Background The Society of Thoracic Surgeons (STS) uses statistical models to create risk-
adjusted performance metrics for Adult Cardiac Surgery Database (ACSD) participants.
Because of temporal changes in patient characteristics and outcomes, evolution of surgical
practice, and additional risk factors available in recent ACSD versions, completely new risk
models have been developed. Methods Using July 2011 to June 2014 ACSD data, risk
models were developed for operative mortality, stroke, renal failure, prolonged ventilation …

Background The last published version of The Society of Thoracic Surgeons (STS) Adult
Cardiac Surgery Database (ACSD) risk models were developed in 2008 based on patient
data from 2002 to 2006 and have been periodically recalibrated. In response to evolving
changes in patient characteristics, risk profiles, surgical practice, and outcomes, the STS has
now developed a set of entirely new risk models for adult cardiac surgery. Methods New
models were estimated for isolated coronary artery bypass grafting surgery (CABG [n …