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Intima-media thickness and carotid resistive index: progression over 6 years and predictive value for cardiovascular

H Uthoff1, D Staub, A Meyerhans

  • 1Department of Internal Medicine, Division of Angiology, Cantonal Hospital Frauenfeld, Frauenfeld, Switzerland.

Ultraschall in Der Medizin (Stuttgart, Germany : 1980)
|June 6, 2008
PubMed

Insights

Intima-media thickness (IMT) and resistive index (RI) predict cardiovascular events. IMT progression, unlike RI, indicates worsening atherosclerosis, especially after an event, making it valuable for risk assessment.

Area of Science:

  • Cardiovascular Medicine
  • Medical Imaging
  • Biomarkers

Background:

  • Intima-media thickness (IMT) and resistive index (RI) are established cardiovascular risk predictors.
  • Long-term predictive values and progression patterns of IMT and RI require further investigation.

Purpose of the Study:

  • To evaluate the long-term predictive value of IMT of the common carotid artery and RI of the internal carotid artery for cardiovascular events.
  • To assess the progression of IMT and RI over time and their relationship with cardiovascular risk and events.

Main Methods:

  • 145 patients with cardiovascular risk factors or atherosclerosis underwent duplex sonography for IMT and RI measurements at baseline, 36, and 74 months.
  • Cardiovascular events (death, myocardial infarction, stroke) were recorded during follow-up.
  • Statistical analyses, including log-rank analysis, were used to assess the relationship between IMT, RI, their progression, and cardiovascular events.

Main Results:

  • Both baseline IMT and RI were continuous predictors of cardiovascular events (p=0.011 and p=0.006, respectively).
  • IMT progression was significantly higher in patients with high atherosclerotic burden (SMART score >7) and those who experienced a cardiovascular event (p<0.002 and p<0.001, respectively).
  • No significant progression of RI was detected in any patient group during the follow-up period.

Conclusions:

  • IMT and RI confirm their long-term predictive value for cardiovascular events.
  • IMT demonstrates progression over six years, particularly in patients experiencing cardiovascular events, supporting its use for risk stratification and monitoring.
  • RI progression could not be reliably measured, limiting its utility for monitoring atherosclerosis progression; further research is needed on drug therapy effects on RI.
Abstract

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