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Ann Thorac Surg 1998;65:731-734
© 1998 The Society of Thoracic Surgeons

Original Articles: Cardiovascular

Angiographic Follow-up of Internal Thoracic Artery for Free Bypass Grafting

Tomoyuki Masuda, MD, Yasuo Matsuda, MD, Yoshinori Tanimoto, MD, Kensuke Sakata, MD, Kenji Hayashi, MD, Yurio Kobayashi, MD

Cardiovascular Center, Saiseikai Shimonoseki Hospital, Shimonoseki, Japan

Accepted for publication September 17, 1997.

Dr Masuda, Saiseikai Shimonoseki Hospital, Kifune 3-4-1, Shimonoseki, Yamaguchi 751, Japan.

Background. The use of free internal thoracic artery (ITA) grafts in patients with smaller body surface areas has been questioned because of technical difficulties and inadequate graft flow.

Methods. To evaluate postoperative changes in the diameter of free ITA grafts, we performed coronary angiography immediately after coronary artery bypass grafting and then again at a mean of 42 ± 6 months later. In 20 consecutively treated patients, 21 free ITAs were used as bypass conduits. Two ITA grafts that were patent at the time of the first angiography had closed at the second angiography. Postoperative changes in ITA graft diameter were measured in the 19 patent ITA grafts.

Results. At the first angiography, the mean diameters of the proximal, middle, and distal ITA grafts were 2.28 ± 0.45 mm, 2.34 ± 0.39 mm, and 2.12 ± 0.38 mm, respectively. At the second angiography, the mean diameters of the proximal, middle, and distal ITA grafts were 2.85 ± 0.50 mm, 2.89 ± 0.53 mm, and 2.72 ± 0.53 mm, respectively. All segments of the ITA grafts had dilated significantly between the first and second angiographic evaluations (p < 0.01). The percentage change in graft diameter was greater when the initial ITA diameter was less than 2.3 mm (32.0% ± 28.0%) than when it was 2.3 mm or more (18.8% ± 11.3%) (p < 0.05).

Conclusions. The postoperative increase in free ITA graft diameter depends on coronary blood flow requirements.




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