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  • Title: Meta-analysis of the risk of metachronous hernia in infants and children.
    Author: Miltenburg DM, Nuchtern JG, Jaksic T, Kozinetz CA, Brandt ML.
    Journal: Am J Surg; 1997 Dec; 174(6):741-4. PubMed ID: 9409609.
    Abstract:
    BACKGROUND: Inguinal herniorrhaphy is the most common general surgical procedure performed in children. The presence of a contralateral patent processus vaginalis forms the basis of the recommendation for contralateral exploration in patients undergoing unilateral herniorrhaphy. However, a patent processus vaginalis does not necessarily go on to become a clinically apparent inguinal hernia. METHODS: All published pediatric series, in which patients underwent unilateral inguinal hernia repair and were evaluated for the development of a metachronous hernia, were included. The incidence of and risk factors associated with development a metachronous hernia were evaluated with meta-analysis. RESULTS: There were 15,310 patients ranging in age from birth to 16 years, including premature infants. Of these, 1,062 patients (7%) developed a metachronous hernia. Gender and age were not risk factors. There was an 11% risk of metachronous hernia if the original hernia was on the left side, a risk that was 50% greater than if the original hernia was on the right. Of patients who developed a metachronous hernia, 90% did so within 5 years. The complication rate of metachronous hernia was 0.5%. CONCLUSION: There is no role for routine contralateral groin exploration. High-risk infants and children, especially those who undergo left inguinal herniorrhaphy, may benefit from contralateral groin exploration. If a patent processus vaginalis is found, it should be ligated. Patients who do not undergo contralateral groin exploration should be followed up for 5 years.
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