Ultrasound Surveillance is Feasible After Endovascular Aneurysm Repair.

BACKGROUND: Surveillance after endovascular aneurysm repair (EVAR) is traditionally done with computed tomography angiography (CTA) scans that exposes patient to radiation, nephrotoxic contrast media, and potentially increased risk for cancer. Ultrasound (US) is less labor intensive and expensive and might thus provide a good alternative for CTA surveillance. The aim of this study was to evaluate in real-life patient cohorts whether US is able to detect post-EVAR aneurysm-related complications similarly to CTA. METHODS: This retrospective study compared the outcome of consecutive patients who underwent EVAR for intact abdominal aortic aneurysm and were surveilled solely by CTA (CTA-only cohort, n = 168) in 2000-2010 or by combined CTA and US (CTA/US cohort, n = 300) in 2011-2016, as a standard surveillance protocol in the department of vascular surgery, Helsinki University Hospital. The CTA-only patients were imaged at 1, 3, and 12 months and annually thereafter. The CTA/US patients were imaged with CTA at 3 and 12 months, US at 6 months and annually thereafter. If there were suspicion of >5 mm aneurysm growth, CTA scan was performed. The patients were reviewed for imaging data, reinterventions, aneurysm ruptures, and death until December 2018. The 2 groups were compared for secondary rupture, aneurysm-related and cancer-related death, reintervention related to abdominal aortic aneurysm, and maximum aneurysm diameter increase ≥5 mm. The mean follow-up in the CTA-only cohort was 67 months and in CTA/US cohort 43 months. RESULTS: The 2 cohorts were alike for basic characteristics and for the mean aneurysm diameter. The total number of CT scans for detecting aneurysm was 84.1/100 patient years in the CTA-only cohort compared to 74.5/100 patient years for US/CTA cohort. Forty percent of patients under combined CTA/US surveillance received 1 or more additional CTA scans. The 2 cohorts did not differ for 1-year, 5-year and 8-year freedom from aneurysm related death, secondary sac rupture, nor the incidence of rupture preventing interventions. CONCLUSIONS: Based on the follow-up data of this real-life cohort of 468 patients, combined surveillance with US and additional CTA either per protocol or due to suspicion of aneurysm-related complications had comparable outcome with sole CTA-surveillance. Thus, US can be considered a reasonable alternative for the CTA. However, our study showed also that the need of additional CTAs due to suspicion of endoleak or aneurysm nonrelated reasons is substantial.

A Population-Based Study of Abdominal Aortic Aneurysm Treatment in Finland 2000 to 2014.

BACKGROUND: In the event of rupture of an abdominal aortic aneurysm (AAA), mortality is very high. AAA prevalence and incidence of ruptures have been reported to be decreasing. The treatment of AAA has also undergone a change in recent decades with a shift toward endovascular aneurysm repair (EVAR). Our aim was to evaluate how these changes have affected the elective and emergency treatment of AAA and their results in Finland. METHODS: All patients treated for AAA in Finland, a country with a population of 5.5 million, during 2000 to 2014 were searched from the registry of the Finnish Institute for Health and Welfare. Data on all patients who had died of AAA during the same time period were obtained from Statistics Finland. The data were combined and analyzed. RESULTS: The annual incidence of ruptured AAA was 16.4 per 100 000 population over 50 years and decreased significantly during the study period. Over half of the 4949 patients who had a ruptured AAA died outside the hospital. Thirty-day mortality after emergency repair was 39.4%. Intact AAA repairs numbered 4956. The absolute number of annual repairs increased during the study period, and the use of EVAR became the dominant method of elective repair. Thirty-day mortality in elective AAA repair dropped significantly from 6.3% in 2000 to 2004 to 2.7% in 2010 to 2014 mostly because of the increased number of EVAR procedures with lower mortality. Long-term mortality in patients treated with EVAR was higher than in patients treated with open repair. Mortality after elective AAA repair was primarily attributable to cardiovascular causes, but there was a slightly higher proportion of AAA-related late deaths in patients treated with EVAR. CONCLUSIONS: Ruptured AAA incidence for men >65 years has declined by nearly 30% in Finland, likely because of the decrease in AAA prevalence. The treatment results have improved as well for both elective and emergency repair. Increased use of EVAR has resulted in a decrease of mortality after elective AAA repair, but results of open repair have improved as well. However, late mortality from elective EVAR is surprisingly high in comparison with open repair, which may have been exaggerated by patient selection.