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Journal ArticleDOI

Meta-analysis of individual patient data to examine factors affecting growth and rupture of small abdominal aortic aneurysms

TLDR
Surveillance is a common management strategy for small abdominal aortic aneurysm (AAA) (3·0–5·4 cm in diameter) because individual characteristics, other than diameter, may influence aneurYSm growth or rupture rates.
Abstract
Background: Surveillance is a common management strategy for small abdominal aortic aneurysm (AAA) (3·0–5·4 cm in diameter). Individual characteristics, other than diameter, may influence aneurysm growth or rupture rates. Methods: Individual data were collated from 15 475 people under follow-up for a small aneurysm in 18 studies. The influence of co-variables (including demographics, medical and drug history) on aneurysm growth and rupture rates (analysed using longitudinal random-effects modelling and survival analysis with adjustment for aneurysm diameter) were summarized in an individual patient meta-analysis. Results: The mean aneurysm growth rate of 2·21 mm/year was independent of age and sex. Growth rate was increased in smokers (by 0·35 mm/year) and decreased in patients with diabetes (by 0·51 mm/year). Mean arterial pressure had no effect and antihypertensive or other cardioprotective medications had only small, non-significant effects on aneurysm growth, consistent with the observation that calendar year of enrolment was not associated with growth rate. Rupture rates were almost fourfold higher in women than men (P < 0·001), were double in current smokers (P = 0·001) and increased with higher blood pressure (P = 0·001). Conclusion: Follow-up schedules for individuals with a small AAA may need to consider diabetes and smoking, in addition to aneurysm diameter. The differing risk factors for growth and rupture suggest that a lower threshold for surgical intervention in women may be justified. No single drug used for cardiovascular risk reduction had a major effect on the growth or rupture of small aneurysms. Copyright © 2012 British Journal of Surgery Society Ltd. Published by John Wiley & Sons, Ltd.

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Journal ArticleDOI

Measuring inconsistency in meta-analyses

TL;DR: A new quantity is developed, I 2, which the authors believe gives a better measure of the consistency between trials in a meta-analysis, which is susceptible to the number of trials included in the meta- analysis.
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Meta-Analysis in Clinical Trials*

TL;DR: This paper examines eight published reviews each reporting results from several related trials in order to evaluate the efficacy of a certain treatment for a specified medical condition and suggests a simple noniterative procedure for characterizing the distribution of treatment effects in a series of studies.
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The Multicentre Aneurysm Screening Study (MASS) into the effect of abdominal aortic aneurysm screening on mortality in men: a randomised controlled trial.

TL;DR: The results provide reliable evidence of benefit from screening for abdominal aortic aneurysms, and the Multicentre Aneurysm Screening Study was designed to assess whether or not such screening is beneficial.
Journal ArticleDOI

Immediate repair compared with surveillance of small abdominal aortic aneurysms.

TL;DR: The rate of death from any cause, the primary outcome, was not significantly different in the two groups (relative risk in the immediate-repair group as compared with the surveillance group), and the rate of repair had been performed in 92.6 percent of the patients in the immediately- Repair group and 61.6% of those in the Surveillance group.
Journal ArticleDOI

Prevalence and Associations of Abdominal Aortic Aneurysm Detected through Screening

TL;DR: The Aneurysm Detection and Management (ADAM) study is an ongoing randomized clinical trial comparing two strategies for the management of AAA in patients 50 to 79 years of age with asymptomatic AAAs.
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