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\def\makelabel##1{\upshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{specHead}[2]% {\vspace{20pt}\hrule\vspace{10pt}% \phantomsection\label{#1}\markright{#2}% \pdfbookmark[2]{#2}{#1}% \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}% }{} \def\TheFullDate{2018-01-15 (revised: 15 January 2018)} \def\TheID{\makeatother } \def\TheDate{2018-01-15} \title{Spontaneous Aortocaval Fistula Associated with Ruptured Abdominal Aortic Aneurysm-Unique Endovascular Repair} \author{}\makeatletter \makeatletter \newcommand*{\cleartoleftpage}{% \clearpage \if@twoside \ifodd\c@page \hbox{}\newpage \if@twocolumn \hbox{}\newpage \fi \fi \fi } \makeatother \makeatletter \thispagestyle{empty} \markright{\@title}\markboth{\@title}{\@author} \renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@ \belowdisplayskip \abovedisplayskip \abovedisplayshortskip \z@ plus2\p@ \belowdisplayshortskip 4\p@ plus2\p@ minus2\p@ \def\@listi{\leftmargin\leftmargini \topsep 2\p@ plus1\p@ minus1\p@ \parsep 2\p@ plus\p@ minus\p@ \itemsep 1pt} } \makeatother \fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm} \fancyhf{} \setlength{\headheight}{14pt} \fancyhead[LE]{\bfseries\leftmark} \fancyhead[RO]{\bfseries\rightmark} \fancyfoot[RO]{} \fancyfoot[CO]{\thepage} \fancyfoot[LO]{\TheID} \fancyfoot[LE]{} \fancyfoot[CE]{\thepage} \fancyfoot[RE]{\TheID} \hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true} \fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}} \date{} \usepackage{authblk} \providecommand{\keywords}[1] { \footnotesize \textbf{\textit{Index terms---}} #1 } \usepackage{graphicx,xcolor} \definecolor{GJBlue}{HTML}{273B81} \definecolor{GJLightBlue}{HTML}{0A9DD9} \definecolor{GJMediumGrey}{HTML}{6D6E70} \definecolor{GJLightGrey}{HTML}{929497} \renewenvironment{abstract}{% \setlength{\parindent}{0pt}\raggedright \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt \textcolor{GJBlue}{\large\bfseries\abstractname\space} }{% \vskip8pt \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt } \usepackage[absolute,overlay]{textpos} \makeatother \usepackage{lineno} \linenumbers \begin{document} \author[1]{Emilia M Krol MD} \renewcommand\Authands{ and } \date{\small \em Received: 16 December 2017 Accepted: 2 January 2018 Published: 15 January 2018} \maketitle \begin{abstract} Aortocaval fistula (ACF) is a rare complication associated with abdominal aortic aneurysm. Open repair of this entity is well described in the literature. Less well described are endovascular means for repair as well as mid and long term outcomes. We describe a case of a ruptured abdominal aortic aneurysm that presented with an aortocaval fistula and was managed with endovascular interventions on both the aorta and inferior vena cava. Following placement of an aortic stent graft, there was persistent flow through the ACF and a large Type I endoleak. Subsequent management included placement of second bifurcated stent graft in the inferior vena cava. No further endoleaks were encountered. To our knowledge, this is a unique management of a rare complication of aortic aneurysm rupture with fully endovascular exclusion of ACF. \end{abstract} \keywords{aortocaval fistula, endovascular repair, abdominal aortic aneurysm, inferior vena cava, type ii endoleak.} \begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) \textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark} \end{textblock*} \begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) \textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}} \end{textblock*} \let\tabcellsep& \section[{I. Introduction}]{I. Introduction}\par pontaneous aortocaval fistula (ACF) was described first by Syme in 18311, complicating a syphilitic aneurysm. It is a rare entity, associated with 1\% -4\% of ruptured abdominal aortic aneurysms (AAA). The classic presentation of an ACF includes high-output cardiac failure, a palpable pulsatile abdominal mass and a machinery bruit. The presence of all of these symptoms occurs in only 20-50\% of patients. Successful treatment of ACF by both open and endovascular methods has been reported, with mortality rates as high as 60\% for the former and a paucity of data for the later3. There are no reported cases in which stent grafts were used to treat both the arterial and venous components of an ACF. \section[{II. Case Presentation}]{II. Case Presentation}\par A 61-year-old male was transferred to the Emergency Room from an outside hospital with a known ruptured AAA.\par Upon arrival, he was hypotensive complaining of severe abdominal pain radiating to the back with new-onset paresthesia of his bilateral lower Extremities. The duration of symptoms was approximately two hours before evaluation in our institution. The patient was not in congestive heart failure. A CT Angiogram of the abdomen and pelvis was obtained and revealed a ruptured 7.5cm infrarenal AAA with contrast extravasations into the retro peritoneum. There was a significant contrast enhancement of the inferior vena cava (IVC) suggesting the presence of ACF (Fig {\ref 1}). The aneurysm neck was highly angulated and approximately 12mm long. The patient was taken to our hybrid operating room (OR) for further treatment. Wire access was obtained through bilateral femoral artery cut-downs, and a Medtronic 26mm Talent main body device with AneuRxiliac limbs was placed with preservation of both hypo gastric arteries. Aortography revealed a large Type I end leak (EL) and persistent ACF ( Fig 2, Fig 3). A large Palmaz stent was mal-deployed at the neck and was, therefore, moved proximally and fully deployed in the thoracic aorta. A second well deployed Palmaz stent failed to completely resolve the Type I EL as did placement of a proximal aortic cuff with intentional coverage of the left renal artery. The femoral veins were cannulated, and a large compliant balloon was inflated in the IVC to occlude the ACF with a resultant significant decrease in the Type I EL suggesting that closing the fistula by placing a stent graft within the inferior vena cava (IVC) at the bifurcation might resolve the large end leak. A sufficiently large stent graft was not available at the time so the patient was transferred to the ICU where he remained stable until he returned to the operating room on the second post-operative day. The ACF was excluded by a deployment of a Gore TAG device within the IVC followed by placement of bilateral iliac vein reversed Gore 16x20 limbs (Fig 4). Aortography demonstrated a small Type III end leak which was not treated at this point.\par In the ensuing days, however, the patient's hematocrit decreased and a repeat CTA showed the retroperitoneal pseudo aneurysm and aneurysm to have significantly increased in size, a recurrent ACF and both large Type I and III endoleaks and a right femoral DVT. The patient returned to the OR for possible endovascular or open aneurysm repair. During surgery, the left and right iliac stent grafts were relined with Gore excluder limbs, the Palmaz stent was once again repositioned into the thoracic aorta, and the proximal aortic stent graft was re-ballooned with a noncompliant balloon. All endoleaks were now resolved as was the ACF (Fig {\ref 5}). An IVC filter was also placed. After this procedure, the patient's post-operative course was uncomplicated and discharged home in good condition. At four year follow-up, the patient's aneurysm remains excluded with continued sac shrinkage and no evidence of an ACF. \section[{III. Discussion}]{III. Discussion}\par The pre -operative diagnosis of spontaneous ACF is crucial when planning AAA repair both in elective and emergency cases. Before endovascular techniques, ACF represented an unwelcome challenge to the vascular surgeon who attempted the open repair. The most common method used was over-sewing the fistula from within an opened aneurysm sack, but this is associated with significant blood loss and high mortality, even in elective cases \hyperref[b3]{4,}\hyperref[b4]{5,}\hyperref[b5]{6} .\par The first description of the use of endovascular stent grafts in the treatment of arteriovenous fistulas was described by Boudghene et al. in an experimental study on a sheep model, where fistulas were created percutaneously \hyperref[b6]{7} . This study was followed by a published case series by Juan C. {\ref Parodi 8} , in which he described the successful use of endovascular techniques for treatment in patients with arteriovenous fistulas as a result of a traumatic injury. The first use of endovascular exclusion for the treatment of ACF associated with AAA was described by Beveridge et al in 19989, and was followed by several similar reports \hyperref[b7]{[8]}\hyperref[b8]{[9]}\hyperref[b9]{[10]}\hyperref[b10]{[11]}\hyperref[b11]{[12]}\hyperref[b12]{[13]}\hyperref[b13]{[14]} . In all of these cases, implantation of an aortic stent graft proved adequate to resolve the ACF, and none of the patients were reported to require further treatment.\par Cases in which placement of an aortic stent graft does not resolve an ACF remain a challenge for vascular surgeons. There have been three reports in the literature describing the use of Amplatzer plugs to occlude unresolved fistulas after aortic stent graft placement. \hyperref[b14]{[15]}\hyperref[b15]{[16]}\hyperref[b16]{[17]} and one, describing the use of EmbikrilatBrauhistoacrylic gel \hyperref[b17]{18} . In another report, a covered tubular stent graft, deployed in the IVC, was used to successfully treat a persistent ACF manifesting as a type II endoleak in a patient who had endovascular treatment of ruptured abdominal aortic aneurysm six months prior \hyperref[b18]{19} .\par Our patient had a preoperative diagnosis of a large aneurysm which had ruptured both into the IVC and into the retro peritoneum. Despite repair of the aortic rupture with a stent graft and additional procedures including a Palmaz stent and a proximal aortic cuff, there remained a large type Iaendoleak and ACF. Placement of a bifurcated aortic stent graft within the IVC to completely cover the ACF ultimately resolved the type Iaendoleak and the ACF. A possible theory for why this succeeded is that the presence of a large ACF behaved as a large, low pressure outflow sump making adequate sealing of the aortic stent graft impossible. With the closure of the venous portion of the ACF, the outflow transitioned to a high -resistance system, which eventually led to thrombosis of fistula and resolution of endoleak. Wang et al described their experience with three cases of endovascular repair of ACF with hostile aortic anatomy. In all cases only aortic repair was performed and two out of three patients suffered from early type 1 or 3 endoleak requiring reintervention \hyperref[b19]{20} . Although there are anecdotal reports of successful endovascular treatment of aortic rupture with ACF by placement of an aortic stent graft alone, the size of the ACF is not described nor is the quality of the proximal aortic neck. In our case the ACF was large and the proximal aortic neck highly angulated and short, making it difficult to manage with only one stent-graft exclusion.\par End luminal stent-graft repair of IVC and other vein injuries have been previously described, mainly for treatment of traumatic injuries \hyperref[b20]{21} . No long-term results for these treatments have thus far been reported in the literature. Silveira et al described similar repair of ACF with coverage of the venous portion of the fistula with a stent graft cuff from the venous access22. Similarly, Elk assaby et al described two cases with a simultaneous deployment of aortic and IVC stent grafts to exclude ACF in two patients with ruptured AAA with good shortterm results. \hyperref[b22]{23} In our case, the midterm result has proved to be excellent and we will continue to monitor this patient for long-term treatment durability.\par Clearly, despite our good result, further reports of similar treatments are necessary before any relevant conclusions or recommendations can be made for this uncommon entity. \section[{IV. Conclusion}]{IV. Conclusion}\par Although aortocaval fistula, as a complication of a ruptured aortic aneurysm, remains a challenge in surgical management, endovascular treatment of such condition is feasible but may require both aortic and caval interventions for ultimate success. \begin{figure}[htbp] \noindent\textbf{12345}\includegraphics[]{image-2.png} \caption{\label{fig_0}Fig. 1 :Fig. 2 :Fig. 3 :Fig. 4 :Fig. 5 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-3.png} \caption{\label{figure3}}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-4.png} \caption{\label{figure4}}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-5.png} \caption{\label{figure5}}\end{figure} \footnote{© 2018 Global Journals 1} \backmatter \begin{bibitemlist}{1} \bibitem[Takaseya et al. ()]{b2}\label{b2} \textit{}, T Takaseya , S Hiromatsu , H Akashi , T Okazaki , S Tobinaga , S Aoyagi . \textit{Ann Thorac Cardiovasc Surg} 2007. 13 p. . \bibitem[Schmidt et al. ()]{b1}\label{b1} \textit{Aorto-caval fistula -an uncommon complication of infrarenal aortic aneurysm Thorac Cardiothorac Surg}, R Schmidt , C Burns , M Walter , H Erasmi . 1994. 42 p. . \bibitem[Boudghene et al. ()]{b6}\label{b6} ‘Aortocaval fistula -percutaneous model and treatment with stent graft in sheep’. F Boudghene , M Sapoval , M Bonneau , J M Bigot . \textit{Circulation} 1996. 94 p. . \bibitem[Daniel and Spence ()]{b3}\label{b3} ‘Aortocaval fistula treated by aortic exclusion’. Woolley Daniel , S Spence , RK . \textit{J} VascSurg1995. 22 p. . \bibitem[Purdy et al. ()]{b4}\label{b4} ‘Aortocaval fistularare complication of ruptured abdominal aortic aneurysm’. M R Purdy , D L Lutrin , M G Veller . \textit{SAJS} 2009. 47 (3) p. . \bibitem[Beveridge et al. 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