Leriche syndrome in a post-CABG patient.
Aorto-iliac occlusive disease was described by Robert Graham in 1814. Leriche syndrome was named after a famous French surgeon, Rene Leriche, who successfully operated and reported "his" syndrome in 1923, on a 29 years-old truck driver . Leriche syndrome refers to occlusion of the abdominal aorta distal to the renal arteries, aortic bifurcation and the common iliac arteries being usually involved. Occlusive disease involving the aorto-iliac segment develops especially in patients with risk factors or conditions that increase clotting of blood: hyperlipidemia, hypertension, diabetes mellitus, smoking and usually affects younger males ages 30-40.
The vessels above and below may be relatively normal. It is often associated with chronic renal failure and coronary artery disease .
Chronic lower extremity ischemia induces a triad of symptoms: intermittent claudication in the legs or buttocks, erectile dysfunction and absent or diminished femoral pulses . If aortic stenosis develops slowly, collateral vascular circulation can develop.
We present the case of a 48 years-old patient who underwent a primary isolated coronary artery bypass surgery at age of 37. In June 2003 he was diagnosed with acute anterior myocardial infarction non-Q. The coronarograhpy revealed an in-stent restenosis of previously percutaneous transluminal coronary angioplasty (PTCA) on right coronary artery (RCA) in 2001 and on left anterior descending (LAD) artery in 2002. A primary isolated coronary artery bypass graft (CABG) surgery was performed at Institute for Cardiovascular Diseases "Prof. Dr. George I. M. Georgescu" Iasi. Surgical myocardial revascularization was done by using a radial artery graft on RCA and an in situ left internal mammary artery (LIMA) graft on LAD. The postoperative evolution was favorable, with the resolution of angina and wound healing per primam.
We performed the grafts patency evaluation in August 2014 at Institute for Cardiovascular Diseases "Prof. Dr. George I. M. Georgescu" Iasi on a second-generation 128-slice DSCT scanner (Somatom Definition Flash; Siemens Healthcare, Forchheim, Germany). Scanning parameters were 120 kV tube voltage, tube current modulation with Care Dose 4D, 128 x 0.6 mm collimation. Peak arterial enhancement time was determined by the bolus tracking method. The contrast media for coronary CT angiography was injected using a power injector at 6 ml/sec, followed by 50 ml saline flush. Cardiac images were reconstructed with a slice thickness of 0.75 mm, using a soft-tissue convolution kernel (B26f) and a sharp-tissue convolution kernel (B46) for vessel wall calcifications, to compensate blooming artefacts.
Coronary CT angiography examination showed that the radial graft on RCA and the native right coronary artery were occluded. There was a in situ permeable LIMA graft that supply the LAD, and arterial anastomoses between the distal LAD and the collateral rami of RCA (retroventricular ramus for right ventricle and right posterolateral system) (Figure 1 and Figure 2).
At the level of the last axial cross-section of the initial cardiac acquisition, just below the emerging of superior mesenteric artery (SMA), we saw an important parietal thrombosis of the abdominal aorta. At that level, aorta was about 3 cm diameter but its permeable lumen was 1.7/1.3cm. An important arterial collateral network of right internal thoracic artery was developed into the right rectus sheath (Figure 3).
At the clinical examination, the patient has no angina, rare palpitations and intermittent claudication with a walking perimeter about 500 meters. He is a smoker of 10 cigarettes per day and he also has polydipsia. Its blood pressure was 160/80 mmHg, heart rate 90/minute, without cardiac decompensation signs, without cardiac murmurs. The pulse was absent at left superficial femoral artery and bilaterally at the posterior tibial arteries.
According to coronary CT angiography result and clinical signs and symptoms we decided to examine the abdominal aorta and inferior limbs using CT angiography. The angiography showed that the patient abdominal aorta was occluded inferior to the renal arteries. At the emerging of celiac trunk, abdominal aorta presented circumferential parietal thrombosis, about 7.4 mm thickness. At the SMA emerging the parietal thrombosis was 1.05cm thickness. There was no stenosis of celiac trunk or SMA emerging (Figure 4). The parietal thrombosis circumscribes the two ostia of renal arteries causing critic stenoses of 75-80% on the left side and 85-90% on the right side (Figure 5).
At the emerging of renal arteries, parietal thrombosis was eccentric, about 1.54 cm thickness, leaving an anterior permeable aortic lumen of 1.7/1.27 cm. Distally to the renal arteries, the aortic permeable lumen becomes increasingly tapered, parietal thrombosis was concentric and, at the level of the 4th lumbar vertebra, the abdominal aorta becomes occluded. The permeable aortic distal lumen gives rise to two well opacified voluminous lumbar collateral arteries, establishing anastomoses with internal iliac arteries.
The aortic bifurcation and common iliac arteries were occluded.
On the right side, the right internal iliac artery (RIIA) was supplied by the right lumbar collateral artery, but the right external iliac artery (REIA) was occluded. Right common femoral artery was supplied by right deep inferior epigastric artery and right deep iliac circumflex artery. Right superficial femoral, deep femoral and popliteal arteries were permeable, without atheromatosis or stenosis. The arteries of the right leg were normal.
On the left side, the left internal iliac artery (LIIA) was supplied by the left lumbar collateral artery. Only the left common iliac artery bifurcation was opacified. The left external iliac artery (LEIA) was supplied by collateral circulation. Left deep inferior epigastric and left deep iliac circumflex arteries supplied the left common femoral artery. Left superficial femoral, deep femoral and popliteal arteries were permeable, without stenosis. The arteries of the left leg were normal. There was an important pelvic and abdominal parietal collateral circulation.
The imaging diagnosis in this case was Leriche syndrome.
The embryologic development of the abdominal and lower extremity arteries allows collateralization flow . That is why in pacients affected by aorto-iliac occlusive disease, an important parietal and visceral arterial network develops. The role of this network is to supply all structures of the lower extremity by means of collateral channels . There are four common collateral circulatory pathways: a. the superior mesenteric and inferior mesenteric arteries can supply each other in a bidirectional manner through Riolan' s arterial arch ; b. the inferior mesenteric artery is anastomosed with the internal iliac artery via the hemorrhoidal plexus. Visceralvisceral collateral pathways that exist between celiac trunk and its divisions, SMA, IMA, and superior rectal artery are due to their common origin. The extension of atherosclerotic disease will determine these pathways to be used; c. The Winslow pathway involves internal thoracic (mammary) arteries that supply the external iliac arterial flow via the anastomoses between superior epigastric and inferior epigastric arteries into the abdominal rectus sheath ; d. The intercostal, subcostal and lumbar arteries supply the external iliac arteries through the superficial and deep iliac circumflex arteries or through the gluteal arteries (via internal iliac arteries).
The systemic-systemic collateral pathways include the lumbar, intercostal, deep circumflex iliac, internal thoracic, inferior epigastric and obturator arteries. These pathways derive from the embryologic segments of the dorsal aorta. Distal abdominal aorta occlusion tends to collateralize through systemic-systemic pathway [8, 9, 10]. This case has a particular condition by using the left internal mammary artery to revascularize the LAD artery. There was only right side anastomosis between right internal thoracic artery and right inferior epigastric artery. In a patient with aortoiliac occlusive disease the lower extremity arterial flow is dependent on these arteries and such a condition can cause lower extremity claudication . Moreover, the course of this artery may put it at risk to be cut during abdominal surgery.
The arterial supply of the lower limbs of our patient was not a critical one due to development of these particular collateral pathways. In this case, the parietal arterial anastomoses provide blood for the common femoral arteries via the inferior epigastric and deep iliac circumflex arteries. Moreover, the internal iliac arteries were supplied by two voluminous lumbar arteries raised from the end of the aortic permeable lumen. These findings determine the surgeon to temporize the surgical intervention for Leriche syndrome. The main priority in this case was represented by the critical stenoses of renal arteries that were managed through percutaneous transluminal angioplasty.
Another particularity in this case is represented by particular anastomoses between left and right coronary arteries. On the right side, also the radial arterial graft and the native right coronary artery are occluded. The left coronary artery succeed to supply the right coronary territory although in this case the coronary system was right dominated. Visible on CTA were the anastomoses between the distal LAD and the rami of the right coronary artery (retroventricular ramus for right ventricle and posterolateral system).
The left internal mammary artery is the best choice in cardiac surgery to revascularize the left anterior descending artery. In the case of patients with Leriche syndrome, acute ischemia of the lower limbs has been reported when the IMA was used in bypass grafting. In these patients, the IMA can be the main source of collateral circulation to the femoral arteries and its use in myocardial revascularization is associated with acute lower limbs ischemia. The percentage of flow to the lower limbs supplied by the mammary arteries depends on the location of the abdominal aorta obstruction, and it is greater when the obstruction is more proximal. Our patient did not have abdominal aorta flow immediately after the origin of the renal arteries, and despite using the left IMA in coronary revascularization, his quality of life was not affected in a critical way. The ideal treatment for these patients is still uncertain, because the experience is limited in this area.
Received: November 2014; Accepted after review: March 2015; Published: March 2015
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Cristina Luca (1,2), Alin Ciubotaru (1), Carmen Leferman (1), Radu Anghel (1), Elena Deju (2), Grigore Tinica (1,2)
(1)"Grigore T. Popa" University of Medicine and Pharmacy lasi, (2) Institute for Cardiovascular Diseases "Prof. Dr. George I. M. Georgescu", Iasi, Romania
* Corresponding author: Assist. Prof. Cristina Luca, MD, PhD, "Grigore T. Popa" University of Medicine and Pharmacy Iasi; "Prof. Dr. George I.M. Georgescu" Institute for Cardiovascular Diseases Iasi, Romania.
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|Title Annotation:||coronary artery bypass graft|
|Author:||Luca, Cristina; Ciubotaru, Alin; Leferman, Carmen; Anghel, Radu; Deju, Elena; Tinica, Grigore|
|Publication:||Archive of Clinical Cases|
|Article Type:||Clinical report|
|Date:||Mar 1, 2015|
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