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Circulation, Vol 56, 18-25, Copyright © 1977 by American Heart Association

ARTICLES

The pulsed Doppler coronary artery catheter preliminary report of a new technique for measuring rapid changes in coronary artery flow velocity in man

JS Cole and CJ Hartley

A new catheter which measures instantaneous changes in coronary artery blood flow velocity is described. The linear relationship between flow velocity is described. The linear relationship between flow velocity measured with the catheter and volume flow through small arteries is documented with a correlation coefficient of 4=0.99. Coronary flow velocity has been measured from the proximal right and left coronary arteries and aortic ostia of saphenous vein bypass grafts in patients undergoing diagnostic coronary arteriography. The increase in coronary flow following injection of contrast media in normal coronary arteries is similar to the increase in coronary flow reported following near- maximum exercise. This increased flow response following injection of contrast media is severly limited by coronary artery stenosis and may provide a useful method for assessing hemodynamically significant stenosis in patients with coronary artery disease.

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