Patients with High CRP and Normal LDL Have Long-Term Risk for Heart Disease, Stroke and Death
New research shows a long-term benefit in screening people for C Reactive Protein, CRP, a marker for inflammation, even if they have normal levels of bad cholesterol, because of increased long-term risk for heart attack, stroke and death.
These findings, which will be published online today in the Journal of the American College of Cardiology (JACC), demonstrate that a very simple screening, age plus CRP, can identify individuals who may benefit from statin therapy.
“This study builds on results from the landmark JUPITER trial, which showed that statins can prevent heart disease in people with normal LDL-c, or bad cholesterol, and an increased level of CRP,” said Dr. Christie Ballantyne, director of the Center for Cardiovascular Disease Prevention at the Methodist DeBakey Heart & Vascular Center and last author on the study. “We have demonstrated that the cardiovascular disease event rates persist over time, validating that the risks identified in the JUPITER trial persist for nearly seven years.”
Questions remained after the JUPITER results were announced in 2008, including whether the observed cardiovascular disease (CVD) event rates would persist with time, because JUPITER was stopped early at two years median follow-up.
“The new study analyzed patients’ risk over an average of seven years to determine that CRP is, in fact, a long-term indicator of cardiovascular risk,” said Ballantyne, who is also professor of medicine at Baylor College of Medicine. “This is important because approximately one in five men over 50 and women over 60 has a similar profile of increased CRP but normal LDL.”
About the study_Methods: After stratification into four groups based on LDL cholesterol (LDL-C) and high-sensitivity CRP (hs-CRP) levels, with cutoffs at 130 mg/dL and 2.0 mg/L respectively, incident CVD events were examined (mean follow-up 6.9 years) and compared.
Results: Of 8,907 age-eligible participants, 18.2 percent (n=1,621) were “JUPITER-eligible” (hs-CRP ≥2.0 mg/L, LDL-C <130 mg/dL) and had an absolute CVD risk of ~10.9 percent over a mean follow-up of 6.9 years (1.57 percent per year). If JUPITER hazard ratios were applied to this group, the number needed to treat to prevent one CVD event would be estimated at 38 over 5 years and 26 over 6.9 years.
Conclusion: ARIC participants with elevated hs-CRP and low LDL-C had a CVD event rate of 1.57 percent per year over 6.9 years, similar to the CVD event rate noted in the JUPITER placebo group (1.36 percent per year over 1.9 years). The association of hs-CRP ≥2.0 mg/L with increased CVD risk and mortality regardless of LDL-C provides us a simple method of using age and hs-CRP for identifying higher risk individuals.