A protein in the blood that is considered to be a key indicator of future heart disease may vary considerably among women and men, as well as blacks and whites, according to new research at UT Southwestern Medical Center.
C-reactive protein, or CRP, is released as part of the human body's inflammation response. Infections and inflammation caused by various illnesses can cause CRP levels in the blood to rise. Abnormal fatty deposits on the interior walls of arteries that are prone to rupture and cause heart attacks may also cause higher levels of CRP, which is why the protein has been touted recently as a means to determine the relative risk of heart disease in some patients.
Current recommendations for CRP testing use the same cut points to determine risk for everyone. But one size may not fit all, and there may be important differences between genders and races. A study by UT Southwestern researchers, appearing in the Journal of the American College of Cardiology, examines these differences.
"Our goal was to determine the distribution of CRP levels among different genders and races," said Dr. Amit Khera, assistant professor of internal medicine and lead author of the study. "CRP as a risk factor for cardiovascular disease has been studied mainly in white men and in research groups that do not necessarily represent the community at large. The recommended thresholds of CRP may not appropriately reflect CRP distributions for black men and women."
Researchers measured CRP levels in 2,749 men and women ages 30 to 65. They found that patients with a higher body mass index, a measurement of obesity, had correspondingly higher levels of CRP. The study also found that women typically had much higher levels of CRP in their blood than men, and blacks had higher levels of CRP than white patients. CRP levels in white women were also higher than those in black men. Black men, however, have disproportionately higher rates of cardiovascular disease than white women.