In their Editorials, Greenhalgh and Powell(1) cited a recent Cochrane
review(2)
which reported that screening asymptomatic people for abdominal aortic
aneurysm (AAA) significantly reduced not all-cause but AAA-related
mortality
in men aged 65-79 years. The review,(2) however, excluded the more recent
over 15-year follow-up in the Chichester study,(3) median 9.6-year follow-
up in the Viborg Country study,(4) and mean 7.1-year follow-up in the
Multicentre Aneurysm Screening Study (MASS).(5) Therefore, we(6)
performed
a meta-analysis of currently available longest follow-up results (both AAA
-
related and all-cause mortality) of randomized controlled studies of
screening for AAA in men.
Our comprehensive search identified four reports: the Chichester
study (over
15-year follow-up),(3) the Viborg Country study (median 9.6-year follow-
up),
(4) the Western Australia study (median 3.6-year follow-up),(7) and the
MASS
(mean 7.1-year follow-up).(5) Pooled analysis of the four reports
demonstrated a statistically significant reduction in both AAA-related
(risk
difference, |0.25%; 95% CI, |0.46% to |0.04%) and all-cause (risk
difference, |
1.06%; 95% CI, |1.81% to |0.31%) mortality with screening relative to
control
in a random-effects model.(6)
In conclusion, our meta-analysis,(6) an update of the Cochrane
review,(2)
demonstrated that screening for AAA significantly reduced not merely AAA-
related but also all-cause mortality in men aged 65 years.
1 Greenhalgh R, Powell J. Screening for abdominal aortic aneurysm.
BMJ
2007; 335:732-3.
2 Cosford PA, Leng GC. Screening for abdominal aortic aneurysm.
Cochrane Database Syst Rev 2007;(2):CD002945.
3 Ashton HA, Gao L, Kim LG, Druce PS, Thompson SG, Scott RA. Fifteen
-
year follow-up of a randomized clinical trial of ultrasonographic
screening for
abdominal aortic aneurysms. Br J Surg 2007;94:696-701.
4 Lindholt JS, Juul S, Fasting H, Henneberg EW. Preliminary ten year
results from a randomised single centre mass screening trial for abdominal
aortic aneurysm. Eur J Vasc Endovasc Surg 2006;32:608-14.
5 Kim LG, P Scott RA, Ashton HA, Thompson SG; Multicentre Aneurysm
Screening Study Group. A sustained mortality benefit from screening for
abdominal aortic aneurysm. Ann Intern Med 2007;146:699-706.
6 Takagi H, Tanabashi T, Kawai N, Umemoto T. Screening for abdominal
aortic aneurysm reduces both aneurysm-related and all-cause mortality. J
Vasc Surg (in press).
7 Norman PE, Jamrozik K, Lawrence-Brown MM, Le MT, Spencer CA, Tuohy
RJ, et al. Population based randomised controlled trial on impact of
screening
on mortality from abdominal aortic aneurysm. BMJ 2004;329:1259.
Competing interests:
None declared