Retrospective review of abdominal aortic aneurysm deaths in New Zealand: what proportion of deaths is potentially preventable by a screening programme in the contemporary setting?

Patient Perceptions of Surveillance of Small Abdominal Aortic Aneurysms in the Over 85s

BACKGROUND

Recently instigated local practice for patients with small abdominal aortic aneurysms (AAAs) involves contacting all patients, aged ≥85 years, to discuss with them the advantages and disadvantages of removal from surveillance. However, reasons why patients opt to remain on, or come off, surveillance, are currently unknown. The present study's objective is to explore patient perception of surveillance decision-making.

METHODS

A mixed-methods exploratory evaluation was undertaken using patient feedback obtained from a telephone survey. All patients aged ≥85 years, who had a consultation regarding ongoing surveillance of small AAAs (30-49 mm), and consented, were contacted by researchers, who conducted semi-structured interviews concerning factors influencing decision-making.

RESULTS

A total of 24 patients (20 male; mean age = 86.9 years) were interviewed; 16 of 24 (66%) had opted to remain on surveillance, with no age difference between those opting in or out. Most felt surveillance was important (91%), and that it made them feel safer (73%). The majority (73%) thought they knew what happened when their AAA reached threshold (5.5 cm), what happened when a threshold AAA is not fixed (64%), and how major AAA surgery is (59%). However, actual knowledge was poor: most (91%) correctly understood surgery was major, but 56% thought that threshold AAA meant certain death or rupture; and 38% thought immediate surgery was required. Thematic analysis expounded patients' beliefs regarding surveillance, which were summarized in 3 distinct subgroups: reliance on professionals' opinions, needing peace of mind, and poor understanding.

CONCLUSIONS

While most patients find surveillance reassuring, patient knowledge of AAA management at threshold is poor, potentially impacting surveillance decision-making. Elderly patients, with small AAAs contemplating ongoing surveillance, need to be better informed about AAA management at threshold to support shared decision-making.

Thirty-nine percent of patients with a ruptured abdominal aortic aneurysm (AAA) have an incidentally detected AAA prior to rupture

INTRODUCTION

Abdominal aortic aneurysm (AAA) screening has been offered to 65-year-old men living in Oslo, Norway, since May 2011. A significant number of AAA-related deaths occurred in individuals who are not eligible for screening. The primary aim of this study was to describe the group of patients admitted to Oslo University Hospital with a ruptured AAA after the implementation of the local AAA screening project. The following parameters were investigated: AAA detection prior to rupture, surveillance status, eligibility for screening and comorbidities. We also sought to compare outcomes (repair rates and 30-day mortality) between patients with and without an AAA detected prior to rupture.

METHODS

This cohort study included patients admitted acutely to Oslo University Hospital due to a symptomatic or ruptured AAA in the period January 2011 to December 2022. Data on demographics, prior AAA detection, surveillance status, treatment and mortality were collected retrospectively through electronic medical records.

RESULTS

We identified 200 patients with a symptomatic or ruptured AAA, among which 79 (40%) had an AAA detected prior to rupture - one (1%) through screening and 78 (39%) incidentally. Up to 30% of the incidentally detected AAAs were not under any surveillance. Six patients were found eligible for screening: one had attended, three were non-attenders and two had not been invited. Patients with an incidentally detected AAA prior to rupture had a more advanced age and a significantly higher degree of comorbidities than patients without a previously detected AAA, and the repair rates in these groups were 56% and 84% respectively (p < 0.001). Adjusted for comorbidities and risk factors, the odds ratio for repair among patients with incidentally detected AAA was 0.56 (p = 0.292). The 30-day mortality was not significantly different between the two groups (p = 0.097).

CONCLUSION

Most patients with a ruptured AAA were not eligible for screening, but 39% of the patients had an incidentally detected AAA prior to rupture. Standardized reporting and follow-up of incidentally detected AAAs is thus identified as an additional measure to organized screening in the effort to reduce AAA-related mortality.

Use of radiological information system data in Clinical Portal database to screen for missed abdominal aortic aneurysms

INTRODUCTION

New Zealand lacks a formal abdominal aortic aneurysm screening programme and owing to its rural nature, many patients have limited access to vascular surgery. Patients with vascular emergencies often have limited treatment options locally, especially if they present perimortem. In our small hospital in Whanganui, with the nearest vascular centre more than 150km away, there are cases of aneurysms diagnosed incidentally on radiology reporting but lost to follow-up.

METHODS

Clinical Portal (CP) is a widely used patient-centred dashboard for viewing health information that is managed by Orion Health. A search strategy utilising the CP common database was devised that aimed to find aneurysms which were not followed up. This search was performed retrospectively for all imaging within a 5-month period.

RESULTS

Some 294 scans were flagged and 53 patients with aneurysms were found. Of these patients, 36 had follow-up by the ordering provider and 17 (32%) were found to have been lost to follow-up.

CONCLUSIONS

Our pilot study demonstrated high rates of loss to follow-up and a lack of communication of important health information across multiple health disciplines in the region, and represents a potential method for identifying 'lost' aneurysms. For patients in rural communities, this may be critical to preventing future complications from aneurysmal disease.

Screening Older Adult Men for Abdominal Aortic Aneurysm: A Scoping Review

Abdominal aortic aneurysm (AAA) is a potentially fatal condition predominantly affecting older adult men (60 years or over). Based on evidence, preventative health-care guidelines recommend screening older males for AAA using ultrasound. In attempts to reduce AAA mortality among men, screening has been utilized for early detection in some Western countries including the UK and Sweden. The current scoping review includes 19 empirical studies focusing on AAA screening in men. The findings from these studies highlight benefits and potential harms of male AAA screening. The benefits of AAA screening for men include decreased incidence of AAA rupture, decreased AAA mortality, increased effectiveness of elective AAA repair surgery, and cost-effectiveness. The potential harms of AAA screening included lack of AAA mortality reduction, negative impacts on quality of life, and inconsistent screening eligibility criteria being applied by primary care practitioners. The current scoping review findings are discussed to suggest changes to AAA screening guidelines and improve policy and practice.