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Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans
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Published on: August 28, 2018

Distribution of coronary atherosclerosis in patients with coronary artery disease

Kohichiro Iwasaki1, Takeshi Matsumoto, Hitoshi Aono

  • 1Department of Cardiology, Okayama Central Hospital, 6-3 Ishimakitamachi, Okayama 700-0017, Japan. iwasaki_k@kohjin.ne.jp

Heart and Vessels
|January 22, 2010
PubMed

Insights

Coronary artery calcium (CAC) predominantly accumulates in the left anterior descending artery in patients with mild to high scores. However, this pattern shifts in individuals with very high CAC, showing a more even distribution across major coronary arteries.

Area of Science:

  • Cardiology
  • Radiology
  • Atherosclerosis Research

Background:

  • The precise distribution of coronary atherosclerosis remains incompletely understood.
  • Coronary artery calcium scoring (CACS) is a key imaging biomarker for assessing atherosclerosis burden.

Purpose of the Study:

  • To investigate the distribution patterns of coronary artery calcium (CAC) across different coronary arteries based on CACS severity.
  • To determine if the prevalence and severity of CAC differ among the right coronary artery (RCA), left main trunk (LMT), left anterior descending coronary artery (LAD), and left circumflex coronary artery (LCx) in relation to overall CACS.

Main Methods:

  • Coronary artery calcium score (CACS) was measured using the Agatston method in 624 patients.
  • CACS was quantified for individual arteries: RCA, LMT, LAD, and LCx, and a total CACS was calculated.
  • Patients were stratified into four groups based on total CACS: 1-100 (Group A), 101-400 (Group B), 401-1000 (Group C), and >1000 (Group D).

Main Results:

  • In patients with mild to high CACS (Groups A, B, and C), the LAD demonstrated significantly higher CACS and more frequent CAC prevalence compared to RCA, LMT, and LCx (P < 0.0001).
  • In the very high CACS group (Group D), the CACS was not significantly different between LAD and RCA (P = 0.6930), and CAC prevalence was similar across LAD, RCA, and LCx (P = 0.4435).
  • The typical distribution pattern favoring LAD is observed in mild to moderate atherosclerosis but diminishes with increasing disease severity.

Conclusions:

  • The left anterior descending artery is the most common site for coronary artery calcium in patients with mild to high atherosclerosis burden.
  • In cases of very severe coronary atherosclerosis (CACS >1000), the distribution of CAC becomes more uniform across the major coronary arteries.
  • Understanding these distribution shifts is crucial for accurate risk stratification and targeted therapeutic strategies in coronary artery disease.

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