Abstract
Objectives
Cardiac surgery using cardiopulmonary bypass (CPB) induces a systemic inflammatory response that affects common inflammatory markers, including C-reactive protein (CRP), white blood cell count (WBC), and body temperature, complicating postoperative diagnosis of infections. The objective of this study was to assess the incidence of postoperative infections and evaluate the performance of clinically used biomarkers.Design
This was a bidirectional cohort study including patients undergoing cardiac surgery with CPB between 1st of February 2020 and 22nd of September 2021. Patients with postoperative infection were compared to patients without. Multivariable logistic regression was used to identify independent predictors of postoperative infections. Receiver operating characteristic (ROC) curves evaluated the diagnostic ability of current biomarkers to detect infection.Results
A total of 1,222 patients were included. The incidence of postoperative infections (during hospitalisation and/or late infection) was 17.3%. Patients with postoperative infection had more comorbidities, underwent more complex procedures, and had higher mortality (90-day mortality 3.8% vs 1.5%, p = 0.045; 1-year mortality 5.7% vs 2.7%, p = 0.032). CRP, WBC, and temperature performed poorly in detecting postoperative infection, although peak CRP (OR 1.069, p p = 0.005) were independent predictors of postoperative infection. Peak temperature occurred on postoperative day 5 in infected patients versus day 2 in those without infection.Conclusion
Postoperative infections following cardiac surgery with CPB remain common and are associated with increased postoperative complications and mortality. Common inflammatory biomarkers perform poorly in detecting infection. Improved diagnostic tools are needed to facilitate early detection and treatment.