Assessment of transmural coronary blood flow with intraoperative transesophageal color Doppler echocardiography during coronary revascularization

Intraoperative color Doppler transesophageal echocardiography with a 4- to 7-MHz transducer was performed on 28 consecutive patients who underwent cor onary artery bypass grafting to image and evaluate the transmural coronary blood now before and after cardiopulmonary bypass. The transmural coronary flow was visualized in 26 (92.8%) of 28 patients In the inferior wall and i n 13 (46.4%) of 28 patients in the lateral wall The peak diastolic now velo city of the transmural coronary artery in the inferior and lateral wall was significantly increased after coronary revascularization in patients with a successful bypass graft to the right coronary artery (from 34.0 +/- 19.7 to 64.9 +/- 30.9 cm/s, P <.001, n = 10) and to the left circumflex coronary artery (from 35.1 +/- 18.6 to 62.1 +/- 21.1 cm/s, P < .001, n = 10). No si gnificant changes were observed in patients with no bypass graft to the rig ht or left circumflex coronary artery. Coronary blood flow can be mapped an d the velocity measured with Doppler transesophageal echocardiography with a high-frequency (4- to 7-MHz) transducer. Assessment of the transmural cor onary flow may provide valuable information and aid in decision making duri ng surgical revascularization. (J Am Soc Echocardiogr 1999;12:241-51.).