Publications by authors named "Mickael Palmier"

Objective: The aim of this study was to evaluate the association between operative time (OT) and post-operative outcomes in complex endovascular aortic repair and to explore contributing factors to OT.

Methods: This retrospective, observational cohort study analysing data from a single centre included patients undergoing fenestrated endovascular aortic repair (FEVAR), branched endovascular aortic repair (BEVAR), or arch branched endovascular aortic repair (aBEVAR) from February 2018 to December 2024. OT was defined as the interval from first arterial access to closure.

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Open surgery for abdominal aortic aneurysms requires transient interruption of blood circulation, causing ischemia-reperfusion of downstream organs. Renal, mesenteric, and splanchnic arteries may be involved. No therapy has proven effective in preventing remote lung injury caused by ischemia-reperfusion after supra-coeliac aortic clamping.

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Objective: To evaluate the impact of a new dedicated stepped balloon mounted bridging stent (BS) on procedural time, radiation exposure, and early technical outcomes in patients undergoing Fenestrated Endovascular Aortic Repair (FEVAR).

Methods: A retrospective study was conducted on patients treated with four-fenestration FEVAR at a high-volume aortic center between March 2020 and March 2025. Patients were categorized into three groups: Standard balloon BS (Begraft, BG, Bentley) and renal access with preloaded renal catheters; Standard balloon BS (BG) and renal access with steerable sheaths; and stepped balloon BS (BeFlared, BF, Bentley) and renal access with steerable sheaths.

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Acute mesenteric ischemia is a severe and life-threatening condition with a mortality rate of up to 50%. Its treatment, which depends on the etiology, focuses on preserving intestinal viability through prompt restoration of blood flow. While it is well established that intestinal ischemia-reperfusion results in significant local tissue damage, it is less recognized that it can also lead to remote tissue injuries, particularly in the lungs.

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Complete thrombosis of the false lumen in chronic aortic dissection is essential to achieve positive aortic remodeling. However, persistent perfusion through aortic collaterals, dissected supra-aortic trunks (SAT), and renovisceral arteries often complicate this process. Our approach to treat chronic dissections integrates TEVAR and custom-made FBEVAR, often combined with supra-aortic trunk debranching or frozen elephant trunk (FET) procedures.

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Background: The purpose of this study was to evaluate the outcomes of branched endovascular aortic repair (BEVAR) in post-dissection thoracoabdominal aortic aneurysms (PD TAAAs), as well as define preoperative planning and intraoperative execution.

Methods: Patients who underwent BEVAR in PD TAAAs from 2019 to 2024 were identified using a prospectively maintained electronic database at a single, tertiary-care hospital. Patient demographics, comorbidities, indication for the procedure, anatomic and procedural details, and outcomes were retrospectively recorded.

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Thoracic aortic aneurysms evolving within a type IIIb chronic aortic dissection are mostly treated with the deployment of an endograft. However, several cases of dissecting aneurysms are associated with a significant dilatation of the aortic arch. These cases are usually managed in 2 steps: arch reconstruction or supra-aortic trunk debranching at first and a secondary graft deployment for the descending thoracic aorta.

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Background: Endovascular aortic surgery is increasingly becoming the standard treatment. Percutaneous access preclosing systems appear to be effective and notably the Proglide (PG). We aimed to prospectively assess the clinical effectiveness of combining ultrasound-guided femoral puncture with ultrasound-guided PG deployment.

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The purpose of this article is to highlight an innovative technique in the surgical management of aortic aneurysms in the presence of a horseshoe kidney. The technique involves an anterograde aortic bypass from the distal thoracic aorta to the major renal artery with the primary advantage to a significant reduction in renal ischemia time.

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The widespread use of computed tomography (CT) for diagnosing and screening abdominal conditions often reveals rare, asymptomatic anomalies. There is a wide range of documented congenital variations in the anatomy of the inferior vena cava (IVC) and hepatic veins. In this report, we detail an exceptionally unusual variant of the IVC that follows a frontward and intraliver course, terminating at the anterior section of the right atrium.

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Article Synopsis
  • The study evaluated how COVID-19 affected the number of patients undergoing two types of surgery for complex aortic aneurysms (cAAs) from 2018 to 2021.
  • It found that while the overall volume of endovascular repairs (ER) remained stable during the pandemic, the case load for open surgical repairs (OSR) significantly decreased.
  • Additionally, ER patients had shorter hospital and ICU stays during the pandemic without negatively impacting their early mortality and morbidity rates.
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Introduction: Arteriovenous fistula (AVF) rarely occurs in the portal venous system. Aetiologies include iatrogenic, surgical, and penetrating trauma of the abdomen. Clinical manifestations of superior mesenteric portal arteriovenous fistula (SMPAVF) are right heart failure, mesenteric ischaemia, or signs of portal hypertension.

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Objective: Management of postdissection thoracoabdominal aneurysms with a fenestrated and/or branched endograft (F/BEVAR) is associated with favorable outcomes. Treatment should include both true lumen endografting and false lumen occlusion (FLO). Favorable results have recently been reported for FLO in the false lumen of the thoracic aorta.

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Background: We hypothesized that supraceliac aortic cross clamping could induce lung injury mediated by an inflammatory ischemia-reperfusion (IR) trigger. We aimed to characterize glycocalyx (GCX), a component of endothelial membrane, participating to remote lung injury.

Methods: Rats underwent supraceliac aortic cross clamping for 40 min and were sacrificed at 0, 3, 6, and 24 hr of reperfusion (n = 10/group).

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Purpose: The incidence of type II endoleaks (ELII) after endovascular aneurysm repair (EVAR) ranges from 10-44%. Aneurysm thrombus density after EVAR could predict successful aneurysm exclusion.

Materials And Methods: Twenty-seven patients with an abdominal aortic aneurysm (AAA) who had a CT scan within the first 45 days (early group) post-surgery or after 7 months (late group) were included.

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We present an uncommon case of a 16-year-old woman with type 1 neurofibromatosis and renovascular hypertension due to bilateral renal stenosis associated with asymptomatic digestive artery stenosis. Our patient was treated by several autologous bypasses to the superior mesenteric artery and the left and right renal arteries. She had no postoperative complications and good clinical and imaging outcomes at 10 years.

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Background: Open surgical repair (OSR) for thoracoabdominal aortic aneurysms (TAA) is associated with a high pulmonary and renal morbidity rate. Ischemic preconditioning (IPC) is a mechanism of protection against the deleterious effects of ischemia-reperfusion. To our knowledge IPC has never been tested during OSR for TAA.

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We present a case of abdominal aortic aneurysm open repair planned with temporary left ventricular support (Impella®) in a patient suffering from severe chronic heart failure. Only 1 single similar case was reported in the literature from 1974.

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Totally occluded aortic aneurysm is a rare pathology. The medical history and the evolution are unknown. We present a case of a regularly followed up 60-year-old man with chronic thrombosed aneurysm, presenting with mycotic acute rupture.

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