• Joseph R Davidson, Danielle Franklin, Sacheen Kumar, Borzoueh Mohammadi, Khaled Dawas, Simon Eaton, Joe Curry, Paolo De Coppi, and Nima Abbassi-Ghadi.
• Stem Cells and Regenerative Medicine Section, University College London-Great Ormond Street Institute of Child Health, London, United Kingdom; Department of Pediatric Surgery, Great Ormond Street Hospital for Children, London, United Kingdom. Electronic address: joseph.davidson@doctors.org.uk.
• J. Thorac. Cardiovasc. Surg. 2020 Sep 1; 160 (3): 858-866.

BackgroundARS has been adopted in select patients with lung transplant for the past 2 decades in many centers. Outcomes have been reported sporadically. No pooled analysis of retrospective series has been performed.ObjectiveThis review and pooled analysis sought to demonstrate objective evidence of improved graft function in lung transplant patients undergoing antireflux surgery (ARS).MethodsIn accordance with Meta-analyses of Observational Studies in Epidemiology guidelines, a search of PubMed Central, Medline, Google Scholar, and Cochrane Library databases was performed. Articles documenting spirometry data pre- and post-ARS were reviewed and a random-effects model meta-analysis was performed on forced expiratory volume in 1 second (FEV1) values and the rate of change of FEV1.ResultsSix articles were included in the meta-analysis. Regarding FEV1 before and after ARS, we observed a small increase in FEV1 values in studies reporting raw values (2.02 ± 0.89 L/1 sec vs 2.14 ± 0.77 L/1 sec; n = 154) and % of predicted (77.1% ± 22.1% vs 81.2% ± 26.95%; n = 45), with a small pooled Cohen d effect size of 0.159 (P = .114). When considering the rate of change of FEV1 we observed a significant difference in pre-ARS compared with post-ARS (-2.12 ± 2.76 mL/day vs +0.05 ± 1.19 mL/day; n = 103). There was a pooled effect size of 1.702 (P = .013), a large effect of ARS on the rate of change of FEV1 values.ConclusionsThis meta-analysis of retrospective observational studies demonstrates that ARS might benefit patients with declining FEV1, by examining the rate of change of FEV1 during the pre- and postoperative periods.Copyright © 2019 The American Association for Thoracic Surgery. Published by Elsevier Inc. All rights reserved.

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