Hybrid repair of an aortocaval fistula and inferior vena cava external compression caused by an inflammatory aortoiliac aneurysm: a case study
© Banno et al.; licensee Springer. 2014
Received: 16 March 2014
Accepted: 11 August 2014
Published: 27 August 2014
We report a case of aortocaval fistula successfully treated by hybrid operation.
A 73-year-old female suffering from malignant lymphoma and painful leg edema was transferred to our institution. Computed tomography revealed an aortoiliac aneurysm. The inferior vena cava was compressed by displacement of the abdominal aortic aneurysm. The bilateral internal iliac and ovarian veins were markedly dilated. Diagnosis was an aortoiliac aneurysm with aortocaval fistula. The treatment options were open surgery or an intervention with bypass surgery. Because of narrow iliac access for a bifurcated stent graft, aorto-uni stentgraft treatment followed by bypass surgery was finally decided. Following stent graft insertion and iliofemoral artery bypass, the aneurysms and fistula were successfully excluded without endoleaks. To treat the inferior vena cava compression, the kissing technique was used to place bare metallic stents across the bilateral common iliac veins and inferior vena cava, which improved the clinical symptoms.
Discussion and Evaluation
In this aortocaval fistula caused by AAA, a minimally invasive treatment of stentgraft and bypass surgery with venous flow recovery was chosen as a hybrid treatment. Intravascular intervention was the most suitable in this situation. Bare stent placement for venous occlusion was also effective for revascularization of vena cava flow.
Recent advances in endovascular devices, including stent grafts and bare metallic stents, will be helpful for effective noninvasive treatment for aortocaval fistula circulation.
KeywordsAortocaval fistula (ACF) Abdominal aortic aneurysm (AAA) Stent graft Iliofemoral bypass Inferior vena cava (IVC)
Aortocaval fistula (ACF) is a comparatively rare pathology with a high operative mortality rate of 21%–55% (Alexander and Imbembo 1989). Rapid deterioration in surgical invasiveness and large perioperative changes in the hemodynamic status are believed to contribute to this high mortality (Ghilardi et al. 1993). Measures such as early diagnosis and prompt surgical intervention are therefore important in patients with ACF. Symptomatic ACF has been repaired through open surgery. These procedures can be technically challenging, with high operative mortality rates approaching 30% (Mitchell et al. 2009). Recently, reports concerning endovascular treatment employing endoprosthesis have been increasing (Godart et al. 2005; Vetrhus et al. 2005; Melas et al. 2011a, [b]).
We report a case of ACF successfully treated using a hybrid combination of stent graft insertion and kissing stent technique for inferior vena cava (IVC) compression in a patient with an abdominal aortic aneurysm (AAA).
A 73-year-old female with a history of thoracic surgery had been diagnosed with malignant lymphoma. During treatment, an aneurysm of the abdominal aorta and right common iliac artery (CIA) was found on a computed tomography (CT) scan. Because CT performed in the previous month showed a normal aorta, the aneurysm was believed to be an inflammatory process. The patient was transferred to our hospital for treatment of the aneurysm. On admission, she presented with painful right leg edema that had begun 1 month earlier. Laboratory findings on admission were positive for hepatitis C virus antibody, pancytopenia, liver dysfunction, and heart failure. There was no laboratory data suggesting inflammation.
Radiographic findings and treatment indications on admission
The bilateral femoral arteries were exposed and looped under general anesthesia. A 4-Fr sheath (Radifocus Introducer II; Terumo, Tokyo Japan) was then inserted into the right cubital vein, and an intravenous route was established. Aortic angiography revealed a terminal aortic aneurysm extending to the right CIA. The adjusted IVC was obliterated because of external compression caused by the aneurysmal sac. Early venous filling of the internal iliac veins and ovarian veins was also visualized (Figure 3a). These findings suggested that ACF was caused by the rupture of the right CIA aneurysm with IVC compression due to displacement of the aneurysmal sac and development of collateral circulation in the pelvic venous system.
From the right transfemoral artery, the right internal and external iliac arteries were embolized by using detachable micro coils to prevent endoleaks. A through-and-through technique was used from the right cubital vein through the right femoral vein. After making a small incision at the left iliac artery, forceps were used to clamp the distal portion. A 14-Fr sheath (Ultimum™ EV Hemostasis; St. Jude Medical, USA) was inserted into the abdominal aorta along a preloaded stiff guide wire (Amplatz Ultrastiff guidewire; Cook Medical, USA). A stent graft (Excluder Leg®, 16 mm–8 cm; W.L. Gore, AZ, USA) was inserted and deployed at the portion between the abdominal aorta just below the inferior mesenteric artery orifice and the distal portion of the left CIA. Then, a 27-mm Equalizer (Equalizer™ Occlusion Balloon Catheter, Boston Sientific,USA) was used to apply balloon touch-ups. In addition, percutaneous transluminal angioplasty balloon (XXL, 16 mm × 2 cm; Boston Scientific, USA) dilatation was applied at the proximal and distal portions of the stent graft. Aortic angiography showed no endoleaks after stent graft insertion (Figure 3b).
Postoperative radiological findings and clinical course
Discussion and evaluation
Ruptured AAA can perforate neighboring structures such as the intestinal tract, IVC, and renal veins, but ACF is comparatively rare and accounts for only a small percentage of all ruptured AAAs [3%–4% (Alexander and Imbembo 1989; Baker et al. 1972) or 2%–4% (Brewster et al. 1991)]. Symptoms of ACF vary depending on the duration and rate of blood flow through the fistula and can include abdominal pain, back pain, high output, bilateral leg pain and edema, kidney dysfunction, hematuria, and liver dysfunction. The classic triad of symptoms consists of back pain, palpable AAA, and machinery murmur (Farid and Sullivan 1996). Another noteworthy feature of this pathology is the high operative mortality rate of 30%–36.4% (Ghilardi et al. 1994; Davidovic et al. 2002). This may be attributable to the deterioration in surgical tolerance of patients with ACF.
ACF causes high-output cardiac failure, which progresses relatively quickly to advanced cardiac failure. Renal failure and liver failure can also arise through a decrease in renal blood flow due to elevated renal vein pressure and reduced renal artery pressure and a decrease in liver blood flow due to elevated hepatic vein pressure. The large changes in the hemodynamic status before and after surgery may also influence operative mortality rates (Ghilardi et al. 1993). Measures such as early diagnosis and prompt surgical intervention are important in patients with ACF. Multiphasic contrast CT and color Doppler ultrasonography should be useful to establish early diagnosis. Symptomatic ACF has traditionally been repaired using open surgery. The procedures can be technically challenging, with significant intraoperative blood loss and high operative mortality rates approaching 30% (Mitchell et al. 2009).
Recently, reports concerning endovascular treatment employing endoprostheses have been increasing (Godart et al. 2005; Vetrhus et al. 2005; Melas et al. 2011a,[b]). In the present case, clinical symptoms had not deteriorated very much because of the fistulous flow behavior. Bulging of the aneurysmal sac had compressed the IVC, which resulted in stenosis of the vena cava. The fistulous flow did not return directly to the proximal segment of the IVC. Instead, the blood flow eventually returned to the IVC via a collateral route from the bilateral ovarian veins to the renal veins. Thus, the pressure increase in the IVC proximal from the fistula was probably suppressed to a certain extent, and heart failure and renal dysfunction did not occur. Significant blood flow from the distal IVC to the iliac veins caused painful leg edema.
Concerning the treatment of the aneurysms, we selected a straight stent graft from the abdominal aorta to the left CIA instead of a bifurcated stent graft because of the narrow diameter of the abdominal aorta and use of the external iliac artery as an access route. Usually, the main bifurcated EVAR device needs an 18-Fr or 20-Fr outer diameter sheath for deploying the stent graft. In these cases involving a narrow aorta, the leg component of EVAR devices is useful for access and fitting of the aortic caliber.
Treatment options for venous occlusion, particularly in the vena cava or common iliac veins (CIVs), are controversial. In ACF, decompression of the aneurysmal sac using a stent graft may release the venous flow. However, thromboembolic risk, including pulmonary embolism, is inevitable. To reduce a massive thromboembolism, a metallic stent in the venous system was believed to be effective for maintaining the flow. In our treatment of IVC compression at the confluence of both CIVs, we used the kissing technique to insert bare metallic stents into both femoral veins. Vena cava compression usually results in bilateral CIV occlusions. In this occlusive case, insertion of a bare metallic stent via the kissing technique demonstrated great efficacy for flow recovery in the venous channels.
In ACF cases, the treatment options include open surgery, interventional treatment, and a hybrid treatment of intervention and open surgery. In open surgery, both IVC stenosis and aneurysm are repaired. However, the invasiveness of the procedure may result in an overall deterioration of the patient’s condition. Because the patient’s status was determined to be relatively stable, we selected hybrid treatment. An additional factor in our decision was IVC compression caused by the aneurysm that required placement of bare metallic stents for revascularization from the occlusive vena cava. Therefore, we reasoned that intravascular intervention was the most suitable indication in such a situation. In this case, stent placement using the kissing technique in both CIVs up to the IVC was effective for revascularization of vena cava flow that caused symptomatic lower leg edema.
In summary, we reported a case of ACF that was successfully treated by stent graft insertion with additional surgical iliofemoral bypass. Recent advances in endovascular devices, including stent grafts and bare metallic stents, will be helpful for effective noninvasive treatment of ACF circulation.
Written informed consent was obtained from the patient’s husband for publication of this case report and any accompanying images.
We have not received any funding from any institution for this work.
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