Hepatitis C as a risk factor for carotid atherosclerosis - a systematic review.

Summary Background Observational studies on the association of chronic hepatitis C with carotid atherosclerosis have yielded varying results. In addition, previous related systematic reviews were limited in synthesis. By more careful selection and further synthesis, we summarize current body of evidence on the relationship between chronic hepatitis C and carotid atherosclerosis. Methods All published observational studies related to the topic identified by systematic searches of PubMed and Scopus were screened based on diagnosis of chronic hepatitis C and diagnosis and estimation of the risk of a carotid atherosclerosis-related outcome. Selected studies were subjected to quality assessment, and eligible studies were used in subsequent narrative and quantitative syntheses. Results The initial search identified 190 unique publications, which were narrowed by preliminary review to 16 potentially relevant original articles. After quality assessment, seven studies were eligible and were used in narrative synthesis. Five studies assessed the risk of increased carotid intimal media thickening using B mode ultrasonography; five studies assessed the risk of carotid plaque formation using B mode ultrasonography. Five of these studies were used in subsequent meta-analysis. The risk of a person with chronic hepatitis C developing carotid intimal media thickening is about 4·03 times the risk of an uninfected person. The risk of a person with chronic hepatitis C developing carotid plaque is about 3·94 times the risk of an uninfected person. Conclusion Current evidence shows that hepatitis C virus (HCV) or factors associated with HCV infection can promote the occurrence and progression of carotid atherosclerosis.