Circulation, Vol 80, 1747-1756, Copyright © 1989 by American Heart Association
AH Kragel, SG Reddy, JT Wittes and WC Roberts
We studied at necropsy atherosclerotic plaque composition in the four major
(right, left main, left anterior descending, and left circumflex)
epicardial coronary arteries in 15 patients who died of consequences of an
acute myocardial infarction (AMI) and in 12 patients with sudden coronary
death (SCD) without AMI. The coronary epicardial arteries were sectioned at
5-mm intervals, and a Movat-stained section of each segment of artery was
prepared and analyzed using a computerized morphometry system. Within the
AMI group and within the SCD group, there were no differences in plaque
composition among any of the four major epicardial coronary arteries.
Within both groups, plaque morphology varied as a function of
cross-sectional-area narrowing of the segments. In both groups, the amount
of dense relatively acellular fibrous tissue, calcified tissue, and
pultaceous debris (amorphous debris containing cholesterol clefts,
presumably rich in extracellular lipid) increased in a linear fashion with
increasing degrees of cross- sectional-area narrowing of the segments, and
the amount of cellular fibrous tissue decreased linearly. In the AMI group,
the percentage of plaque consisting of pultaceous debris and of cellular
fibrous tissue separated significantly narrowed (greater than 75%
cross-sectional area) segments from less narrowed (less than 75%) segments.
A comparison of the AMI group to the SCD group showed significant
differences. The percentage of plaque consisting of pultaceous debris (16%
in the AMI group and 7% in the SCD group), of cellular fibrous tissue (11%
vs. 18%), and of heavily calcified tissue (8% vs. 16%) were significantly
different in the severely narrowed segments in the AMI and SCD groups. When
all arteries containing thrombi were deleted from the analysis, there were
no significant changes in the results. Occlusive coronary thrombi were
present in 13 of the 15 AMI patients and in one of the 12 SCD patients.
Thus, the frequency of coronary thrombi and plaque composition differ in
patients with AMI and in those with SCD without AMI.
ARTICLES
Morphometric analysis of the composition of atherosclerotic plaques in the four major epicardial coronary arteries in acute myocardial infarction and in sudden coronary death
Pathology Branch, National Institute of Health, Bethesda, MD 20892.
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