Abstracts and Programme: EUROANAESTHESIA 2011: The European Anaesthesiology Congress: Monitoring: Equipment and Computers
Comparison of monitoring performance of bioreactance versus esophageal doppler in paediatric patients
Background and Goal of Study: Bioreactance is a technology based on the analysis of frequency variations of a transthoracic oscillating current1. Bioreactance can be used to monitor cardiac output non-invasively. This study was designed to compare the value of bioreactance technology (Nicom®) with esophageal doppler (CardioQ®) monitoring to measure cardiac index (CI) in paediatric patients.
Materials and Methods: After obtaining parents consent, 11 paediatric patients undergoing major abdominal surgery under general anaesthesia were included. Continuous hemodynamic variables obtained from both Nicom® and CardioQ® were recorded and compared. Data were analysed by the Bland-Altman method.
Results and Discussion: A total of 70 pairs of CI measures from 11 patients were analysed. Mean age was 68 months (95% CI: 42-83) and mean weight was 18 kg (15-22). The Pearson correlation coefficient for Nicom® vs. CardioQ® was 0.67 (0.52-0.78). Bland-Altman analysis revealed a bias of 0.67, precision of 1.33, limits of agreement of -0.66 - 2.0 L/min/m2 and a percentage error of 38 %. As recently suggested a percentage error of ± 45% represents a more realistic expectation of achievable precision in clinical practice2.
Conclusion: These preliminary results suggest acceptable monitoring capabilities of Nicom® compared to CardioQ®.
1. Keren H, Burkhoff D, Squara P. Am J Physiol Heart Circ Physiol 2007;293:583-589
© 2011 European Society of Anaesthesiology
2. Peyton PJ, Chong SW. Anesthesiology 2010;113:1220-35