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COMUNICAÇÃO BREVE

Correção endovascular da aorta ascendente associada a implante de stents coronários

Eduardo Keller Saadi; Leandro de Moura; Alexandre Zago; Alcides Zago

DOI: 10.5935/1678-9741.20110025

RESUMO

Tratamento endovascular de pseudoaneurismas da aorta ascendente com o implante de stents coronários no mesmo procedimento foi factível, embora seja necessário um maior seguimento.

ABSTRACT

Endovascular treatment of ascending aorta pseudoanerysms with coronary stents implantation at the same procedure was feasable, although longer followup is necessary.
INTRODUCTION

Endovascular treatment of thoracic aortic diseases has progressed rapidly and led to a reduction in morbidity and mortality when compared to conventional surgery. The procedure is well established to treat descending thoracic and abdominal aorta pathologies [1-5]. However, only a few studies have reported on the treatment of lesions in the ascending aorta (AA) [6,7]. We describe the lifesaving implantation of stent grafts together with percutaneous coronary interventions (PCI) in two patients with AA pseudoaneurysm and coronary artery disease who had previously undergone coronary artery bypass grafting (CABG) and had mediastinitis.

CASE REPORTS

Patient 1 was a 56-year-old woman who had undergone CABG in another center 6 months earlier. She had a left internal mammary artery (LIMA) inserted into the left anterior descending (LAD) artery and two vein grafts, one to the right coronary artery (RCA) and the other to the circumflex artery. During hospitalization she developed mediastinitis and was treated with antibiotics and debridement that was repeated seven times. Five months after the operation, the sternal wound bled, but bleeding stopped after manual compression. A month later she had again severe bleeding through the sternum and shock, and was transferred to our hospital under manual compression of the wound. A computed tomography (CT) scan obtained 2 days before admission showed a small pseudoaneurysm in the mid part of the AA (Figure 1A). The LIMA was patent, but the vein grafts were occluded.

We decided to proceed with urgent endovascular repair. The AA diameter was 29 mm and the distance between the coronary ostia and the brachiocephalic trunk was 8.5 cm. We used two Gore-TexTM (W. L. Gore and Associates, Flagstaff, AZ) abdominal aortic cuff extensions (31.5 mm in diameter and 4.5 cm long) and 3 stents in the RCA (Figures 1B-C). PCI was performed via the right femoral artery, and the endografts were inserted via the right axillary artery. The patient was administered intravenous antibiotics and antiplatelet drugs for 4 weeks. Bleeding stopped, and a postoperative CT scan showed that the result was good with no endoleaks (Figure 1D).

Patient 2, a 74-year-old man who had undergone CABG (LIMA to the LAD), a vein graft to an occluded right coronary, and a vein graft to the circumflex artery) 6 years earlier, developed severe chest pain. During investigation, a pseudoaneurysm contiguous to the vein graft to the RAC was detected. All the grafts were patent; the patient had a tight left main coronary artery stenosis and a lesion in the circumflex artery. The AA diameter was 38 mm, and the distance between the coronary ostia and the brachiocephalic trunk was 10.5 cm. This patient underwent PCI (two drug eluting stents in the left main artery and one in the circumflex artery), and a Gore-TexTM TAG endoprosthesis (40 x 100) was implanted through the left femoral artery (Figures 2A-D). We left a "safety net" stiff guide wire from the right carotid artery to the descending aorta in case the endograft obstructed the brachiocephalic trunk origin.

A type 1a endoleak is currently under evaluation using CT scans. The prosthesis was not properly accommodated in the proximal segment of the AA, mainly in the portion close to the left coronary ostia (Figures 2A-D). The patient received antibiotics, aspirin and clopidogrel and was discharged 4 days after the procedure.

DISCUSSION

Mediastinitis with pseudoaneurysm formation is a dreadful complication of myocardial revascularization. Bleeding usually leads to death unless there is prompt intervention. Conventional surgery, the criterion standard for treatment in these situations, consists of replacement of the AA with a Dacron graft or homograft with extracorporeal circulation. The LIMA and other vein grafts are usually patent, and the pseudoaneurysm may be adherent to the sternum. The procedure is, therefore, associated with high mortality and morbidity rates.

Currently available aortic endografts have limitations to be used in the AA and aortic arch. Devices developed for the descending thoracic aorta are too long to be deployed between the coronary arteries and the brachiocephalic trunk [8-10].

In patient 2 the distance between the left coronary artery and the brachiocephalic trunk was 10.5 cm, the aortic diameter, 38 mm, and the distance between left common femoral artery and the aortic valve, 90 cm. In this particular case, a normal thoracic endograft (40 mm X 100 mm; Gore-TexTM - TAG) was inserted via the left femoral artery using the conventional 100-cm delivery system. The patient had three patent grafts: the LIMA inserted into the anterior interventricular (LAD) artery, a vein graft to the right artery, and a vein graft to the circumflex artery. As we would have to cover both vein grafts with the stent graft in the AA, a PCI was performed in the left main artery (two drug eluting stents) and in the circumflex artery. The vein graft to the RCA was simply closed with the endoprosthesis. All the procedures were carried out in one step.

Abdominal aortic delivery systems are too short to reach the AA from the femoral artery, and the diameters are too narrow to cope with a larger AA. In patient 1, the aortic diameter was 28 mm and the distance between the coronary ostia and the brachiocephalic trunk, 80 mm; therefore, we decided to insert two abdominal aorta extension cuffs (Gore-TexTM; 31.5 mm in diameter and 4.5 cm long each) via the right axillary artery, a technique that has been previously described [11]. In this patient, only the LIMA was patent to the LAD artery; the vein graft to the RCA was occluded, and the RCA had three points of critical stenosis. Therefore, three stents were implanted in this vessel.

Endovascular treatment of ascending aorta pseudoanerysms with coronary stents implantation at the same procedure was feasable, although longer followup is necessary.

To our knowledge these are the first two cases in which the AA has been treated using endovascular surgery together with coronary stent implantation.

CONCLUSION

Endovascular treatment of AA pseudoaneurysms following CABG is feasible. Concomitant PCI was safe and effective. Further studies should be conducted to evaluate this novel technique.

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Article receive on sexta-feira, 6 de maio de 2011

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