Monitoring: Equipment and Computers
Background and Goals: Tissue Doppler Echocardiography (TDE) is a novel echo technique that may quantify regional LV function. Previous reports have established transthoracic tissue Doppler imaging (TDI) for noninvasive assessment of ventricular function, but the technique has not been validated for assessment of LV function during cardiac surgery especially in patients undergoing coronary revascularization procedure. The purpose of this study is to assess the clinical feasibility of TDI in the intraoperative transesophageal echocardiography (TEE) during coronary revascularization.
Material and Methods: A total of 20 patients undergoing coronary artery bypass were studied using intraoperative TEE combined with TDI. All the data of TDI including systolic velocities, isovolumic contraction time (IVCT), isovolumic relaxation time (IVRT), early diastolic (Ea), atrial contraction (Aa) were measured before and after coronary revascularization.
Results: The data of DTI in regional segment of left ventricle had been recorded successfully in 18 segments of all patients. Compared with pre and post revascularization, the systolic velocities, mean Ea and Aa wave were significantly higher and the IVRT was significantly shortening after coronary revascularization. There was no significant difference in the IVCT before and after revascularization.
Conclusions: Pulse wave DTI is a feasible non-invasive technique that allows for the assessment of regional functional performance and dynamics of the left ventricle myocardium in the intraoperative TEE examination during coronary revascularization.