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Ann Thorac Surg 1999;68:838-843
© 1999 The Society of Thoracic Surgeons

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Original Articles: Cardiovascular

Computer-assisted endoscopic coronary artery bypass anastomoses: a chronic animal study

^a Section of Cardiothoracic and Vascular Surgery, Department of Surgery, The Milton S. Hershey Medical Center, Penn State Geisinger Health System, Hershey, Pennsylvania, USA and
^b Computer Motion, Inc, Goleta, California, USA

Address reprint requests to Dr Damiano, Section of Cardiothoracic and Vascular Surgery, The Milton S. Hershey Medical Center, Penn State Geisinger Health System, PO Box 850, Hershey, PA 17033
e-mail: rdamiano{at}psghs.edu

Presented at the Poster Session of the Thirty-fifth Annual Meeting of The Society of Thoracic Surgeons, San Antonio, TX, Jan 25–27, 1999.

Background. With traditional instruments, endoscopic coronary artery bypass grafting (ECABG) has not been possible. This study was designed to determine the feasibility of using a robotically-assisted microsurgical system to perform ECABG in a chronic animal model.

Methods. Nine calves were placed on cardiopulmonary bypass after harvesting the left internal mammary artery (LIMA). Subxiphoid endoscopic ports (2 instrument, 1 camera) were placed, and a robotic system was used to perform ECABG between the LIMA and left anterior descending coronary artery. LIMA graft flow (LIMA_Q) was measured. Animals were sacrificed at 1 month, and hearts underwent angiographic and histologic analyses.

Results. Acute graft patency was 89% (8/9). Two animals died suddenly within the first 48 hours. There was no significant difference in mean acute and chronic (n = 6) LIMA_Q (40.9 ± 4.7 and 38.5 ± 5.0 ml/min, respectively). Survivors had an angiographic patency rate of 100% (6/6), confirmed by histology.

Conclusions. This study shows that ECABG is feasible in a chronic animal model with excellent results.

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