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Endovascular repair of a ruptured, extremely tortuous, descending thoracic aorta aneurysm with aortic coarctation

We have presented a case of a ruptured descending aortic aneurysm that was accompanied by extreme tortuosity and a pseudocoarctation at the level of the ligamentum arteriosum. We performed successful endovascular repair, covering the left subclavian artery, using a transapical-to-femoral artery (through-and-through) guidewire technique to overcome the tortuosity, with the option to perform balloon angioplasty in the case of an increased gradient over the coarctation. In the present case report, we have underlined the role of close collaborations with aortic expertise centers.

A descending thoracic aortic aneurysm (TAA) is a potentially lethal disease with an annual risk of dissection or rupture of 3% to 7%. 1,2 Thoracic endovascular aortic repair (TEVAR) is an excellent approach for emergency repair, even in complicated cases with suboptimal anatomy. To contribute to the literature on these challenging cases, we have reported our endovascular approach for a ruptured, extremely tortuous TAA with aortic pseudocoarctation. The patient provided written informed consent for the report of his case details and imaging studies.

CASE REPORT
A 67-year-old man with a history of dual-chamber pacing and a TAA (47 mm at 3 months before presentation) had presented with acute-onset thoracic pain. He was hemodynamically stable, with good cardiac function and palpable peripheral pulses. Computed tomography angiography (CTA) of the total aorta in the referring hospital revealed a rupture of the known TAA, with a tear flush distal to the left subclavian artery (LSA) and extensive subpleural and mediastinal hematoma (Fig 1). The proximal descending thoracic aorta was extremely tortuous and accompanied by a local narrowing, a pseudo-coarctation at the level of the ligamentum arteriosum. No additional aneurysms were detected within the CTA. The patient was immediately transferred to our aortic expertise center for emergency repair.
Owing to the involvement of the distal aortic arch, the proximal landing zone included the LSA (zone 2). Apart from open surgical repair, which requires deep hypothermic circulatory arrest, we considered covering the LSA via emergent TEVAR. The TEVAR would extend to w30 cm in length into the lower descending thoracic aorta. Without prior revascularization, the risk of spinal cord ischemia is increased. Cerebrospinal fluid drainage, however, would delay emergent intervention. Given the small left vertebral artery, cerebral flow is not at risk. However, the risk of left arm malperfusion is increased, necessitating immediate postoperative surgical revascularization. 3,4 Thus, we prepared for immediate wake-up, prevention of hypotension, and bilateral radial artery monitoring.
The extreme tortuosity could complicate adequate introduction of the stent graft. Therefore, we opted for a transapical through-and-through guidewire and the Gore cTAG stent graft with active control for its flexibility and correctable apposition. 5,6 A transbrachial guidewire can impede precise proximal positioning at the outer curvature of the short landing zone. Additionally, the pseudocoarctation (14 mm) could result in a significant hemodynamic gradient with the stent graft in situ.  transferred awake and hemodynamically stable to the intensive care unit with close monitoring of neurology and arterial blood pressure. Acetylsalicylic acid, 80 mg once daily, was started as per protocol. CTA at 1 week postoperatively confirmed adequate TEVAR positioning without an endoleak (Fig 3). The patient was discharged home at 14 days after surgery. At discharge, he had no signs of left arm malperfusion or central or spinal ischemia.
An absence of endoleak and aneurysm sac regression was found on follow-up CTA at 6 months postoperatively. A cerebrovascular accident was reported after discharge.

DISCUSSION
The details of this case report reflect our considerations and the endovascular technique used to overcome extreme tortuosity and local narrowing in a ruptured TAA without a proper proximal landing zone, aiming to prevent invasive and high-risk open surgical repair.
The refinement of endovascular approaches during the past decades profiled TEVAR as an excellent solution for TAA repair. Confirmative of its less invasive approach, superior perioperative outcomes and significantly shorter intensive care and hospital stay have been reported compared with open surgery. 7-10 Open repair for our patient would have been accessed through left-sided thoracotomy. Because the distal arch was involved, deep hypothermic arrest would have been required. Although the outcomes of open surgery improved significantly over the years, the risks are still high with 6% 30-day mortality, 7% stroke, 5% paralysis, and 2% permanent dialysis for the elective patient. The risks increase with increasing age, the presence of renal insufficiency, an increased clamp time and/or circulatory arrest, and the absence of cerebrospinal fluid drainage. An emergency setting lacks the time required for workup and the use of a dedicated team. Therefore, the risks in emergency settings will be significantly higher, even for hemodynamically stable patients. The perioperative mortality for TAA ruptures was reported to be #11% to 57%. [11][12][13][14][15]   The use of endovascular approaches represent a good alternative. However, complex cases require an extensive plan to create proximal and distal landing zones, overcome tortuosity, create arterial access, and limit malperfusion risks. A 30-day mortality risk of 0% to 10% has been described. 9,16 Notwithstanding its success regarding the limited invasiveness, the vast disadvantage of TEVAR has been the limited insight regarding the long-term consequences. The limited available data have suggested that TEVAR might be related to an increased reintervention rate compared with open surgery. The need for reintervention has been thought to result from ongoing disease or inadequate preoperative planning and indication management. 8,16 The details from this case have shown that an endovascular approach for this complex pathology can be performed safely and efficiently, underlining the role of preoperative planning in an aortic expertise center for highly complex cases.