Validation of stroke volume variation assessed by electrical cardiometry to predict fluid responsiveness in patients undergoing coronary artery bypass surgery after closure of the sternum: an observational study

Abstract

Background Cardiac output is an important determinant of tissue perfusion, with several methods described to assess it. Electrical cardiometry is a new noninvasive method for determination of stroke volume variation (SVV), which is used to calculate the cardiac output. Aim of work This study aimed to validate the electrical cardiometry measurements of SVV compared with measurements of SVV taken by transesophageal echocardiography (TEE). Methods A total of 38 patients were included in this study. Hemodynamic parameters were obtained by TEE and cardiometry soon after closure of the sternum and after volume expansion. Results SVV after 10 min of sternum closure by TEE was 15.5% (SD=7.1), and SVV after 10 min of sternum closure by cardiometry was 14.3% (SD=6.1). Bland–Altman analysis revealed a mean bias of −1.2. The 1.96 SD limits of agreement were −8 to 5.7%. Conclusion There is a good correlation between SVV measured by TEE and that measured by cardiometry. Cardiometry can be used as a noninvasive hemodynamic monitoring in patients undergoing coronary artery bypass surgery surgery.