Surgical intervention for chronic thoracoabdominal aortic dissecting aneurysms (cTAADA) is regarded as one of the most challenging procedures in the field of vascular surgery. For nearly six decades, open repair predominantly utilizing prosthetic grafts has been the treatment of choice for cTAADA. With advances in minimally invasive endovascular technologies, two novel surgical approaches have emerged: total endovascular stent-graft repair and hybrid procedures combining retrograde debranching of visceral arteries with endovascular stent-graft repair (abbreviated as hybrid procedure). Although total endovascular stent-graft repair offers reduced trauma and quicker recovery, limitations persist in clinical application due to hostile anatomical requirements of the aorta, high costs, and the lack of universally available stent-graft products. Hybrid repair, integrating the minimally invasive ethos of endovascular repair with visceral artery debranching techniques, has increasingly become a significant surgical modality for managing thoracoabdominal aneurysms, especially in cases unsuitable for open surgery or total endovascular treatment due to anatomical constraints such as aortic tortuosity or narrow true lumens in dissections. Recent enhancements in hybrid surgical approaches include ongoing optimization of visceral artery reconstruction strategies based on hemodynamic analyses, and exploration of the comparative benefits of staged versus concurrent surgical interventions.
Artificial intelligence in robot system is mainly divided into two types: endoscopic robot system and intracavitary robot navigation system. The endoscopic robot system can effectively shorten the time of vascular anastomosis and occlusion during vascular bypass surgery, while the intracavitary robot navigation system has good localization and real-time observation function. Moreover, it has significant advantages in complex lesions and special anatomical locations. High cost and complicated equipment debugging are the main factors that limit the wide application of robot systems. Artificial intelligence represented by robot system has obvious advantages and broad prospects in the field of vascular surgery, but more research is needed to improve its shortcomings and to further clarify its standard operation and long-term results.
This paper interprets clinical practice guideline for abdominal aortic aneurysm of American Society for Vascular Surgery in 2018.
This study aims to investigate whether displacement force on stents can accurately represents the displacement of the stent after endovascular aneurysm repair (EVAR) by comparing the measured stent displacement with the displacement forces calculated by computational fluid dynamics (CFD). And the effect of cross-limb and parallel-limb EVAR on stent displacements is further studied. Based on our objective, in this study, ten cross-limb EVAR patients and ten parallel-limb EVAR patients in West China Hospital of Sichuan University were enrolled. Patient-specific models were first reconstructed based on the computed tomography angiography images, then the stent displacements were measured, and the displacement forces acting on the stents were calculated by CFD. Finally, the \begin{document}$ \mathrm{cos}\;\alpha $\end{document} value of the angle between the displacement force and the displacement vector was used to analyze the matching degree between the displacement and the displacement force. The results showed that the displacement forces on cross-limb stents and parallel-limb stents were (2.67 ± 2.14) N and (1.36 ± 0.48) N, respectively. Displacements of stent gravity center, stent displacements relative to vessel, and vessel displacements of cross-limb and parallel-limb stents were (4.43 ± 2.81) mm and (6.39 ± 2.62) mm, (0.88 ± 0.67) mm and (1.11 ± 0.71) mm, (3.55 ± 2.88) mm and (5.28 ± 2.52) mm, respectively. The mean \begin{document}$ \mathrm{cos}\;\alpha $\end{document} for cross-limb and parallel-limb stents were 0.02 ± 0.66 and − 0.10 ± 0.73, respectively. This study indicates that the displacement force on the stent can’t accurately represent the displacement of the stent after EVAR. In addition, the cross-limb EVAR is probably safer and more stable than the parallel-limb EVAR.
Objective To discuss feasibility and effectivity of intraoperative ultrasound (US) during endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm. Methods A radiographic contrast nephropathy patient of abdominal aortic aneurysm and left internal iliac artery aneurysm was treated by EVAR without iodine contrast media assisted by US. Then summarized the data of this patient. Results The precise placement of the stent-graft was performed for abdominal aortic aneurysm. The left internal iliac artery aneurysm was successfully treatment with the stent-graft and coils. Intraoperative Ⅱ type endoleak from inferior mesenteric artery and Ⅰ b type endoleak from right iliac stent were identified by using US. The operative duration was 120 min and the blood loss was only 20 mL. Ⅱ type endoleak was still detected and the Ⅰ b type of endoleak was loss on postoperative a week. Conclusion Intraoperative US-assisted EVAR in patients with infrarenal abdominal aortic aneurysm represents a new option for intraoperative visualization of aortoiliac segments required as proximal or distal fixation zones and identification of endoleaks, especially in those patients with contraindications for usage of iodine-containing contrast agents.
ObjectiveTo assess whether the geriatric nutritional risk index (GNRI) of elderly patients can be used as an evaluation index for complications after endovascular aneurysm repair (EVAR) of abdominal aortic aneurysm (AAA).MethodsA total of 265 patients with EVAR who received abdominal aortic aneurysm between January 2011 to December 2017 were included in this study from West China Hospital of Sichuan University. All patients included in this study were subrenal arterial AAA. Statistical analysis of clinical data was performed. The value of GNRI in evaluating postoperative complications of EVER patients was evaluated.ResultsOf the 372 patients, 158 were included in the GNRI abnormal group (GNRI≤98), and 214 were included in the normal group (GNRI>98). Univariate analysis showed that the age (P=0.04), drinking (P=0.04), serum albumin level (P<0.001), BMI (P<0.001), GNRI (P=0.004), and stroke (P<0.05) were risk factors that affects postoperative complications of AAA. Multivariate analysis showed that preoperative GNRI [HR=0.687, 95%CI: (0.487, 0.968), P=0.032] abnormality was one of the risk factors affecting postoperative complications of AAA.ConclusionFor patients undergoing endovascular aneurysm repair of abdominal aortic aneurysm, the GNRI is one of the important indicator for predicting postoperative complications.
Objective To investigate the technical feasibility and effectiveness of intraoperative sac embolizaion with coils and fibrin glue for preventing type Ⅱ endoleak after endovascular aneurysm repair (EVAR). Methods A patient with abdominal aortic aneurysm (AAA), which had high risk of type Ⅱ endoleaks, was treated with combined packing of coils and fibrin glue in order to prevent type Ⅱ endoleak after EVAR. Percutaneous catheter preset and balloon occlusion were used to ensure accurate packing. Results At the end of the operation, the angiography showed that the blood flow of the stent and distal artery was unobstructed, there was no type Ⅰ and Ⅲ endoleaks, and delayed angiogram showed no collateral circulation of aneurysm. The procedure was successful. The operative duration was 120 min and the blood loss was only 20 mL. No complications such as colonic ischemia and ectopic embolism occurred, and the patient was discharged on 3 days after operation. At 6 months after follow-up, the computerized topographic angiography showed that the aneurysm cavity was completely thrombotic, without type II endoleak, and the diameter and volume of aneurysm were reduced. Conclusions The technique of intraoperative sac embolizaion with coils and fibrin glue during EVAR is safe and effective to prevent postoperative endoleaks, which is simple and feasibility. Intraoperative indwelling catheter and balloon blocking are the key points of successful implementation of this technique.
ObjectiveTo explore the efficacy and safety of hybrid surgery in the treatment of thoracoabdominal aortic aneurysm (TAAA). MethodsTwenty patients who were diagnosed with TAAA (including chronic thoracoabdominal aortic dissection aneurysm) and underwent hybrid surgery in Vascular Surgery, West China Hospital, Sichuan University were enrolled between January 2015 and December 2022. All the patients underwent retrograde reconstruction for visceral arteries in the open surgery. Additionally, one-stage or two-stage endovascular aortic repair with covered stents was performed. The patients’ clinical baseline information was collected. Moreover, the patients received clinical follow-up and imaging examinations postoperatively, whose informationwas collected. ResultsOne patient developed paraplegia and acute renal failure 16 days postoperatively in the hospital, and subsequently died in the hospital due to septic shock. Another patient underwent exploratory laparotomy for hemostasis due to anastomotic bleeding in the hospital. The other patients did not experience serious complications perioperatively. Nineteen patients were discharged from the hospital with long-term follow-up ranging from 10 to 144 months (median time: 48 months), and all of them had a long-term survival. No patients were observed with paraplegia, myocardial infarction, stroke, or rupture of aneurysm. None of the patients received reintervention during the follow-up, except for one patient who underwent ultrasound-guided puncture and suctionin the aneurysmallumen. ConclusionHybrid surgery is an effective treatment for TAAA with favorable short- and long-term safety and efficacy.