Continuous Monitoring of Inflammation Biomarkers During Simulated Cardiopulmonary Bypass Using a Microfluidic Immunoassay Device—A Pilot Study


  • Presented in part at the 8th International Conference on Pediatric Mechanical Circulatory Support Systems and Pediatric Cardiopulmonary Perfusion held June 13–16, 2012 in Istanbul, Turkey.

Address correspondence and reprint requests to Dr. Lawrence Sasso, Department of Biomedical Engineering, Rutgers, The State University of New Jersey, 599 Taylor Rd, Piscataway, NJ 08854, USA. E-mail:


This work demonstrates the use of a continuous online monitoring system for tracking systemic inflammation biomarkers during cardiopulmonary bypass (CPB) procedures. The ability to monitor inflammation biomarkers during CPB will allow surgical teams to actively treat inflammation and reduce harmful effects on postoperative morbidity and mortality, enabling improved patient outcomes. A microfluidic device has been designed which allows automation of the individual processing steps of a microbead immunoassay to allow continuous tracking of antigen concentrations. Preliminary experiments have demonstrated that the results produced by the microimmunoassay are comparable to results produced from a standard enzyme-linked immunosorbent assay (r = 0.98). Additionally, integration of the assay with a simulated CPB circuit has been demonstrated with temporal tracking of C3a concentrations within blood continuously sampled from the circuit. The presented work describes the motivation, design challenges, and preliminary experimental results of this project.