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Ann Thorac Surg 1998;65:1348-1352
© 1998 The Society of Thoracic Surgeons

Vertical Displacement of the Beating Heart by the Octopus Tissue Stabilizer: Influence on Coronary Flow

Paul F. Gründeman, MD, PhDa, Cornelius Borst, MD, PhDa, Joost A. van Herwaarden, MDa, Cees W.J. Verlaana, Erik W.L. Jansen, MD, PhDa

a Department of Cardiology, Heart Lung Institute, Utrecht University Hospital, Utrecht, the Netherlands

Accepted for publication December 27, 1997.

Address reprint requests to Dr Gründeman, Experimental Cardiology Laboratory, Heart Lung Institute, Utrecht University Hospital (Rm G02.523), PO Box 85500, 3508 GA Utrecht, the Netherlands
e-mail: (exp.cardio{at}hli.azu.nl)

Background. In beating heart coronary artery bypass graft operations, biventricular pump failure, as observed after exposure of the posterior circumflex branches by sternotomy, may originate from mechanical obstruction to coronary flow.

Methods. Regional coronary blood flow was measured in 8 anesthetized, paced, ß-blocked pigs, and the beating heart was fully retracted.

Results. Displacement decreased cardiac output from 4.8 ± 1.1 L/min (mean ± standard deviation) to 2.8 ± 1.2 L/min (p < 0.001), a 42% ± 6% decrease that resulted in a decrease in mean arterial pressure by 48% ± 6% (mean ± standard error of the mean; p < 0.001) and a reduction in coronary blood flow in the left anterior descending coronary artery, the right coronary artery, and the circumflex coronary artery by 34% ± 6%, 25% ± 8%, and 50% ± 10%, respectively (all p < 0.05 versus baseline). Relative circumflex coronary artery flow was 20.1% ± 8.3% lower than the combined relative value of left anterior descending coronary artery and right coronary artery flows (p = 0.046). Subsequent 20 degrees head-down tilt significantly increased ventricular preload pressures and restored cardiac output and mean arterial pressure as well as coronary blood flow.

Conclusions. It is inferred that coronary blood flow was not mechanically obstructed during anterior displacement of the porcine beating heart, because augmentation of preloads by the maneuver of Trendelenburg restored coronary flow parallel to the recovery of cardiac output and mean arterial pressure while the heart remained retracted by 90 degrees.






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