| Summary: | <h4>Objectives</h4>This systematic review and meta-analysis aims to determine the current evidence on risk factors for type II endoleaks after endovascular aneurysm repair (EVAR).<h4>Materials and methods</h4>A systematic literature search was carried out for studies that evaluated the association of demographic, co-morbidity, and other patient-determined factors with the onset of type II endoleaks. Pooled prevalence of type II endoleaks after EVAR was updated.<h4>Results</h4>Among the 504 studies screened, 45 studies with a total of 36,588 participants were included in this review. The pooled prevalence of type II endoleaks after EVAR was 22% [95% confidence interval (CI), 19%-25%]. The main factors consistently associated with type II endoleaks included age [pooled odds ratio (OR), 0.37; 95% CI, 0.31-0.43; P<0.001], smoking (pooled OR, 0.71; 95% CI, 0.55-0.92; P<0.001), patent inferior mesenteric artery (pooled OR, 1.98; 95% CI, 1.06-3.71; P = 0.012), maximum aneurysm diameter (pooled OR, 0.23; 95% CI, 0.17-0.30; P<0.001), and number of patent lumbar arteries (pooled OR, 3.07; 95% CI, 2.81-3.33; P<0.001). Sex, diabetes, hypertension, anticoagulants, antiplatelet, hyperlipidemia, chronic renal insufficiency, types of graft material, and chronic obstructive pulmonary diseases (COPD) did not show any association with the onset of type II endoleaks.<h4>Conclusions</h4>Clinicians can use the identified risk factors to detect and manage patients at risk of developing type II endoleaks after EVAR. However, further studies are needed to analyze a number of potential risk factors.
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