Utilization of Anti-reflux Treatment and Course of Illness Leading to Reoperation After Anti-reflux Surgery in a National Population-based Cohort

Aim The purpose of this study is to investigate course of illness leading to reoperation after primary anti-reflux surgery and investigate the utilization of anti-reflux treatment, both medical and surgical, in the period 2000-2017

Methods The study is a two-part register-based cohort study based on data from The National Patient Registry, The Civic Registry and Danish Anaesthesia Database in the period 1996-2017. The two individual parts of the study concerns the same population.

The population is defined as all adult Danish patients undergoing anti-reflux surgery (Nomesco: KJBC00, KJBC01, KJBC02, KJBW96, KJBW97) from 2000-2017 identified from The National Patient Register.

Age, sex, Charlson Comorbidity Index at date of surgery and length of stay in relation to any surgery and any surgical or endoscopic procedure performed after anti-reflux surgery (including diagnosis 30 days postoperatively to establish possible morbidity) are derived from the National Patient Registry.

ASA-score, weight, height, use of alcohol or tobacco and priority of any surgery (emergency or planned) during the study period are retrieved from The Danish Anaesthesia Database. From the Civic Register, data on mortality in the study period are retrieved.