Use of tissue Doppler imaging following coronary artery bypass surgery

Area of Science:

• Cardiology
• Cardiac Surgery
• Echocardiography

Background:

• Coronary artery bypass grafting (CABG) is a common surgical procedure for ischemic heart disease.
• Assessing the impact of CABG on myocardial function is crucial for understanding surgical outcomes.
• Tissue Doppler imaging (TDI) offers a method to evaluate myocardial contractility.

Purpose of the Study:

• To evaluate the effect of CABG on myocardial systolic function.
• To assess changes in myocardial velocities using TDI in the early post-operative period.

Main Methods:

• A prospective study involving 14 patients (mean age 61 years) who underwent isolated CABG.
• Tissue Doppler imaging (TDI) was used to measure systolic velocities at four left ventricular sites.
• Measurements were taken pre-operatively, and at 1 and 6 weeks post-operatively.

Main Results:

• Significant increases in myocardial wall velocities were observed at all measured left ventricular sites one week after CABG.
• These elevated velocities persisted at the 6-week follow-up, although at lower levels than week 1.
• The findings indicate a positive response of the ischemic myocardium to surgical revascularization.

Conclusions:

• CABG leads to early improvements in myocardial segmental systolic velocities.
• TDI is a valuable tool for assessing functional recovery after CABG.
• Surgical revascularization effectively enhances systolic function in the ischemic myocardium.