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Circulation. 2012 Apr 24;125(16):1979-87. doi: 10.1161/CIRCULATIONAHA.111.088591. Epub 2012 Mar 29.

Determinants of residual risk in secondary prevention patients treated with high- versus low-dose statin therapy: the Treating to New Targets (TNT) study.

Author information

  • 1Brigham and Women's Hospital, Boston, MA 02215, USA. smora@partners.org

Abstract

BACKGROUND:

Cardiovascular events occur among statin-treated patients, albeit at lower rates. Risk factors for this "residual risk" have not been studied comprehensively. We aimed to identify determinants of this risk above and beyond lipid-related risk factors.

METHODS AND RESULTS:

A total of 9251 coronary patients with low-density lipoprotein cholesterol <130 mg/dL randomized to double-blind atorvastatin 10 or 80 mg/d in the Treating to New Targets (TNT) study had complete on-treatment 1-year lipid data. Median follow-up was 4.9 years. The primary end point was major cardiovascular events (n=729): coronary death, nonfatal myocardial infarction, resuscitation after cardiac arrest, or fatal or nonfatal stroke. Multivariable determinants of increased risk were older age (adjusted hazard ratio [aHR], 1.13 per 1 SD [8.8 years]; 95% confidence interval [CI], 1.04-1.23), increased body mass index (aHR, 1.09; 95% CI, 1.02-1.17 per 4.5 kg/m(2)), male sex (aHR, 1.33; 95% CI, 1.07-1.65), hypertension (aHR, 1.38; 95% CI, 1.17-1.63), diabetes mellitus (aHR, 1.33; 95% CI, 1.11-1.60), baseline apolipoprotein B (aHR, 1.19; 95% CI, 1.11-1.28 per 19 mg/dL), and blood urea nitrogen (aHR, 1.10; 95% CI, 1.03-1.17 per 4.9 mg/dL), in addition to current smoking, prior cardiovascular disease, and calcium channel blocker use. Determinants of decreased risk were high-dose statin (aHR, 0.82; 95% CI, 0.70-0.94), aspirin use (aHR, 0.67; 95% CI, 0.56-0.81), and baseline apolipoprotein A-I (aHR, 0.91; 95% CI, 0.84-0.99 per 25 mg/dL). On-treatment 1-year lipids or apolipoproteins were not additionally associated with risk in multivariable models. Known baseline variables performed moderately well in discriminating future cases from noncases (Harrell c index=0.679).

CONCLUSIONS:

Determinants of residual risk in statin-treated secondary prevention patients included lipid-related and nonlipid factors such as baseline apolipoproteins, increased body mass index, smoking, hypertension, and diabetes mellitus. A multifaceted prevention approach should be underscored to address this risk.

CLINICAL TRIAL REGISTRATION:

URL: http://clinicaltrials.gov. Unique identifier: NCT00327691.

Comment in

PMID:
22461416
[PubMed - indexed for MEDLINE]
PMCID:
PMC3338158
Free PMC Article
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