Circulation, Vol 51, 442-445, Copyright © 1975 by American Heart Association
M Bassan, W Ganz, HS Marcus and HJ Swan
The changes in coronary blood flow in response to intracoronary injection
of 3 ml of 76% Renografin were studied in 47 patients using the
thermodilution technique for continuous measurement of coronary sinus blood
flow. Within seconds after left coronary injection, an increase in coronary
sinus flow began which peaked at an average of 53% above control in 5-10
seconds. There was a corresponding decrease in coronary resistance. Flow
returned to control level in almost all patients within one minute of
injection. Twenty-four of 35 patients had no change in coronary sinus flow
in response to right coronary injection. This can be explained by the fact
that most of the venous flow from the right coronary artery returns in such
a way that it cannot be measured by the coronary sinus catheter. Of the
eleven patients who did show an increase, seven had angiographically
documented right to left collaterals, suggesting that the increase in flow
was the result of vasodilatation of the left coronary bed by contrast
arriving via the right to left collaterals. The percent changes in flow and
resistance in response to left coronary injection were isgnificantly
greater in the 13 normals than in the 34 with obstructive disease of the
left coronary artery (P lessthan 0.01). Flow rose 70 plus or minus 27%
(mean plus or minus standard deviation) in the normals versus 46 plus or
minus 25% in the patients with coronary artery disease, while resistance
fell 44 plus or minus 9% versus 33 plus or minus 11%. The differences,
however, were not sufficient for these changes to be of value in the
assessment of the degree of impairment of the coronary arterial bed in the
individual patient.
ARTICLES
The effect of intracoronary injection of contrast medium upon coronary blood flow
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