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Related Experiment Videos

Sibling risks of abdominal aortic aneurysm

P A Baird1, A D Sadovnick, I M Yee

  • 1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.

Lancet (London, England)
|September 2, 1995
PubMed
Summary
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First-degree relatives of abdominal aortic aneurysm (AAA) patients have a significantly higher risk of developing AAA. Early screening via ultrasound is recommended for siblings of AAA patients due to earlier onset and increased prevalence.

Area of Science:

  • Vascular Surgery
  • Genetics
  • Epidemiology

Background:

  • Abdominal aortic aneurysm (AAA) risk is elevated in first-degree relatives.
  • Familial aggregation of AAA suggests a genetic component.

Purpose of the Study:

  • To investigate the risk and age of onset of AAA in siblings of AAA patients compared to controls.
  • To evaluate the utility of ultrasound screening in this high-risk group.

Main Methods:

  • A 3-year prospective study comparing siblings of AAA probands (n=427) with siblings of control patients (n=451).
  • Genetic information gathered via interviews; affected status determined by medical record verification.
  • Ultrasound screening performed on a subset of siblings and controls.

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Main Results:

  • Siblings of AAA probands had a higher prevalence of AAA (4.4%) than control siblings (1.1%).
  • Lifetime cumulative risk of AAA at age 83 was higher for probands' siblings (11.7%) vs. controls' siblings (7.5%).
  • Ultrasound revealed significantly higher AAA prevalence in probands' siblings (19%) compared to controls (8%), with earlier onset observed.

Conclusions:

  • Familial factors significantly influence the age of onset and risk of abdominal aortic aneurysm.
  • Routine ultrasound screening is recommended for siblings of patients diagnosed with AAA to facilitate early detection.