Impact of an emergency endovascular aneurysm repair protocol on 30-day ruptured abdominal aortic aneurysm mortality

Local Versus General Anesthesia in Emergency Endovascular Repair of Infrarenal Abdominal Aortic Aneurysm

BACKGROUND

While general anesthesia (GA) has been the common choice of anesthesia for patients undergoing endovascular aneurysm repair (EVAR), local anesthesia (LA) has been proposed as an effective alternative for eligible patients. However, the choice of anesthesia in emergency EVAR situations remains less explored. Therefore, this study aimed to perform a retrospective analysis to compare the 30-day outcomes of patients who underwent emergency infrarenal EVAR receiving either LA or GA.

METHODS

Patients who underwent emergency infrarenal EVAR were identified in the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) targeted database from 2012 to 2022. Exclusion criteria included age less than 18 years, acute intraoperative conversion to open surgery, and intraoperative anesthesia conversion. The 1:1 propensity-score matching and multivariable logistic regression were separately used to balance preoperative factors between patients who received LA and GA. Thirty-day postoperative outcomes were examined.

RESULTS

There were 258 (14.58%) and 1512 (85.42%) patients who underwent emergency EVAR under LA and GA, respectively. After multivariable analysis, patients who were under LA had lower mortality (11.24% vs 13.96%, aOR=0.61, 95% confidence interval [CI]=0.395-0.944, p=0.03), pulmonary complications (10.85% vs 17.59%, aOR=0.495, 95% CI=0.322-0.76, p<0.01), renal complications (5.04% vs 7.47%, aOR=0.545, 95% CI=0.303-0.983, p=0.04), wound complications (0.39% vs 3.64%, aOR=0.089, 95% CI=0.012-0.649, p=0.02), and 30-day readmission (6.59% vs 11.24%, aOR=0.564, 95% CI=0.334-0.953, p=0.03). Moreover, patients under LA had shorter operative time (p<0.01) and shorter length of stay (p=0.02).

CONCLUSION

The LA is associated with better 30-day outcomes in emergency infrarenal EVAR. Therefore, in emergency EVAR, it may be advisable to consider LA over GA for eligible patients. Prospective studies in the future can be warranted to further support this anesthesia practice.

CLINICAL IMPACT

The choice of anesthesia in emergency endovascular aneurysm repair (EVAR) remains unexplored. This study performed a retrospective analysis to compare the 30-day outcomes of patients who underwent emergency infrarenal EVAR receiving local anesthesia (LA) or general anesthesia (GA). After propensity-score matching/multivariable analysis to balance preoperative differences, patients under LA were found to have lower 30-day mortality, pulmonary, renal, and wound complications, 30-day readmission, shorter operative time, and shorter hospital stay. In emergency EVAR, it may be advisable to consider LA over GA for eligible patients. Prospective studies in the future can be warranted to further support this anesthesia practice.

Hostile neck anatomy contributes to higher rates of reintervention following endovascular aortic repair for ruptured infrarenal abdominal aortic aneurysm

INTRODUCTION

Ruptured abdominal aortic aneurysms (AAA) presenting with hostile neck anatomy can represent a challenge in surgical decision-making. We hypothesized that, patients who require reinterventions have higher rates of compromised neck anatomy at initial presentation and may indicate a need for altered surveillance paradigm.

METHODS

Patients presenting with ruptured AAA to a single tertiary care institution from 2014 to 2021 were retrospectively reviewed. Those treated with infrarenal EVAR, with no prior aortic surgeries, and with available pre-operative computed tomography (CT) scans were included. Demographics, timing and type of reintervention, follow-up, and survival were collected. CT scans were assessed for hostile neck anatomy via measurements of diameter, length, angle, taper, bulge, calcification, and thrombus. Demographics, comorbidities, and neck anatomy of those with and without reintervention were compared using Fischer's Exact and Student's T-test. Survival was analyzed via Kaplan-Meier and log-rank test.

RESULTS

Eighty-nine patients were available for analysis, 37 of which met inclusion criteria. Intraoperative death occurred in 3 patients (8.1%) and 1 patient (2.7%) was intraoperatively converted to an open repair. Thirty-day and 1-year survival were 97% and 91%, respectively. The reintervention rate was 30% (n = 10), occurring at a median of 200 days (18-2053 days) after the index operation. All patients requiring reintervention met hostile neck criteria (p = .002) and had a statistically higher number of hostile neck criteria (1.80 vs 0.87, p = .03). Thirty percent (n = 3) of patients that received a reintervention had neck diameter greater than 3 cm, compared to zero patients in the non-reintervention group (p = .022). Proximal reinterventions (n = 5) had statistically higher neck diameters and neck angle compared to the non-reintervention group.

CONCLUSION

Infrarenal rEVAR is effective at preventing acute mortality despite specific anatomic considerations that may contribute to the higher reintervention rates, and therefore those parameters ought to be considered when following patients in the post-intervention period.

From Emergency Room to Operating Room: Multidisciplinary Simulation Training in Emergency Laparotomy for Ruptured Abdominal Aortic Aneurysm - Learning Outcomes and Costs

BACKGROUND

Opportunities to practice emergency laparotomy (EL) and open surgical repair (OSR) for a ruptured abdominal aortic aneurysm (rAAA) are limited. While simulation-based training (SBT) is effective in educating healthcare professionals in medical emergencies, SBT specifically in EL and OSR for rAAA is scarce. It takes a team to diagnose a patient with massive abdominal bleeding, such as in rAAA, to organize primary care, and to provide definite treatment without unnecessary delays. This study investigated the effects of multidisciplinary EL simulation training in OSR for rAAA, from the emergency room (ER) to the operating room (OR), on trainees' learning outcomes and the costs of the training.

METHODS

A total of 162 healthcare professionals in 21 simulated emergency laparotomy teams participated in a structured 2-hour course consisting of an introductory lecture and a simulation scenario followed by debriefing. Data were collected using a pre-post self-assessment questionnaire and the T-NOTECHS scale. Implementation costs and the cost of education were calculated.

RESULTS

Simulation training improved knowledge, skills, and attitudes of both physicians and nurses. Most of the non-technical skills studied were significantly enhanced in both professional groups. The total cost of the simulation training was €29 415, cost per team €1,400 and cost per participant €182.

CONCLUSIONS

Multidisciplinary EL simulation training in OSR for rAAA from the ER to the OR is effective in improving knowledge, skills, and attitudes, as well as non-technical skills among both physicians and nurses. The overall costs of training seem reasonable given the significant learning outcomes.

Endovascular Aortic Balloon control versus open Aortic cross Clamp in open ruptured abdominal Aortic aneurysm repair

BACKGROUND

To determine 30-day mortality of endovascular aortic balloon control compared with open aortic cross clamp in open surgical repair (OSR) of ruptured abdominal aortic aneurysms (rAAAs).

METHODS

A retrospective cohort review was performed of all adult patients who underwent OSR of an infrarenal rAAA between 2001 and 2018 at a single tertiary care center. A total of 174 patients were identified, of which 21 patients received endovascular aortic balloon control and 137 patients received an open aortic cross clamp. Primary outcome was 30-day mortality. Two-variable multivariate logistic regression was adjusted for preoperative blood pressure and age.

RESULTS

Endovascular aortic balloon control was nonsignificantly associated with lower mortality (adjusted odds ratio [OR] = 0.75 (95% confidence interval [CI] 0.24 to 2.38), P = 0.63), and when placed under local anesthesia showed a trend toward improved mortality (adjusted OR = 0.34 (95%CI 0.06 to 1.77), P = 0.19). Balloon placement under general anesthesia was nonsignificantly associated with worse mortality (adjusted OR = 2.50 (95%CI 0.35 to 9.13), P = 0.46).

CONCLUSIONS

There is no significant difference in mortality with the use of endovascular aortic balloon control in rAAA patients undergoing OSR, and it may be considered as an alternative approach to open aortic cross clamp in properly selected patients.

Exploiting endovascular aortic repair as a minimally invasive method - Nine years of experience in a non-university hospital

Background

At the introduction of endovascular aortic repair (EVAR) in 2013 in our non-university hospital, we established a quality registry to monitor our EVAR activity.

Purpose

To observe if we over time were able to exploit EVAR as a minimally invasive method in an elective as well as emergency setting, and to monitor our treatment quality in terms of complications, secondary interventions and mortality.

Material and methods

From November 2013 to March 2022, we treated 207 patients with EVAR, including six patients with rupture. Follow-up regimen was partly based on contrast-enhanced computer tomography, and partly on contrast-enhanced ultrasound in combination with plain radiography.

Results

During the observation period, the method of anesthesia changed from general, via spinal, to local anesthesia. The groin access changed from surgical cut down to percutaneous and the median length of postoperative stay decreased from 3 days to 1 day. EVAR on ruptured aneurysm was done for the first time in 2019. Endoleak was detected in 85 patients (42%) and 37 patients (18%) had one or more secondary interventions, of which 85% were endovascular. Estimated five-year survival was 72% in patients below 80 years of age and 45% in patients 80 years or older.

Conclusion

Nine years of experience enabled us to exploit EVAR's advantages as a minimally invasive method in an elective as well as emergency setting. Complications, secondary interventions and survival rates in our low volume non-university hospital matches results from larger vascular centers.

A protocol-based treatment for ruptured abdominal aortic aneurysm contributed to improving aorta-related mortality: a retrospective cohort study

BACKGROUND

Recent guidelines state that improving the survival rate of patients with ruptured abdominal aortic aneurysm (rAAA) requires a protocol or algorithm for the emergency management of these patients. We aimed to investigate whether introducing a protocol treatment for rAAA improves clinical outcomes compared with the pre-protocol strategy.

METHODS

At our institution, 92 patients treated for rAAA between June 2008 and August 2022 were retrospectively analyzed. In 2014, the protocol-based treatment was introduced comprising a transfer algorithm to shorten the time to proximal control, use of an endovascular occlusion balloon, strict indications for endovascular aortic aneurysm repair (EVAR) or open surgical repair, and perioperative care, including for abdominal compartment syndrome (ACS). Clinical outcomes were compared between the protocol and pre-protocol group, including operative status, all-cause mortality, and rAAA-related death at 30-day, in-hospital, and 1-year postoperative follow-ups.

RESULTS

Overall, 52 and 40 patients received the protocol-based and pre-protocol treatments, respectively. EVAR was more frequently performed in the protocol group. The rate of achieving time to proximal control was significantly faster, and the transfusion volume was lower in the protocol group. ACS occurred more frequently in the protocol group with a higher EVAR. No difference was found in all-cause mortality between the two groups. The protocol group exhibited fewer rAAA-related deaths than the pre-protocol group during the following time points: 30 days (9.6% vs. 22.5%), during the hospital stay (11.5% vs. 30.0%), and 1 year (14.5% vs. 31.5%).

CONCLUSIONS

The protocol-based treatment improved the survival rate of patients with rAAA.

The sandwich technique to preserve the internal iliac artery during EVAR for ruptured abdominal aortic aneurysm with congenital anomalies

Congenital abnormalities of the iliac artery are uncommon and often discovered incidentally during the diagnosis or treatment of peripheral vascular diseases such as abdominal aortic aneurysm (AAA) and peripheral arterial diseases. The endovascular treatment of infrarenal AAA can be complicated by anatomic abnormalities in the iliac arteries, such as the absence of the common iliac artery (CIA) or overly short bilateral common iliac arteries. We present a case of a patient with a ruptured AAA and bilateral absence of the CIA, successfully treated by endovascular intervention combined with preservation of the internal iliac artery using the sandwich technique.