Peroperative hemodynamic study of left internal mammary artery grafts

The Thoracic and Cardiovascular Surgeon
Y LouagieJ C Schoevaerdts

Abstract

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 di...Continue Reading

Citations

Dec 10, 1999·The Annals of Thoracic Surgery·A G RoyseG Yu
Mar 6, 1998·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·J E EhrsamJ B Seward
Nov 14, 1998·European Journal of Cardio-thoracic Surgery : Official Journal of the European Association for Cardio-thoracic Surgery·B H WalpothT Carrel
Aug 4, 1999·European Journal of Cardio-thoracic Surgery : Official Journal of the European Association for Cardio-thoracic Surgery·B H WalpothT P Carrel

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