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J Vasc Surg. 2010 Oct;52(4):1103-8. doi: 10.1016/j.jvs.2010.02.283. Epub 2010 Jun 11.

A further meta-analysis of population-based screening for abdominal aortic aneurysm.

Author information

  • 1Department of Cardiovascular Surgery, Shizuoka Medical Center, Shizuoka, Japan. kfgth973@ybb.ne.jp

Abstract

PURPOSE:

It remains unclear whether population-based screening for abdominal aortic aneurysm (AAA) in men reduces all-cause long-term mortality. We performed an updated meta-analysis of randomized controlled trials of AAA screening for prevention of long-term mortality in men.

METHODS:

To identify all randomized controlled trials of population-based AAA screening with long-term (≥ 10 year) follow-up in men, MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials were searched through June 2009. Data regarding AAA-related and all-cause mortality (including Cox regression hazard ratios [HRs] and 95% confidence intervals [CIs]) were abstracted from each individual study. For each study, data regarding mortality in both the screening and control groups were used to generate odds ratios (ORs) and 95% CIs. Study-specific estimates were combined using inverse variance-weighted averages of logarithmic ORs or HRs (or risk ratios where no HR was reported) in both fixed- and random-effects models.

RESULTS:

Our search identified four randomized controlled trials of population-based AAA screening with long-term follow-up in men aged ≥ 65 years. Pooled analysis demonstrated a statistically significant reduction in AAA-related mortality (random-effects OR, 0.55; 95% CI, 0.36 to 0.86; P = .008; P for heterogeneity = .01; absolute risk reduction [ARR], 4 per 1000; number needed to screen [NNS], 238; random-effects HR, 0.55; 95% CI, 0.35 to 0.86; P = .009; P for heterogeneity = .009) and revealed a statistically nonsignificant reduction (but a strong trend toward a significant reduction) in all-cause mortality (fixed-effects OR, 0.98; 95% CI, 0.95 to 1.00 [1.001]; P = .06; P for heterogeneity = .93; ARR, 5 per 1000; NNS, 217; fixed-effects HR, 0.98; 95% CI, 0.96 to 1.00 [1.0001]; P ≥ .05 [P = .052]; P for heterogeneity = .74) with AAA screening relative to control.

CONCLUSION:

The results of our analysis suggest that population-based screening for AAA reduces AAA-related long-term mortality by 4 per 1000 over control in men aged ≥ 65 years. Whereas, screening for AAA shows a strong trend toward a significant reduction in all-cause long-term mortality by 5 per 1000, which does not narrowly reach statistical significance.

Copyright © 2010 Society for Vascular Surgery. Published by Mosby, Inc. All rights reserved.

PMID:
20541347
[PubMed - indexed for MEDLINE]
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