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Improved reliability of ultrasonic surveillance of abdominal aortic aneurysms

Länne, T; Sandgren, T; Mangell, Peter LU ; Sonesson, Björn LU and Hansen, F (1997) In European Journal of Vascular and Endovascular Surgery 13(2). p.149-153
Abstract
OBJECTIVES: Small abdominal aortic aneurysms (AAA) are usually managed conservatively by serial ultrasound examinations to assess size. The development of the size of the AAA will determine whether the patient is a candidate for surgery. The precision of measurement is therefore of considerable importance. The aim of this study was to evaluate the accuracy and the reproducibility of a newly developed echo-tracking ultrasonic system in the size evaluation of AAA. DESIGN: Prospective study at a University Hospital. MATERIAL AND METHODS: An echo-tracking ultrasound system with a 3.5 MHz transducer was used in 54 patients with AAA. Thirty-six patients had repeated measurements by one technician to evaluate the intra-observer variability. In... (More)
OBJECTIVES: Small abdominal aortic aneurysms (AAA) are usually managed conservatively by serial ultrasound examinations to assess size. The development of the size of the AAA will determine whether the patient is a candidate for surgery. The precision of measurement is therefore of considerable importance. The aim of this study was to evaluate the accuracy and the reproducibility of a newly developed echo-tracking ultrasonic system in the size evaluation of AAA. DESIGN: Prospective study at a University Hospital. MATERIAL AND METHODS: An echo-tracking ultrasound system with a 3.5 MHz transducer was used in 54 patients with AAA. Thirty-six patients had repeated measurements by one technician to evaluate the intra-observer variability. In another 18 patients with aortic dilatation/AAA, the measurements were repeated by a second technician in a blinded fashion with calculation of inter-observer variability. The reproducibility was evaluated both using linear regression and plots according to the method described by Bland and Altman. RESULTS: The mean diameter of the aorta was 37 mm (range 21-51 mm). The coefficient of correlation of repetitive measurements with one observer was r = 0.99 and with two observers r = 0.99. The intra-observer variability was 0.78 mm (S.D.) and the inter-observer variability 0.93 mm (S.D.). The intra- and inter-observer coefficient of variation (CV) was 2-3%. CONCLUSIONS: The newly developed echo-tracking ultrasonography seems at present to be the most accurate and reliable method to follow the diameter of an abdominal aortic aneurysm detecting relevant changes in the diameter exceeding 2 mm (2 S.D.). Thus it fulfils the requirements both for follow-up of conservatively managed AAAs and endovascularly treated aneurysms. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ultrasonography, Echo-tracking, Abdominal aortic aneurysm, Aneurysm surveillance
in
European Journal of Vascular and Endovascular Surgery
volume
13
issue
2
pages
149 - 153
publisher
Elsevier
external identifiers
  • pmid:9091147
  • scopus:0030936871
ISSN
1532-2165
DOI
10.1016/S1078-5884(97)80011-1
language
English
LU publication?
yes
id
fc859c3d-e419-4675-8787-1b4cd0ac4d56 (old id 1112024)
date added to LUP
2008-07-21 11:45:21
date last changed
2017-01-01 06:49:11
@article{fc859c3d-e419-4675-8787-1b4cd0ac4d56,
  abstract     = {OBJECTIVES: Small abdominal aortic aneurysms (AAA) are usually managed conservatively by serial ultrasound examinations to assess size. The development of the size of the AAA will determine whether the patient is a candidate for surgery. The precision of measurement is therefore of considerable importance. The aim of this study was to evaluate the accuracy and the reproducibility of a newly developed echo-tracking ultrasonic system in the size evaluation of AAA. DESIGN: Prospective study at a University Hospital. MATERIAL AND METHODS: An echo-tracking ultrasound system with a 3.5 MHz transducer was used in 54 patients with AAA. Thirty-six patients had repeated measurements by one technician to evaluate the intra-observer variability. In another 18 patients with aortic dilatation/AAA, the measurements were repeated by a second technician in a blinded fashion with calculation of inter-observer variability. The reproducibility was evaluated both using linear regression and plots according to the method described by Bland and Altman. RESULTS: The mean diameter of the aorta was 37 mm (range 21-51 mm). The coefficient of correlation of repetitive measurements with one observer was r = 0.99 and with two observers r = 0.99. The intra-observer variability was 0.78 mm (S.D.) and the inter-observer variability 0.93 mm (S.D.). The intra- and inter-observer coefficient of variation (CV) was 2-3%. CONCLUSIONS: The newly developed echo-tracking ultrasonography seems at present to be the most accurate and reliable method to follow the diameter of an abdominal aortic aneurysm detecting relevant changes in the diameter exceeding 2 mm (2 S.D.). Thus it fulfils the requirements both for follow-up of conservatively managed AAAs and endovascularly treated aneurysms.},
  author       = {Länne, T and Sandgren, T and Mangell, Peter and Sonesson, Björn and Hansen, F},
  issn         = {1532-2165},
  keyword      = {Ultrasonography,Echo-tracking,Abdominal aortic aneurysm,Aneurysm surveillance},
  language     = {eng},
  number       = {2},
  pages        = {149--153},
  publisher    = {Elsevier},
  series       = {European Journal of Vascular and Endovascular Surgery},
  title        = {Improved reliability of ultrasonic surveillance of abdominal aortic aneurysms},
  url          = {http://dx.doi.org/10.1016/S1078-5884(97)80011-1},
  volume       = {13},
  year         = {1997},
}