Trans-esophageal echocardiography in off-pump coronary artery bypass grafting

Area of Science:

• Cardiovascular Surgery
• Cardiac Anesthesia
• Echocardiography

Background:

• Off-pump coronary artery bypass (OPCAB) surgery carries risks of hemodynamic instability.
• Instability can arise from coronary artery occlusion during anastomosis or cardiac displacement.
• Accurate assessment of cardiac function and filling is crucial during OPCAB.

Purpose of the Study:

• To evaluate the utility of transesophageal echocardiography (TEE) in managing hemodynamic instability during OPCAB.
• To differentiate between myocardial ischemia and external cardiac compression as causes of hemodynamic changes.
• To assess the impact of cardiac manipulation on ventricular filling and function.

Main Methods:

• Utilized transesophageal echocardiography (TEE) for real-time cardiac monitoring during OPCAB procedures.
• Observed ventricular filling, contractility, and valvular function (mitral/tricuspid regurgitation) via TEE.
• Correlated TEE findings with hemodynamic parameters and surgical manipulations.

Main Results:

• TEE effectively identified ventricular compression due to cardiac displacement, especially when accessing posterior vessels.
• TEE distinguished between ischemia-induced wall motion abnormalities and increased filling pressures from external compression.
• TEE detected worsening cardiac function, including reduced contractility and increased mitral regurgitation, during coronary occlusion.

Conclusions:

• TEE is a valuable tool for detecting and managing hemodynamic instability during OPCAB surgery.
• TEE facilitates differentiation between primary cardiac dysfunction and secondary hemodynamic changes.
• Real-time TEE guidance allows for timely intervention, such as heart repositioning, to optimize cardiac performance.