European Heart Journal Advance Access originally published online on March 8, 2006
European Heart Journal 2006 27(14):1664-1670; doi:10.1093/eurheartj/ehi796
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Compensatory enlargement of human coronary arteries during progression of atherosclerosis is unrelated to atheroma burden: serial intravascular ultrasound observations from the REVERSAL trial
1 Department of Cardiovascular Medicine, The Cleveland Clinic Foundation, 9500 Euclid Avenue, Desk F25, Cleveland, OH 44195, USA
2 Department of Diagnostic Radiology, The Cleveland Clinic Foundation, Cleveland, OH, USA
Received 8 October 2005; revised 17 December 2005; accepted 26 January 2006; online publish-ahead-of-print 8 March 2006.
* Corresponding author. Tel: +1 216 444 8130; fax: +1 216 445 7723. E-mail address: tuzcue{at}ccf.org
Aims On the basis of the evidence from autopsy studies, it is accepted that compensatory enlargement (remodelling) of coronary arteries during progression of atherosclerosis diminishes once atheroma burden (cross-sectional area stenosis) reaches
40%. Our aim was to evaluate whether atheroma burden is a limiting factor for coronary arterial remodelling using in vivo serial intravascular ultrasound (IVUS).
Methods and results From the cohort of the Reversal of Atherosclerosis with Aggressive Lipid Lowering (REVERSAL) trial, we identified 210 focal coronary lesions at baseline IVUS. Of these, 128 lesions that had an increase in atheroma area at the 18-month follow-up IVUS were included in the analysis. Lesions were matched at baseline and follow-up. The increase in external elastic membrane (EEM) area for each mm2 increase in atheroma area was not significantly different in lesions with <40 and
40% atheroma burden at baseline (1.62 vs. 1.28 mm2, P=0.30). There were no correlations between atheroma burden at baseline and change in EEM (r=0.02, P=0.86) or change in lumen (r=0.04, P=0.64) areas.
Conclusion Assessment of coronary arterial remodelling by serial IVUS revealed that compensatory remodelling is not limited by atheroma burden. Atheroma burden is not a determinant of arterial enlargement during the progression of atherosclerosis.
Key Words: Coronary artery disease Remodelling Intravascular ultrasound Imaging
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