Causes of and risk factors for unplanned readmission in a large cohort of patients undergoing major surgery: a retrospective cohort study.

Introduction: Unplanned hospital readmissions after surgery are substantial drivers of expenditure and bed occupancy within the healthcare system. As a result, any targeted interventions that reduce readmission in this population can have a significant impact on patient well-being and the health budget.

Methods: We performed a large retrospective cohort study analysing data from patients from our institution who underwent major surgery between 1 May 2011 and 1 February 2022.