Significance of Cold Renal Perfusion on Renal Function and Clinical Outcomes When Renal Ischemia Time Exceeded 30 Min during Pararenal and Juxtarenal Abdominal Aortic Aneurysm Surgery

Objectives: To investigate the influence of cold renal perfusion on renal function and clinical outcomes in cases where the renal ischemia time exceeded 30 min during pararenal and juxtarenal abdominal aortic aneurysm (P/JAAA) surgery. Methods and Results: Fifty-four patients who underwent open repair for P/JAAAs were retrospectively analyzed. Thirty-nine patients received renal perfusion with cold Ringer’s solution (perfusion group) and 15 patients did not receive renal perfusion (non-perfusion group). There were no significant differences in preoperative serum creatinine level (Cr) (1.08 ± 0.42 vs. 1.35 ± 0.71 mg/dL, p = 0.09), percentage of patients with Cr > 2 mg/dL [2/38 (5%) vs. 2/15 (13%), p = 0.8], and renal ischemia time during proximal aortic clamping (49 ± 21 vs. 47 ± 11 min;p = 0.8) between the groups. Postoperative Cr was significantly lower in the perfusion group than in the non-perfusion group (1.48 ± 0.76 vs. 2.23 ± 1.21 mg/dL, p < 0.01). The percentage of patients with postoperative Cr > 2 mg/dL was also significantly lower in the perfusion group than in the non-perfusion group [5 (13%) vs. 7 (47%), p < 0.01)]. At discharge, Cr returned to preoperative levels in both groups. All patients were discharged from the hospital without incidents. Conclusion: Renal artery perfusion with cold Ringer’s solution clearly reduced the deterioration of postoperative renal function compared to non-renal perfusion.

Fenestrated endovascular aortic repair for juxtarenal abdominal aortic aneurysm

Background Endovascular stent-graft with fenestration can improve proximal sealing in patients with juxtarenal abdominal aortic aneurysm （JAAA）. The purpose of this study was to describe our primary experience and evaluate the safety and efficacy of fenestrated device for JAAA in high-risk patients. Methods Between March 2011 and May 2012, nine male patients （mean age, （79.6±8.6） years） with asymptomatic JAAAs underwent elective deployment of the Zenith fenestrated stent-grafts at a single institution. All patients were treated in the hybrid operating room under general anesthesia. Follow-up computed tomography angiography （CTA） was routinely performed before discharge, at 3, 6, and 12 months and annually thereafter. Results Procedural success was achieved in all cases. Total sixteen small fenestrations, two large fenestrations and eight scallops were used. Intra-operative complications occurred in four patients, which included one proximal type I endoleak, two type II endoleaks, and one renal artery dissection. The mean hospital stay was （8.9±1.4） days, mean blood loss was （360.5±46.8） ml, and mean iodinated contrast volume was （230.6±58.3） ml. The mean follow-up time was （7.6±4.2） months. The visceral graft patency was 100% until now. One patient had an increase of serum creatinine of more than 30%, but did not require dialysis. No patients died, no stent fractured, and migration were diagnosed during the follow-up. Conclusions The early results of fenestrated device for high-risk patients with complex JAAAs are satisfactory. However, long-term fenestrated graft durability and branch vessel patency remain to be determined.

Antegrade in situ laser fenestration of aortic stent graft during endovascular aortic repair:A case report

BACKGROUND The endovascular repair of juxtarenal abdominal aortic aneurysms(JAAA)usually requires combination treatment with various stent graft modifications to preserve side branch patency.As a feasible technique,according to the situation,antegrade in situ laser fenestration still needs to be improved.CASE SUMMARY This report describes a case that was successfully treated with endovascular repair facilitated by antegrade in situ laser fenestration while maintaining renal arterial flow.Laser fenestration was performed using a steerable sheath positioned in the stent graft lumen in front of the renal artery ostium.With the bare stent region unreleased,renal artery perfusion could be maintained and accurate positioning could be achieved by angiography in real time.CONCLUSION This study suggests the feasibility and short-term safety of this novel antegrade in situ laser fenestration technique for select JAAA patients.