(Circulation. 1995;92:2157-2162.)
© 1995 American Heart Association, Inc.
Articles |
Coronary Artery Calcium Area by Electron-Beam Computed Tomography and Coronary Atherosclerotic Plaque Area
A Histopathologic Correlative Study
Presented in part at the 67th Annual Scientific Sessions of the American Heart Association, Dallas, Tex, November 14-17, 1994.
From the Departments of Cardiovascular Diseases and Internal Medicine (J.A.R., D.B.S., R.S.S.), Diagnostic Radiology (P.F.S.), and Endocrinology and Internal Medicine (L.A.F.), Mayo Clinic and Foundation, Rochester, Minn.
Correspondence to John A. Rumberger, PhD, MD, Department of Cardiovascular Diseases, Mayo Clinic, 200 First St SW, Rochester, MN 55905.
Background Coronary calcium identified by electron-beam computed tomography (EBCT) correlates poorly with luminal atherosclerotic narrowing, but calcium, an intimate part of coronary plaque, may be more directly related to atheromatous plaque area.
Methods and Results Thirty-eight coronary arteries from 13 autopsy hearts were dissected, straightened, and scanned with EBCT in 3-mm contiguous increments. Coronary calcium area was defined as one or more pixels with a density >130 Hounsfield units (0.18 mm2/pixel). Each artery was divided into corresponding 3-mm segments, representative histological sections were stained, and atherosclerotic plaque area per segment (mm2) was quantified. Coronary artery calcium and coronary artery plaque areas were correlated for the hearts as a whole, for individual coronary arteries, and for individual coronary artery segments. The sums of histological plaque areas versus the sums of calcium areas were highly correlated for each heart and for each coronary artery. However, coronary plaque area was on the order of five times greater than calcium area. Furthermore, minimal diffuse segmental coronary plaque could be present despite the absence of coronary calcium detectable by EBCT.
Conclusions This histopathologic study confirms an intimate relation between whole heart, coronary artery, and segmental coronary atherosclerotic plaque area and EBCT coronary calcium area but suggests that there is a threshold value for plaque area below which coronary calcium is either absent or not detectable by this methodology.
Key Words: calcium • arteries • tomography • atherosclerosis • diagnosis
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