Intravascular Ultrasound-Derived Measures of Coronary Atherosclerotic Plaque Burden and Clinical Outcome

Stephen J. Nicholls, Amy Hsu, Kathy Wolski, Bo Hu, Ozgur Bayturan, Andrea Lavoie, Kiyoko Uno, E. Murat Tuzcu, Steven E. Nissen

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Abstract

Objectives: The aim of this study was to investigate the relationship between intravascular ultrasound (IVUS)-derived measures of atherosclerosis and cardiovascular outcomes. Background: IVUS has been used in clinical trials to evaluate the effect of medical therapies on coronary atheroma progression. Methods: Coronary plaque progression was evaluated in 4,137 patients in 6 clinical trials that used serial IVUS. The relationship between baseline and change in percent atheroma volume (PAV) and total atheroma volume with incident major adverse cardiovascular events (MACE) was investigated. Results: PAV increased by 0.3% (p < 0.001), and 19.9% of subjects experienced MACE (0.9% death, 1.8% myocardial infarction, 18.9% coronary revascularization). Greater baseline PAVs were observed in patients who experienced myocardial infarctions (42.2 ± 9.6% vs. 38.6 ± 9.1%, p = 0.001), coronary revascularization (41.2 ± 9.3% vs. 38.1 ± 9.0%, p < 0.001), or MACE (41.3 ± 9.2% vs. 38.0 ± 9.0%, p < 0.001). Each standard deviation increase in PAV was associated with a 1.32-fold (95% confidence interval: 1.22 to 1.42; p < 0.001) greater likelihood of experiencing a MACE. During follow-up (21.1 ± 3.7 months), greater increases in PAV, but not total atheroma volume, were observed in subjects who experienced MACE compared with those who did not (0.95 ± 0.19% vs. 0.46 ± 0.16%, p < 0.001). Each standard deviation increase in PAV was associated with a 1.20-fold (95% confidence interval: 1.10 to 1.31; p < 0.001) greater risk for MACE. Multivariate analysis revealed that factors associated with MACE included baseline PAV (p < 0.0001), change in PAV (p = 0.002), smoking (p = 0.0002) and hypertension (p = 0.01). Conclusions: A direct relationship was observed between the burden of coronary atherosclerosis, its progression, and adverse cardiovascular events. The relationship between disease progression and outcomes largely reflected the need for coronary revascularization. These data support the use of atherosclerosis imaging with IVUS in the evaluation of novel antiatherosclerotic therapies.

Original languageEnglish
Pages (from-to)2399-2407
Number of pages9
JournalJournal of the American College of Cardiology
Volume55
Issue number21
DOIs
Publication statusPublished - 25 May 2010
Externally publishedYes

Keywords

  • atherosclerosis
  • imaging
  • intravascular ultrasound
  • risk factors

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