A Retrospective Study of Hemodynamic Changes in Patients After Off-Pump Coronary Artery Bypass Graft Surgery Using Impedance Cardiography

Abstract

Background This study aimed to investigate the role of impedance cardiography (ICG) to evaluate hemodynamic changes in patients after off-pump coronary artery bypass graft (OPCABG) surgery. Material/Methods One-hundred and sixty patients who had undergone OPCAGB were enrolled and assessed using New York Heart Association NYHA functional class (II, II, and IV). ICG was used to measure the stroke volume (SV), stroke volume index (SI), cardiac output per minute (CO/min), cardiac index (CI), end-diastolic volume (EDV), pre-ejection period (PEP), left ventricular ejection time (LVET), systolic time ratio (STR), left ventricular ejection fraction (LVEF), acceleration index (ACI), systemic vascular resistance (SVR), and thoracic fluid content (TFC). The ICG parameters were correlated with brain natriuretic peptide (BNP) and echocardiography parameters using multivariate regression analysis. Results The levels of CO, ACI, TFC, SVR, and BNP compared with ICG showed differences between NYHA functional class, with CO showing a significant difference (p<0.05). There were no significant differences between SV, SI, EDV, and LVEF before and after OPCAGB. Using ICG, the parameters of CI, LVEF, EDV, and TFC showed no significant correlation with BNP. SV, SI, CO, ACI, and LVET, which were negatively correlated with BNP. SVR, PEP, and STR were positively correlated with BNP (P<0.05). Conclusions In patients who had OPCABG, the findings from ICG were significantly correlated with BNP levels and the results from echocardiography for the evaluation of cardiac hemodynamic changes. ICG might have a role in the assessment of cardiac function in clinical practice.

Improvement of hemodynamic parameters in aortic stenosis patients with transcatheter valve replacement by using impedance cardiography

“…ICG uses the thoracic electrical impedance to assess hemodynamics and possesses good prospects in clinical application. A study showed that after coronary artery bypass graft, the EF, SV, CO, and CI monitored by ICG were correlated with the results obtained by echocardiography ( 26 ). TFC is an indicator of ICG that reflects the amount of fluid in the chest cavity, which could reflect the cardiac preload by recording the changes in fluid impedance.…”

The non-invasive evaluation of heart function in patients with an acute myocardial infarction: The role of impedance cardiography

“…In this single-center study changes were analyzed in the hemodynamic profile of AMI patients by using ICG. Although a good correlation between impedance diagnostics and invasive assessment of cardiac output and systemic vascular resistance has been reported [10,11], thus far, data is mostly limited to heart failure [12][13][14][15][16][17][18][19] and with only a few AMI subsets examined [20][21][22].…”

“…In patients after off-pump coronary artery bypass grafting, the findings obtained from ICG were correlated with B-type natriuretic peptide (BNP) levels and TTE measurements for the evaluation of cardiac hemodynamic changes during perioperative period [10].…”

Pomeranian atRial flOw reguLatOr iN conGestive hEart failuRe (PROLONGER): Study protocol

“…The ICG is a non-invasive diagnostic tool enabling reliable assessment of patients' hemodynamic profile [9][10][11][12][13].…”