to adenosine diphosphate (ADP) and collagen is reported [62].

Cardiovascular pathology in BD represents a unique spectrum of inflammation, thrombosis and aneurysm. It seems that vasculitis is cornerstone of cardiovascular manifestation in BD. Necrotizing leukocytoclastic or polymorphonuclear (PMN), obliterative perivasculitis and lymphoplasma cell infiltration of capillaries, veins, and arteries, and vasa vasorum (and not vasa nervorum) are the main pathologic features in affected tissues. Infiltration of PMNs is a distinctive pathologic feature of BD addressing to therapeutic role of PMN inhibiting agents such as colchicines and dapson. Vascular wall destruction due to inflammatory cell infiltration leads to arterial wall weakening and aneurysmal dilatation. In pseudoaneurysm all layers of intima, media, and adventitia are not involved as seen in aneurysmal lesion (Figure 2). Although accelerated atherosclerosis is a major contributor to cardiovascular events in most autoimmune disorders like systemic lupus erythematous and rheumatoid arthritis [63], several studies showed that atherosclerosis is characteristically not increased in BD [64, 65]. Despite nonincreased incidence of overt atherosclerosis in BD, intima/media thickness (IMT) is shown to be increased in some studies that may be due to nonatherosclerotic causes of endothelial hyperactivity [66].

(a)

(b)

3. Cardiac Manifestations

Cardiac involvement is among the most life-threatening complications in BD. They include pericarditis, coronary artery stenosis or aneurysm, myocarditis, cardiomyopathy, congestive heart failure, valvular pathology, endocarditis, intracardiac thrombosis, and aneurysm of aorta or its branches [67].

The incidence and nature of the cardiovascular involvement in BD are not yet clearly documented [68]. Heart involvement with frank clinical presentation is rare in BD [67]. It was reported 1%–5% in a case series while it was 16.5% in a registry of Behçet autopsy cases in Japan [69, 70]. Mortality of this complication is relatively high (around 20%). In addition cardiac involvement in BD can be seen frequently without symptoms [71].

Pericarditis is the most common type of heart involvement. Acute pericarditis, tamponade, constrictive pericarditis, and even only pericardial effusion without any symptom have been reported [72–75].

Coronary artery disease (CAD) is rare in BD. It is more common in male younger than 40 years old. The incidence of coronary artery aneurysm is 1.5% to 5% [76]. CAD can lead to clinical manifestation such as myocardial infarction, silent ischemia, and stable or unstable angina. Aneurysm, stenosis, occlusion, and arteritis are the most common etiologies for CAD in BD [77]. Coronary aneurysms are more frequent than the stenosis and can present as acute coronary syndrome and myocardial infarction, but sometimes are symptomatic [78]. Coronary occlusion is attributed to fibrous intimal thickening as a result of local vasculitis [79]. Conventional coronary angiography is the procedure of choice for diagnosis of coronary artery aneurysms. Two forms of aneurysm can be detected by angiography: saccular and fusiform. In general population, acute myocardial infarction (AMI) is always associated with atherosclerotic coronary artery disease. In young adults with myocardial infarction, nonatherosclerotic etiologies such as embolization, trauma, arteritis, spasm, dissection, and congenital abnormalities should be considered. However, in BD, coronary arteritis has been supposed as an independent pathophysiological mechanism for AMI. Coronary arteritis may lead to myocardial infarction, but in some of patients with MI, coronary artery is normal. It seems that severe BD cases are to be more prone to AMI. It was shown that occlusion is developed as a result of thrombosis formation in CAD, consequently producing AMI [80]. Understanding the etiology of AMI in BD may be important for determination of best treatment strategy. Silent myocardial infarction (SMI) has also been reported in BD [81, 82]. The etiology of SMI is not clear, although autonomic nervous dysfunction has been suggested as an etiology. Güllü et al. [82] and Türkölmez et al. [81] reported high prevalence of SMI on their studies (25% and 19.5% among 36 and 41 patients, resp.). Myocardial perfusion scintigraphy was recommended by Türkölmez et al. in patients with long lasted BD for screening of SMI.

A few cases with intracardiac thrombus which often preceding other manifestations of BD have been reported [83]. These thrombi, found mainly in the right ventricle, are often associated with pulmonary artery aneurysm [84]. The reason for predilection to involve right ventricular is still unclear. However, both ventricular involvements have also been reported [85]. Based on autopsy findings, it looks that endomyocardial fibrosis plays a role in the intracardiac thrombus development in some patients [86], but it is not clear whether they are secondary to underlying endocarditis or endomyocardial fibrosis, because in some case reports, a normal underlying myocardium was described [87]. Due to high specificity of right heart thrombus in BD, in any patient with this finding, diagnosis of BD should be considered [86, 88, 89]. Intracardiac thrombus is the major differential diagnosis when a young patient presents with an intracardiac mass [90]. This makes enormous diagnosis of cardiac myxoma in some instances [91]. It is especially common in young adults BD patients in Middle East [68]. It is difficult to specify the mechanism of intracardiac thrombi formation. Good prognosis has been reported contrary to several recurrences of thrombosis [68]. Intracardiac thrombus can lead to superior vena cava syndrome [90, 92, 93] and pulmonary embolism [83, 94–96].

Endocardial involvement may present with mitral and aortic valve prolapse, mitral or aortic insufficiency, aneurysm of sinus Valsalva, and endocarditis mimicking bacterial endocarditis [67, 97, 98]. The Fibrosis secondary to endocardial involvement in BD may predispose to intracardiac thrombus formation [99]. It was reported that valvular prolapse including mitral valve prolapse can be related to vasculitis and tissue derangement [97]. Most of the aneurysm of the sinus Valsalva has been found in right coronary sinus which project into the right atrium or ventricle. Usually the problem is diagnosed after rupture of aneurysm. A few cases of sinus Valsalva aneurysm in BD have been reported. Usually they occurred in active phase of BD and were enlarging progressively. Heart failure due to ruptured aneurysm requires urgent surgical repair.

Conductive abnormalities were also reported in several papers in the past [100, 101] that they could directly be attributable or even nonrelated to BD per se.

4. Thrombosis

Thrombosis is one of the most common and important features in BD with prevalence ranging 10–30% in different studies [102–107]. It was more common in males [102]. In most case series, fever is frequently found in vascular thrombosis along with constitutional symptoms and high acute phase response [108]. Deep vein thrombosis of the lower extremities is the most frequent site for thrombosis in BD (60–80% of vascular lesion) [103, 109]. Superficial thrombophlebitis is the next common lesion in BD which may occur after venipuncture. This thrombosis has been described at any sites such as cerebral sinuses, intracardiac, renal, ulnar, subclavian, hepatic (Budd-Chiari syndrome) or portal veins, and vena cava [110]. Budd-Chiari syndrome and vena cava thrombosis are associated with increased mortality. One of important clinical entities in vasculo-BD is “venous claudication” due to iliac and/or femoral vein thrombosis [111].

Classic vessel-related lesions in central nervous system (CNS) are related to thrombosis, aneurysms, and frank vasculitis [112]. Both arteries (ischemic and embolic stroke-like picture) and veins (dural sinus thrombosis) are vulnerable in BD. Arterial embolism is also observed in BD secondary to intracardiac thrombosis formation [113]. Most authors believe that venous thrombosis in BD could not result in embolism [114]. In addition, cerebral venous thrombosis (CVT) is a serious manifestation of BD. It was reported that CVT represents 7–30% of all CNS lesions of BD in different studies [115–119]. Frequently CVT is seen in a young male patient approximately 5 years after initiation of BD. However, CVT might be the presenting feature in up to 20% of patients and could be subacute or chronic. Persistent headache, papilledema, nausea, vomiting, and focal deficits are the main complaint among the patients. In 60% of cases, superior sagittal sinus and transverse sinus are the most common sites of CVT (Figure 3) [120]. The important complication of CVT is severe visual loss. Association between major vessel disorders and CVT has also been described [121]. While parenchymal lesions in CNS are categorized as a nonvascular lesions, but even parenchymal lesions are resulted from some microvascular events [113].

5. Aneurysm

Arterial pathology in BD divided into two categories: occlusive or aneurysmal lesion. Although it has been reported that venous involvement is the most common vasculo-Behcet complication but Jamoussi reported that arterial involvement is more frequently seen than the venous complication [122]. The most severe complication is aneurysm formation and rupture. Abdominal aorta is the common site of aneurysm and approximately 60% of reported arterial lesions associated with BD is aneurysms [123]. Aorta is among the most common affected arteries followed by the pulmonary artery. In thoracoabdominal aorta, the abdominal aorta shows more frequent aneurysm development than the thoracic aorta. Unusual aneurysms and pseudoaneurysms like ulnar, celiac, subclavian, left anterior descending, tibioperoneal, iliac, and superior mesenteric artery aneurysm were reported as rare manifestations of BD [124–129].

Pulmonary artery aneurysm (PAA) with an associated rate of 1%–10% of patients in BD is the most common pulmonary lesion [130]. Yekeler and Goueffic believed that BD is the only vasculitis which could be associated with PAA. PAA is usually occurred in main pulmonary arteries. Perihilar or parenchymal opacities can be seen on chest radiographs; however, these radiographic features are not specific and pathognomonic. Ruptured PAA and fatal hemoptysis lead to poor prognosis.

Occurrence of PAA along with deep vein thrombosis is defined as Hughes-Stovin syndrome (HSS), which may be a variant of BD. Less than 40 published cases of HSS have been described. Infections and angiodysplasia are possible causes in etiopathogenesis of HSS. The patients usually present with cough, dyspnea, fever, chest pain, and hemoptysis. Overall, patients with HSS have a poor prognosis. Early diagnosis and treatment may associate with better prognosis.

The occurrence of intracranial aneurysm in BD is very rare (e.g., only one case in 316 and 119 patients was reported in Benamour [131] and Al-Dalaan [106] studies, resp.). Middle cerebral artery is the most common affected vessel and subarachnoid hemorrhage is the most presenting manifestation secondary to aneurysm rupture. Association of extracranial and intracranial aneurysm was reported in several BD cases, also multiplicity almost always is seen in vasculo-Behcet; thus more investigation in a patient with extracranial aneurysm is recommended. The prognosis of aneurysm has been differed due to severity of the hemorrhage and BD activity.

The clinical presentation of aneurysm depends on disease stage and anatomic location of lesion. Most of the time, aortic aneurysms show rapid progression to rupture, and as a result, huge retroperitoneal hematoma or hemoperitoneum is developed as initial manifestations. Aortic aneurysms are often a pseudoaneurysm and usually originate from defects located in the posterior or lateral walls of normally sized aorta and then extend into the adjacent retroperitoneal space.

Angiography is the best method in diagnosis of aneurysm and pseudoanurysm, but in BD the risk of new aneurysm formation is high. Therefore noninvasive methods such as digital subtraction angiography, contrast-enhanced tomography and magnetic resonance angiography are the other methods which have been used safely.

The pathogenesis of aneurysm in BD differs from those of atherosclerotic aneurysms. Vasculitis in BD leads to destruction of the media, arterial dilatation and fibrosis. Inflammatory obliteration of the vasa vasorum and consequent transmural necrosis may develop a pseudoanurysm or rupture an arterial wall.

An important characteristic of aneurysm in BD is predilection for the recurrence, which can occur in different locations.

Matrix metalloproteinase proteins (MMP) which play an important role in tissue remodeling and destruction of extracellular matrix components are thought to have significant role in aneurysm formation. Pay et al. reported that serum level of MMP-9 and MMP-2 are important marker in vasculo-Behcet [132].

6. Treatment

6.1. General Considerations

Behcet’s disease is a condition without known-specific etiology and evidence that supports the immunologic basis it. Some evidence addresses infectious trigger for it. Therefore, cornerstone of medical management is manipulation of immune system and administering agents against some putative microorganisms and finally surgical intervention in case of vascular complications.

Managing vascular events in BD is debating [133] and very important to all clinical disciplines including vascular rheumatology, cardiovascular medicine, vascular surgery, general internal medicine, general and interventional radiology, and also thrombologists. Due to early diagnosis, aggressive treatments and new techniques of vascular surgery, the prognosis of large vessel involvement in BD is improving [134].

Few double blind controlled trials were presented, denoting BD treatment. Most trials with new drugs are as case reports or small case series. The newest EULAR recommendations deal with emerging advances in management of BD. Treatment plan is generally based on the symptom(s), the organ involved, and severity of conditions that should be tailored individually [135].

As mentioned earlier, BD is a multifeature condition. In the next part, we emphasize on management of highly morbid events or life threatening vascular BD.

6.2. Antiinflammatory and Cytotoxic Agents

6.2.1. Glucocorticoids (GCs)

They are the pillar of management in any organ involvement in autoinflammatory and autoimmune disease; therefore corticosteroids are administered for years in almost any organ involvement in BD with dramatic response in most cases. Liberal use of corticosteroids in 1950s led to severe and widespread adverse reactions. So strategies to minimizing these side effects have been suggested then after. Administering the “minimum effective dose” (not traditional textbook based doses) tailored for each individual patient could be rational in handling with corticosteroids.

6.2.2. Azathioprine

One of the agents most studied in randomized controlled trials [136] and nonrandomized trials in BD is azathioprine [137–139] and almost all of them reported good clinical response with negligible adverse effects. It does not mean that this agent is the utopian agent in BD. Our anecdotal reports from Iran do not match with this evidence. Despite EULAR recommendations conducted by Hatemi et al. denoting use of azathioprine in neurologic involvement in BD, we hardly use this agent in major neurologic manifestations in our center (and also in Iran) due to uncertainty or lack of clinical benefit and cytopenia in tolerable doses in our practice.

6.2.3. Cyclophosphamide

It is the first line cytotoxic agent in life threatening vascular events in BD. The EULAR recommended this agent in both arterial (aneurysm) and venous (thrombosis) involvement in central or peripheral vascular bed. Its side effects of leukopenia, hair loss, and anorexia are reported to be nonsignificant.

6.2.4. Colchicine

The other most common systemic agent used in BD iscolchicine. The mechanism of action for colchicine is not fully understood, but it is shown that the drug accumulates mostly in neutrophils and interferes with microtubule assembly. Dosage adjustment in patients with hepatic and or renal dysfunction is mandatory. Colchicine is believed to not only prevent and treat oral and genital aphthi and uveitis but also is used to prevent recurring intracardiac thrombus in BD. Similarly it is used for some other autoinflammatory conditions like FMF, pyoderma gangrenosum, and other PMN-mediated conditions like Sweet’s syndrome [140]. Therefore colchicine should be considered as a safe systemic disease modifying antirheumatic drug (DMARD) in any patient with potentially active BD. Alternatively, considering infiltration of neutrophils in affected vessel wall, doxycycline, a matrix metaloproteinase inhibitor was used in a 2 weeks period after surgery of abdominal aortic aneurysm with better results than placebo [141].

6.2.5. Cyclosporine A

This agent with inhibition of IL-2 and IL-17 is a powerful drug in controlling BD. Most studies are focused on eye (uveitis rather retinal vasculitis) in BD. Thalidomide, an old drug which discovered in 1950s, revisited in recent years as a good antiinflammatory in conditions like aphthous ulcerations, HIV-associated cachexia, inflammatory bowel diseases, and mucocutaneous and intestinal BD with mechanism of inhibitions of angiogenesis and TNF-alpha [142, 143].

6.3. Anticoagulation and Antiplatelet Agents

As all clinicians know, standard of care in deep vein thrombosis is anticoagulation in almost all cases. Even there are some indications to thrombolytic therapy in some selected cases of DVTs. The challenging issue is holding anticoagulation in setting of BD complicated with DVT due to lack of risk of embolic events as supposed by Caspary [144]. We emphasize that this notion is based on category IV evidence of expert opinions. The authors of this review believe that inflammation is an additional feature of BD complicated with thrombosis. Presence of several thrombophilia states in BD [25, 58, 145, 146] may offset in part the theory of adhering clot to highly inflammatory veins with no risk of embolisation. In our interdisciplinary discussion, we argued about cases in whom repeated attacks of DVT may precede months or years before full-picture BD and despite the same story for pathophysiology of DVT in these cases, it seems not to prudent withholding anticoagulation in these cases. In addition, we believe any mentioned and well-accepted risk of major bleeding in routine anticoagulation therapies (about 7%) may be due to any underlying occult vascular pathologies such as hidden aneurysms or vascular disintegrities like subclinical BD. Saadoun et al. showed that anticoagulation is not only an effective but also a safe treatment in cerebral venous thrombosis [115]. It seems that thrombophilia in BD is a sophisticated process of intervening inherent or hereditary condition, endothelial hyperactivity, and low-grade inflammation [110]. Therefore, it is better to just recommend management of DVT in BD to be accomplished by highly expert physicians and not to discourage anticoagulation [147, 148] even in pediatric BD except for pulmonary arterial involvement [149]. Some authors limit control of inflammation for the purpose of prevention of thrombosis rather than treatment of it and handling complicated cases of cerebral sinus, vein and pulmonary vein thrombosis is based on per-case decision made by a multidisciplinary therapeutic team sometimes necessitating more aggressive treatments such as local thrombolysis or surgical interventions.

Regarding Intracardiac thrombus, some authors experienced successful thrombolytic therapy in the case of recurrent right ventricular thrombosis [150, 151]. Khammar and some other authors suggested colchicine, anticoagulant therapy, and corticosteroids for intracardiac thrombosis in BD [84, 152].

6.4. Neurovascular BD

In the case of neurovascular BD treatment, (in contrary to eye, joint and mucocutaneous studies with level Ib evidence) there is no high-quality controlled trials and almost all studies are case-control or comparative (level III) [114].

Benign vascular headache in BD is managed conservatively as usual migraine [153]. In CVT, some authors use anticoagulants along with short course glucocorticoids and the others manage it as other parenchymal brain disease in BD. In the newest recommendation, EULAR did not address separately to CVT regarding anticoagulation usage but recommended corticosteroids in dural sinus thrombosis. It has also been emphasized that in CNS BD, cyclosporine A should be withheld except in patients with concomitant eye involvement. This is due to neurotoxicities of cyclosporine in several reports. Vascular CNS aneurysms are managed as in other locations.

6.5. Role of Surgery in Management of BD

Surgical repair is the standard care in cases of organ threatening aneurysmal dilatation, stenosis, or obstruction of clinically significant arteries. In some cases, ligation of affected vessel (mostly peripheral ones) is mandatory even in the cases of pulmonary artery [154, 155]. Endovascular approach is a minimally invasive technique for aneurysm repair and is growingly advised by some authors [125, 134, 156]. In BD, this technique has less complications and better results comparing to atherosclerotic lesions [157]. Endarterectomy was performed in rare incidence of bilateral common carotid artery occlusion and chronic thromboembolic pulmonary hypertension secondary to BD [158, 159]. Other approach to some kinds of aneurysms is percutaneous embolization of individual aneurysm using substances like n-butyl cyanoacrylate [160]. The most frequently encountered postoperative complication was anastomotic pseudoaneurysm [125, 161]. Percutaneous transluminal stent angioplasty was successfully used by Han et al. in BD complicated with Budd-Chiari syndrome [162]. This is important to mention that systemic (and/or local) inflammation should be controlled before any elective surgical intervention. Liu et al. used medical therapy after vascular surgery with similar good results [163]. Conventional immunosuppressive drugs are frequently used as premedication to operative surgery [164].

6.6. Biologic Agents

Biologic agents are emerged in recent decades and are targeted drugs against specific mediators of inflammations. In general, biologic agents are the second choice in cases of BD refractory to conventional immunosuppression [165]. In one study, Baki et al. used infliximab de novo without preceding glucocorticoids and cyclophosphamide in a man with PAA and reported complete remission in two years [166].

The most popular biologic agents are agents against TNF-alpha (infliximab, etanercept and adalimumab), B-cell depleting agents (rituximab), and specific monoclonal antibodies to interleukin (IL)-1 (anakinra), IL-6. Most of studies on infliximab deal with inflammatory eye disease in BD. Considering the role of TNF-alpha in triggering prothrombotic adhesion molecules, using TNF blocking agents could be theoretically of some interest in vasculo-BD. Infliximab was used in two cases of PAA (with intracardiac thrombosis), one case with femoral profunda artery aneurysm and two cases with magic syndrome with more than a year of complete remission [166–168]. Employing TNF (and probably other biological agents) in thrombosis of BD was disappointing with especial regard to potential prothrombotic activities and predisposition to frequent autoantibody formation (notably anticardiolipin) of these agents [169].

Infliximab was used in several studies as an agent to improve endothelia dysfunction and suppress low-grade inflammation in the major cases of cardiovascular burden in most autoimmune and autoinflammatory conditions [36, 170, 171].

Adalimumab is another TNF blocking agents which was used in a 43 years old man with PAA. Neither etanercept nor rituximab is reported to be useful in aneurysmal type BD so far. In recent EULAR recommendations little information is provided regarding these agents in cardiovascular BD. In a recent systematic review the effectiveness of targeted agents are discussed in autoimmune posterior uveitis.

Our search results showed only two studies (both from Iran) addressing the use of rituximab in retinal vasculitis in BD and both had favorable response [172, 173] and several trials mostly as case reports with etanercept uveoretinal involvement even in juvenile BD [174, 175]. The reason for the far less studies on biological agents in vascular BD could be due to rather less frequent clinical vascular events and limited time for multiple drug trials with newly lunched drugs due to emergent nature of vasculo-Behcet.

Dyslipidemia, a known risk factor for cardiovascular events in both autoimmune conditions and general population, is accelerated with most biologic agents except for adalimumab, rituximab, and etanercept [176].

Interferon alpha, a natural glycoproteins that has antiproliferative and antiviral properties, is used in retinal vasculitis [177]. In a study it was shown that granulocytapheresis is more beneficial in 14 cases with long duration of BD with uveoretinitis [178]. In addition, hematopoetic stem cell transplantation was used in several cases with necrotizing vasculitis including three cases with BD with inconsistent clinical results [179].

6.7. Future Direction in Managing Vascular BD

As optimum management in BD is not achieved yet, future direction in treating BD could be focused on better understanding of common pathways in pathophysiology of vascular and nonvascular BD. No doubt is about the future role of biologic agents and targeted agents against proinflammatory cytokines such as IL-15, 17, 21, and adhesion molecules in controlling BD. Using biological agents targeting TNF-alpha may improve endothelial dysfunction responsible for more features of BD. Addressing many disease flare-ups after major or even minor physical or emotional stressors, we should also emphasize on potential therapeutic role of HPA axis support to prevent and control BD. Taking into consideration the important role of activated platelets and unique thrombosis-inflammation relationship in BD, more clinical application of antiplatelet (aspirin, clopidegrel) solely or in combination with colchicine as a PMN inhibitor is justified [31]. Role of statins as lipid lowering and antiinflammatory agents and improving endothelial dysfunction in BD could be matter of future studies for clinical use [180]. Detection of possible putative triggering microorganism(s) could direct treatment to some specific antibiotics and even categorize BD as a potentially infectious disease.

Acknowledgment

The authors thankfully appreciate Professor F. Davatchi for his kind support and Mr. M. R. Fahimi for producing Figure 2.

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Copyright © 2012 M. B. Owlia and G. Mehrpoor. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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