Outcomes of Operative and Nonoperative Treatment of Thoracic Empyema: A Population-Based Study

Abstract

The optimal management of thoracic empyema remains unclear. This study compared mortality and readmission risk after operative vs nonoperative treatment of thoracic empyema. Administrative universal health care data were used to conduct a retrospective population-based cohort study of thoracic empyema in Ontario, Canada. Individuals aged 18 years or older with a hospital discharge diagnosis ofthoracic empyema from January 1, 1996, to December 31,2015, were included. Treatment approach was classifiedas nonoperative (ie, chest tube with or without fibrinolytics) or operative (video-assisted thoracoscopic surgery [VATS] or open decortication). Modified Poisson regression wasused to estimate adjusted risk ratios (RRadj) between treatment (open decortication was the reference group) and(1) death and (2) readmission. Analyses were also stratified by year of admission in 5-year intervals. The study cohort comprised 9014 hospitalized individuals. Individuals treated nonoperatively had higher mortality risk as an inpatient (17.2% vs 10.6%; RRadj, 1.32-1.54), at 30 days (11.1% vs 4.2%; RRadj, 1.86-3.38), 6 months (26.6% vs 15.0%; RRadj, 1.38-1.59), and 1 year (32.3% vs 18.8%; RRadj, 1.38-1.59). No differences in 90-day readmission risk were observed. No effect measure modification wasobserved in models stratified by year of admission. Nonoperative management of thoracic empyema was associated with higher risk of mortality compared with surgical decortication. Early thoracic surgical consultation is recommended.