Peroperative hemodynamic study of left internal mammary artery grafts.
(1995) The Thoracic and Cardiovascular Surgeon — Vol. 43, n° 1, p. 27-34 (1995)
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- The present study was undertaken to analyse hemodynamic features of an arterial graft and to determine parameters which influence primarily flow and velocity. A total of 284 consecutive patients having isolated coronary bypass surgery underwent peroperative hemodynamic assessment by pulsed Doppler ultrasonics of a left internal mammary artery bypass graft implanted onto the left anterior descending artery. Internal mammary artery free flow was 109.2 +/- 3.7 ml/min and flow in the internal mammary artery measured after completion of the distal anastomosis was 70.9 +/- 2.7 ml/min. All values quoted are mean +/- standard error of the mean. Mean velocity was 21.2 +/- 0.6 cm/sec, internal diameter was 2.65 +/- 0.04 mm and pulsatility index was 2.24 +/- 0.12. Resistance was expressed as mmHg/(ml . min-1) and averaged 1.65 +/- 0.13 for total resistance, 0.87 +/- 0.05 for graft resistance, and 0.73 +/- 0.13 for coronary resistance. From a set of 35 variables, stepwise multiple regression analysis selected two parameters influencing independently flow in internal mammary artery (R2 = 0.8762): flow velocity (p < 10(-4)) and internal diameter (p < 10(-4)). Variables influencing velocity (R2 = 0.3071) were: pulsatility index, which is a dimensionless expression of peripheral resistance (p < 10(-4)), and free internal mammary artery flow (p = 0.0007). Furthermore, a significant correlation between internal diameter and total resistance was observed (R = -0.5363, p < 10(-4), Y = 1.676X-1.545), and the exponentially fitted regression line was characterized by a marked increase of resistance at diameters less than 2 mm.(ABSTRACT TRUNCATED AT 250 WORDS)
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Louagie, Y., Haxhe, J.-J., Jamart, J., Gurné, O., Buche, M., & Schoevaerdts, J.-C. (1995). Peroperative hemodynamic study of left internal mammary artery grafts. The Thoracic and Cardiovascular Surgeon, 43(1), 27-34. https://hdl.handle.net/2078.5/133893 (Original work published 1995)