Comparison of the effect of hyaluronic acid and estrogen on atrophic vaginitis in menopausal women: A systematic review
This systematic review was conducted to compare the effectiveness of hyaluronic acid and estrogen on symptoms of atrophic vaginitis (primary outcomes) and corresponding side effects (secondary outcome). We reviewed all parallel clinical trials, systematically, to compare the effectiveness of hyaluronic acid and estrogen on atrophic vaginitis. We searched Pubmed, Embase, Web of Sciences, Cochrane library, Scopus, Google Scholar, Magiran, Scientific Information Database (Iran) and Iranian Registry of Clinical Trials, from inception to July 2018 and the reference lists of retrieved articles. Two reviewers used the Cochrane collaboration tool to assess the risk of bias independently. Five parallel controlled trials with 372 participants were included in the present systematic review. One trial reported estrogen superiority to hyaluronic acid in improving the symptoms of atrophic vaginitis. Three trials failed to show a significant statistical difference between the intervention groups. Only a trial with a high risk of bias in random allocation and blinding indicated that hyaluronic acid was more effective than estrogen in improving the symptoms of atrophic vaginitis. Hyaluronic acid is an effective drug with few side effects for the treatment of atrophic vaginitis symptoms; however, better designed trials are required to show the statistical superiority of hyaluronic acid to vaginal estrogen.