20MHz 80チャンネルパルスドプラ法を用いた冠動脈バイパス術中における冠動脈狭窄部血流動態の解析

概要

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Coronary blood velocity waveforms and velocity spectra were evaluated in 11 patients with 75-99% stenosis of the left anterior descending coronary artery (LAD) during coronary artery bypass surgery. Coronary velocities were measured by a 20MHz 80 channel pulsed Doppler velocimeter with a plate type probe. Before indication of extracorporeal circulation, LAD blood velocities were observed at several locations distal to the stenosis. After grafting, velocities in the LAD distal to the graft insertion were measured before and during transient graft occlusion. The waveforms of the poststenotic blood velocity were characterized by systolic peaked flow, and relatively small and fluctuated diastolic flow. The velocity profiles showed irregularity at near the wall immediately distal to the stenosis. A transient graft occlusion caused large reduction in the diastolic peak velocity in the distal native LAD (p<0.01) and an increase in the ratio of the systolic to diastolic velocity (p<0.05). ( J. Jpn. Soc. Biorheol., 2(1), 31~40, 1988).
特定非営利活動法人日本バイオレオロジー学会の論文