Correlation of Electric Cardiometry and Continuous Thermodilution Cardiac Output Monitoring Systems

Vishwas Malik, Arun Subramanian, Sandeep Chauhan, Milind Hote

Department of Cardiac Anesthesiology, All India Institute of Medical Sciences, New Delhi, India.
Department of Cardiothoracic and Vascular Surgery, All India Institute of Medical Sciences, New Delhi, India.

DOI: 10.4236/wjcs.2014.47016                

Abstract

Purpose: Impedance Cardiography (ICG) with its drawbacks to reliably estimate cardiac output (CO) when compared to reference methods has led to the development of a novel technique called Electrical Cardiometry (EC). The purpose of this study was to compare EC-CO with the Continuous CO (CCO) derived from Pulmonary Artery Catheter (PAC). Methods: 60 patients scheduled to undergo coronary artery surgery necessitating the placement of PAC were studied in the operating room. Standard ECG electrodes were used for EC-CO measurements. Simultaneous CO measurement from EC and PAC was done at three predefined time points and were correlated. Results: A significant high correlation was found between the EC-CO and CCO at the three time points. Bland and Altman analysis revealed a bias of 0.08 L/min, a precision of 0.15 L/min, with a narrow limit of agreement (－0.13 to 0.28 L/min). The percentage error between the methods was 3.59%. Conclusion: The agreement between EC-CO and CCO is clinically acceptable and these two techniques can be used interchangeably. Mediastinal opening has no effect on the correlation between these two modalities.

Keywords

Pulmonary Artery Catheter, Electrical Cardiometry, Cardiac Output, Thermodilution

Conflicts of Interest

The authors declare no conflicts of interest.

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