Upgraded community health services, including checkups by phone or in person with a local nurse practitioner at a neighborhood clinic, and free charge cards for medications are almost nine times more likely to benefit black Americans at greater risk of heart disease than full-service physician care alone.
The analysis by researchers at Johns Hopkins, to be published in the journal Circulation online March 16, is the first to test which model works best when patients have equal and unrestricted access to health care services.
"Despite physicians' best attempts, current treatment programs have not contained the disproportionately higher number of black Americans, especially women, who have the leading risk factors for coronary heart disease, including high blood pressure, elevated levels of cholesterol, high rates of smoking and diabetes, and a sedentary lifestyle," says lead investigator Diane Becker, M.P.H., Sc.D., a professor at The Johns Hopkins University School of Medicine and Bloomberg School of Public Health. "Our results show that direct involvement from a nurse practitioner and a community health worker is far more effective at helping patients lower their risk factors than the standard in which patients are on their own to follow - or not follow - their doctors' orders."
The Hopkins findings offer an effective strategy for reducing racial disparities in health status, which is quite pronounced in heart disease, the researchers say. Whites have the lowest rate of premature deaths from heart disease of all racial groups in the United States, at 14.7 percent of deaths before age 65, while blacks have among the highest, at 31.5 percent. According to the latest statistics from the American Heart Association, in 2002, 50,000 blacks died from coronary heart disease, which affects 7.4 percent of black men and 7.5 percent of black women, roughly five times the rates in the general population.
According to Becker, the study's results challenge conventional wisdom that resource inequities, such as limited access to medical services, or lack of affordable medications, educational resources and culturally appropriate health care, are the root of the racial disparities in health status in the United States.
For one year, the researchers analyzed how well patients followed their physicians' advice by tracking regular visits, changes in lifestyle routines, use of medications and health outcomes in more than 350 black American adults between the ages of 30 and 59. Study participants had no known history of heart problems, but all of them had at least one fixable major risk factor for coronary artery disease. Every participant had at least one sibling with premature coronary heart disease (such as blocked arteries) that had required hospitalization, so family history was a risk factor.
Blood tests and physical exams were conducted at the beginning and end of the study to assess changes in each individual's risk factors. The researchers also used the Framingham Risk Score, an estimate of the likelihood of developing major heart problems, such as a heart attack, within 10 years.
Roughly half (196) of the participants were provided with community-based care and the rest (168) were provided with enhanced primary care. Participants from the same family were assigned to the same care group. In the community care group, participants continued their regular checkups with their physician, but all services and care for heart disease risk factors were provided by a nurse practitioner or a community health worker.
For example, a patient in the primary care group, who needed to lower her blood pressure and required regular checkups, first had to schedule an appointment with her physician. If that patient wanted to quit smoking, her physician would mail out information about local quit-smoking programs. A patient in the community care group, however, was taught how to measure and control her own blood pressure, given one-on-one advice on how to quit smoking, and received follow-up calls from a nurse practitioner or community health worker.
All participants in both groups had access to free medication in the form of a charge card good at the local pharmacy. Free access to risk-factor-reduction programs and health services, including educational materials and seminars, diet and exercise programs, and smoking cessation classes, was afforded to both groups. The primary care group received coupons for free local YMCA exercise programs, and the community care group could attend classes in water aerobics, line dancing and basketball led by a community health worker.
Throughout the study, all decisions about risk-factor reduction and care by the nurse practitioner were checked twice monthly with a physician. For issues unrelated to risk-factor reduction, the patients continued to see their physician or a specialist as required.
Results showed that both groups significantly reduced their overall risk of developing coronary heart disease, but the community care group did significantly better than the enhanced primary care group for overall risk, blood pressure control and reducing cholesterol levels.
Overall Framingham Risk Scores decreased 26 percent and 3 percent, respectively. Blood pressure control was better in the community group, at 60 percent, compared to 40 percent for the primary care group at the end of the study. (On average, only 30 percent of blacks have controlled blood pressure.)