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J Thorac Cardiovasc Surg 2003;126:1080-1086
© 2003 The American Association for Thoracic Surgery

Cardiopulmonary support and physiology

Noninvasive evaluation of internal thoracic artery and left anterior descending coronary artery anastomotic sites using transthoracic Doppler echocardiography: comparison with coronary arteriography

^a Division of Cardiovascular Surgery, Takarazuka Municipal Hospital, Takarazuka, Hyogo, Japan

Received for publication February 19, 2002; revisions received July 8, 2002; revisions received November 8, 2002; accepted for publication December 4, 2002.

^* Address for reprints: Nobuaki Hirata, MD, Division of Cardiovascular Surgery, Takarazuka Municipal Hospital, 4-5-1, Kohama, Takarazuka, Hyogo 665-0827, Japan
hirata{at}xd5.so-net.ne.jp

OBJECTIVES: This study was designed to evaluate anastomotic sites located between the internal thoracic artery and left anterior descending coronary artery using transthoracic Doppler echocardiography, and then to clarify the accuracy of those results by comparison with coronary arteriographic findings.

METHODS: We examined 35 consecutive patients who had undergone bypass surgery. The echocardiographic examinations were performed within approximately 1 week of follow-up coronary arteriography, which occurred at 4.3 ± 2.2 months after bypass surgery. We measured the diameter using intraluminal flow signals, and we also measured flow velocity.

RESULTS: Adequate spectral Doppler recordings of coronary flow in the anastomosis were obtained in 31 (89%) of the 35 study patients. In the normal anastomosis group (n = 25), the diameter and the peak blood flow velocity of the internal thoracic artery and left anterior descending coronary artery were 1.5 ± 0.3 mm and 2.0 ± 0.4 mm, and 58 ± 25 cm/s and 47 ± 20 cm/s, respectively. Stringed internal thoracic artery was found in 4 patients; the echocardiographic findings revealed a greater amount of information regarding the physiologic state in the area of anastomosis compared with angiographic findings. In a stenotic anastomosis found in 2 patients, the blood flow velocity findings at the anastomotic sites (83 ± 228 cm/s) were higher than those in normal anastomotic patients (59 ± 28 cm/s).

CONCLUSIONS: Transthoracic Doppler echocardiography enabled an effective evaluation of anastomotic sites between the internal thoracic artery and left anterior descending coronary artery in over 80% of our patients. This totally noninvasive method is thought to be reliable and able to provide a greater amount of information, compared with coronary arteriography, regarding the physiologic state of an anastomosis, such as a competitive relationship.

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