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Related Concept Videos

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Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...
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Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
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Related Experiment Video

Updated: Jun 12, 2026

An Approach to Point-Of-Care Ultrasound Evaluation of the Abdominal Aorta
07:12

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Published on: September 8, 2023

Internal or external wall diameter for abdominal aortic aneurysm screening?

A Thapar1, D Cheal, T Hopkins

  • 1Department of Vascular Surgery, Brighton & Sussex University Hospitals, Brighton, UK. a.thapar09@imperial.ac.uk

Annals of the Royal College of Surgeons of England
|June 4, 2010
PubMed
Summary

Abdominal aortic aneurysm (AAA) screening measurements of internal wall diameter underestimate aneurysm size by 6 mm compared to external wall measurements. This difference and greater variability in internal measurements may delay AAA detection and treatment.

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Area of Science:

  • Vascular Surgery
  • Medical Imaging
  • Public Health Screening

Background:

  • The UK's national abdominal aortic aneurysm (AAA) screening programme measures internal wall diameter.
  • Current UK intervention criteria rely on external wall diameter measurements.
  • A discrepancy exists between these two measurement methods, necessitating clinical evaluation.

Purpose of the Study:

  • To determine the clinical significance of the difference between internal and external wall diameter measurements in abdominal aortic aneurysms.
  • To assess the impact of measurement methodology on AAA detection and treatment criteria.

Main Methods:

  • Fifty patients in an aneurysm surveillance program underwent ultrasound scans.
  • Two experienced vascular scientists performed measurements, blinded to each other's results.
  • Maximum anteroposterior internal and external wall diameters were measured.

Main Results:

  • A median difference of 6-7 mm was observed between internal and external diameters.
  • This difference was statistically significant (P < 0.0002).
  • External wall diameter measurements exhibited less interobserver variability (3 mm vs 6 mm).

Conclusions:

  • Internal wall diameter measurements used in AAA screening underestimate aneurysm size by approximately 6 mm.
  • Internal measurements show greater variability compared to external measurements.
  • Understanding these differences is crucial to prevent delays in AAA detection and treatment.