High- vs. Low-Intensity Statin Therapy and Changes in Coronary Artery Calcification Density after One Year

Area of Science:

• Cardiology
• Radiology
• Pharmacology

Background:

• Statin therapy is known to influence the progression of coronary artery calcification (CAC).
• Previous randomized controlled trials (RCTs) with one-year follow-up showed no significant difference in Agatston score or CAC volume between high-intensity statin therapy (HIST) and low-to-intermediate intensity statin therapy (LIST).
• The impact of statin intensity on CAC density remains an area of investigation.

Purpose of the Study:

• To evaluate whether statin intensity modifies coronary artery calcification (CAC) density after one year of treatment.
• To compare the effects of high-intensity statin therapy (HIST) versus low-to-intermediate intensity statin therapy (LIST) on CAC density changes.

Main Methods:

• A pooled analysis of two randomized controlled trials (BELLES and EBEAT) involving 852 patients was conducted.
• Patients received either high-intensity statin therapy (HIST: Atorvastatin 80 mg) or low-to-intermediate intensity statin therapy (LIST: Pravastatin 40 mg, Atorvastatin 10 mg).
• Coronary artery calcification (CAC) density and its change from baseline were assessed at one-year follow-up using CT scans and compared via two-sided t-tests.

Main Results:

• High-intensity statin therapy (HIST) resulted in a greater reduction in LDL-cholesterol compared to low-to-intermediate intensity statin therapy (LIST).
• Mean CAC density increased from baseline to one-year follow-up in the overall study population.
• No significant difference was observed in CAC density at follow-up or in the change of CAC density from baseline between the HIST and LIST groups (p = 0.59 and p = 0.73, respectively).
• Subgroup analyses based on LDL reduction, baseline Agatston score, and number of lesions did not reveal significant differences in CAC density changes between the treatment groups.

Conclusions:

• While high-intensity statin therapy (HIST) more effectively reduces cholesterol levels than low-to-intermediate intensity statin therapy (LIST), this difference does not translate into a significant change in coronary artery calcification (CAC) density at one year.
• Statin intensity does not appear to modify CAC density progression within the first year of treatment, despite differences in lipid-lowering efficacy.