Time Intervals of the Appearance of False Anastomotic Aneurysm
1. Introduction
Although great strides have been made in vascular and endovascular surgery in last decade, still remains challenge to resolve problems with false aneurysm or pseudoaneurysm. This problem is especially connected to sites that are managing vascular patients mostly with open surgical treatment.
2. Definition
All aneurysms can be classified by location, size, shape and etiology. However, there is always significant confusion about what a false aneurysm or pseudoaneurysm is. True aneurysm presents with all three layers of arterial wall. Pseudoaneurysm or false aneurysm occurs as result of blood flow outside the normal layers of the arterial wall. Basically blood is going through the hole in the wall of artery into contained space outside. That blood is compressed by surrounding tissue so it finally reenters the artery during the cardiac cycle. Repeating this process, false aneurysm (outside the artery) begins to grow.
False aneurysm could be caused by trauma, infections, iatrogenic or every kind of conditions that could promote focal weakness within the arterial wall.
3. False traumatic aneurysms (FTA)
The management of FTA of arteries has a long history. One of the earliest texts known, the Ebers Papyrus (2000 BC), contains a description of FTA of the peripheral arteries [1]. During the second century AD; Antyllus treated FTA by applying a ligature above and below the lesion, incising the aneurysmal sac, and extracting the clot. In 1873 Pick provided an interesting and detailed account on his management of an FTA of a large femoral artery by digital compression, which had an unsatisfactory final result [1]. The first reported FTA repair was by Matas in 1888. He operated on a young male patient with a large FTA of the brachial artery that had developed after multiple gunshots [2]. After ligation of the main proximal and distal arteries, he opened the aneurysm sac and sutured all collaterals with back-bleeding. Fifteen years later, Matas described this procedure as a reconstructive endoaneurysmorrhaphy [3]. Vojislav Soubbotich, a Serbian surgeon treated 60 FTA and 17 traumatic arteriovenosum fistulas (TAVF) during the Balkan wars between 1912 and 1913. He performed some of the reconstructive procedures in 32 cases [4]. Rich published an interesting article titled, ‘‘Matas Soubottich Connection.’’ He said that Soubbotich’s technique and results had been outrun 40 years later, during the Korean conflict [5].
4. Incidence
It is difficult to determine the true incidence of FTA. Some series combine iatrogenic with traumatic lesions. During World War II Elkin and Shumacker noted that there were 558 (22.58%) FTA and TAVF among the total 2471 vascular injuries [6]. According to Hughes and Jahnke’s data, 215 cases of TAVF and FTA were described during the Korean conflict [7]. The largest series of surgically treated combat-related vascular injuries of about 1000 cases was published by Rich after the Vietnam war. They included 558 (incidence 55.8%) TAVF and FTA [8]. The first large civilian series of traumatic AVF and false aneurysms were published by Pattman et al. in 1964 [9], and Hewitt et al. in 1973 [10]. The incidence of TAVF and FTA was 2.3% (6/256) in the first study and 6.8% (14/206) in the second. According to experience of Davidović et al, is not that low. The incidence of TAVF and FTA, which included 140 cases, was 17.85%, and in civilian study with 273 cases it was 21.24% [11].
The most frequent cause of penetrating wounds during wars, as under civilian conditions, are bullets (figure 1) and fragments from various exploding devices (figure 2). In civilian experience, FTA and TAVF result from stab wounds as well [12]. FTA can also be caused by secondary damage, followed by pathologic moving of a bone fracture after penetrating and blunt trauma. In Davidović et al study, most of the FTA (superficial femoral 23.4% and popliteal 19.15%) were found at vessels near long bones (figure 3 and 4) [13]. Blunt trauma without associated bone fracture can also result in FTA and [14-16] (figure 5).
Lesions of the intrathoracic segment of the supraaortic branches can be often fatal. Formation of an FTA is not uncommon [17,18]. In 1968, Vollmar and Krumhaar described two such cases among 200 FTA, while Beall et al [19], Rich et al. [5], and Davidović et al [13] found only one such case (figure 6). In the most important war studies published between 1946 and 1975, all carotid arteries (common, external, internal) were involved in 3.8–20.5% of cases [6-8,20]. The incidence of all carotid arteries (common, external, internal) being involved, according to two of the most important civilian studies published during the same period, was 14.3–18% [10,12,13,21] (figure 6, 7 and 8).
In all of these studies FTA were mainly associated with lower extremity vessel (46.0–69.46%).6-13, 20
5. Diagnostic
The diagnosis of FTA is not difficult when the ‘‘hard signs’’ are present [22-24]. The problem is finding a way to recognize these signs and avoid failing to recognize FTA when the clinical picture is not typical [25]. Angiography has still very important roll as method of diagnostic, appropriate surgical approach as well as the type of vascular repair. Sophisticated diagnostic procedures, such as computed tomography, are extremely useful in cases of complex FTA.
6. Natural history and treatment
Natural history of FTA could be distal embolization (figure 9), rupture (figure 10), neurogenic compression or venous (figure 11) and cardiac failure. These lesions require prompt treatment. The treatment is relatively simple if the interval between injury and operation is not long [8,14,25-31]. Primary arterial repair without grafting is usually not feasible in late-presenting cases owing to the chronic nature of the FTA and the presence of fibrosis and inflammation. In the case of a small aneurysm, resection and primary end-to-end repair can be the safest alternative, although some advocate graft interposition [32]. The material of choice for repair is autologous saphenous vein [8,26,28-32]. The use of synthetic grafts is not recommended during the early phase because of infection. Synthetic grafts should be used only for a chronic FTA that involves large arteries (e.g., common femoral, subclavian).
According to some, endovascular procedures can be important in the management of critically injured patients, as well as those with chronic FTA [33-43]. Endovascular repair of a peripheral FTA seems attractive because it theoretically results in less morbidity and shorter hospitalization [33]. However, this experience is still limited, especially in young patients. There is also skepticism regarding the use of stents in the popliteal artery. The reason is the mobility of the knee joint. Because of their history of numerous complications, FTAs require prompt treatment. The treatment is simpler if there is not an extended interval between the injury and the operation. Endovascular repair is mostly indicated in locations where a surgical approach is not easily attained.
7. False anastomotic aneurysms (FAA)
Most common false aneurysm belongs to group of anastomotic aneurysms and they present clinical challenges in detection, evaluation, and treatment. The incidence is approximately between 1.4% and 4% [44]. Claytor and associates, in 1956, reported the first case of anastomotic aneurysm in a patient after prosthetic aortic graft placement [45].
In 1978, Wesolowski outlined these common causes of FAA [46]:
Suture material
Prosthesis defects in manufacture
Arterial changes
Other factors
Although silk was used as a suture material for anastomosis (prior to 1967), the most frequent cause of FAA was breaking of the suture material [47-54]. Introduction of synthetic polyfilament suture materials has significantly decreased this cause. Also, the prosthesis defects in manufacture have long ceased to be the cause of the FAA. A whole range of arterial wall changes could lead to the formation of an FAA: infection arterial degeneration, aseptic necrosis of the suture line, extensive endarterectomy, and large ‘‘patch’’ or anastomosis, according to the Laplace rule [53-63]. A mechanical stress in the anastomotic area was the most important cause from the group of ‘‘other’’ factors. Movements in the hip area creating this kind of stress are recognized as the reason for the most frequent occurrence of FAA in the inguinal area after aortobifemoral reconstruction [49,55,62,64,65]. Growth of tissue created between the graft and the inguinal ligament prevents the graft from ‘‘sliding’’ over the ligament when a hip movement is performed [49]. For this reason, the FAA often develops after aortofemoral reconstruction but rarely develops after axillofemoral, femorofemoral, or femoropopliteal reconstruction. Szilagyi and colleagues believed this is the reason for the FAAs that manifest later [53]. In his discussion of the Stoney and Albo study [47], Baker suggested that anastomosis in the femoral region must be covered by a mobilized sartorius muscle to decrease stress. Mechanical stress caused by insufficient graft length [50] or configuration of end-to-side anastomosis [47,56,66] and the mechanical stress caused by an extensive mismatch, occurring if the prosthesis is too rigid, are also described. With every pulse wave, the anastomotic part of the artery is dilated at least 10% more than the prosthesis. Given that this difference increases with the size of mismatch, the least resistant structures (suture material, artery, prosthesis) could be broken [57,67-70]. These pathogenic mechanisms are more likely to happen on an end-to-side than on an end-to-end anastomosis [66-71]. At first sight, it is normal to expect that FAAs develop more often after the reconstructive procedures performed owing to aneurysmal and not occlusive diseases. In other words, it could be expected that aneurysmal degeneration can enhance FAA development. However, there are not many studies on that.
There are some systemic factors which are thought to contribute to anastamotic aneurysm formation: smoking, hypertension, hyperlipidemia, anticoagulation, systemic vasculitides and generalized arterial weakness [72,73].
8. Incidence
According to the literature, FAAs most often develop in the inguinal area [74-78]. They can develop after the aortofemoral or infrainguinal bypass (figure 13, 14 and 15). They develop in 14 to 44% of inguinal anastomoses [57,63,68,79], although the cumulative risk in clinically significant FAAs is probably less than 10% [80-84]. Inguinal FAA development is clearly a matter of time for the risk increases with the age of the patient and the graft. The literature cites the following frequency of FAA after the aortofemoral bypass operation: 0.4% [85], 1.4% [86], 2% [87], 3.2% [88], 3.3% [89], 3.9% after 17 years of monitoring [53], 4% [90], 4.7% [91], 7% [92], 3.88% [93], and 4.3 [94]%. Cintora and colleagues stated that the FAA incidence in the aortobifemoral position is 4% if a Dacron graft is used and just 1% if a PTFE graft is used, all types taken into account [95]. If the publishing dates are analyzed, the number of FAAs was larger at an early age owing to the poorer quality of the prosthesis and suture material. Data in table 1. show changes in interval of inguinal FAA development through time [96].
Before 1975 | 36–48 [53,100] |
1976–1980 | 37–73 [52,70,78,88] |
1981–1990 | 72–92 [49,83,99] |
After 1990 | 111 [99] |
The main reason for this is the improvement in surgical technique and better quality of prosthetic and suture material. Also, it takes longer for the other etiopathogenetic factors, with the exception of the infections, to develop. Some literature data cite the fact that partial section of the inguinal ligament and enlargement of the tunnel in which the prosthesis lies, combined with free omental wrapping of the entire suture line, decrease the incidence of FAA [80].
Aortic FAAs are rare [77,97-99], and with the total number of operations in mind, their incidence of occurrence ranges from 2 to 10% [68-71]. They are believed to be more frequent after emergency procedures. Also, they are much more frequent after end-to-side than after end-to-end anastomosis [77] (figure 16) Owing to the development of surgical procedures, the occurrence of aortic FAAs has decreased to less than 1% [99]. With the lack of symptoms, it is difficult to diagnose aortic FAA. They are often detected during the evaluation of other abdominal diseases and conditions. Sometimes patients can notice the existence of a pulsatile abdominal mass, back pain, or weight loss [97,98]. Unfortunately, many aortic FAAs present only with acute expansion, rupture, gastrointestinal bleeding, infection, or distal embolism [94,95,97]. They are, in that manner, similar to abdominal aortic aneurysms.
The incidence of anastomotic aneurysm after carotid endarterectomy (with or without patch angioplasty) is approximately 0.3% [100]. They are most commonly associated with prosthetic infection [101].
9. Natural history and treatment
The disease development course of FAA, as well as that of any other aneurysm in general, can be complicated by a rupture (figure 12), compression, thrombosis, neurogenic compression and distal embolism [53,59,77,78,102,104,105]. Demarche and colleagues describe their experience with 142 femoral anastomotic aneurysms [106]. 64% were presented as an asymptomatic pulsatile mass, 19% presented with acute limb ischemia, 9% presented as a painful groin mass, 7% presented with acute hemorrhage, two patients (1%) presented with distal microemboli and limb edema. Infection was presented in 7% of all anastomotic aneurysms. Other series report similar presentations [107-109].
Sometimes it is very difficult to prove that infection is the cause of an FAA. Keeping in mind that an intraoperative culture and blood culture can often have a false-negative result, the surgeon has to rely on intraoperative findings. Perigraft infiltration or fluid and the absence of graft incorporation in the surrounding tissue could be the only signs of graft infection. Laboratory parameters such as CRP level and white blood cell count can help us make a decision. In cases characterized by the absence of infection, there is a choice in FAA treatment between the methods of complete or partial resection and graft interposition or bypass procedure [58,92,94,96,105]. In case of an infection as the cause of the FAA, only two treatment options are considered: ‘‘in situ’’ repair with a homoarterial graft and EAR [67,110]. Incidence of infection as a cause of FAA can be an underestimation considering the existence of low-virulence pathogens and false-negative intraoperative culture examinations. On the other hand, Edwards and colleagues found in their 45-month follow-up study that only 5.5% had FAA as a symptom of late graft infection [63]. Reinfection after 30 postoperative days appeared in one patient (4.8%).
Other than standard surgical approach, there have been cases in the literature recently in which FAA was treated by an endovascular placed graft [111]. Using this method in cases of FAA in the groin, problems can be caused by kinking and thrombosis of the implanted stent graft. It is hoped that very soon technology development will resolve this problem and provide a fast, safe, and less invasive procedure with better results. Several authors have published recent series on successful endovascular treatment of anastomotic aneurysms (table 2).
Number of Patients | Results (%) | Mean Follow-up (mo) | |||||||||
Series | Year | Location | Technique | Adjunctive Procedure | Infected | Technical Success | Major Compli-cations | 30-Day Mortality | Patency | ||
Yuan et al.[112] | 1997 | 12 | A/I | Covered stent | No | No | 100 | 17 | 0 | 100% | 16 |
Curti et al.[113] | 2001 | 11 | I | Covered stent | No | Yes | 100 | 0 | 0 | 100% | 28 |
Magnan et al.[114] | 2003 | 10 | A | Covered stent | Yes | No | 100 | 10 | 0 | 90% | 17.7 |
Faries et al.[115] | 2003 | 33 | A/I | Covered stent | Yes | No | 100 | 11 | 0 | — | — |
Gawenda et al.[116] | 2003 | 10 | A/I | Covered stent | Yes | No | 100 | 0 | 10 | 100% | — |
van Herwaarden et al.[117] | 2004 | 8 | A/I | Covered stent | No | No | 100 | 20 | 0 | 88% | 12 |
Derom and Nout[118] | 2005 | 7 | F | Covered stent | No | No | 100 | 0 | 0 | 100% | 18.6 |
Mitchell et al.[119] | 2007 | 10 | A/I | Covered stent | Yes | No | 100 | 10 | 0 | — | — |
Di Tommaso et al.[120] | 2007 | 6 | A | Covered stent | Yes | No | 100 | 0 | 0 | 100% | 26.1 |
Lagana et al.[121] | 2007 | 30 | A/I | Covered stent | Yes | No | 100 | 0 | 3 | 91% | 19.7 |
Piffaretti et al.[122] | 2007 | 22 | A/I | Covered stent | Yes | No | 100 | 5 | 0 | 96% | 16 |
Sachdev [123] | 2007 | 65 | A/I | Covered stent | Yes | Yes | 98 | 9 | 3.80 | 94% | 18.1 |
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