A Patient-Spouse Intervention for Self-Managing High Cholesterol (CouPLES)

Background: Background/Rationale: Coronary heart disease (CHD) is the leading cause of death in the United States, resulting in more than 500,000 heart attacks and another 500,00 deaths per year. More than 80% of veterans have > 2 risk factors for CHD, underscoring the need for intervention. One major modifiable risk factor for CHD is elevated low-density lipoprotein cholesterol (LDL-C). Despite the proven success of diet, exercise, and medication, LDL-C frequently is not at the optimum level, due in part to patient nonadherence. Therefore, interventions are needed to increase adherence, thereby lowering LDL-C.

Objectives: Objectives: We examined the effect of a patient-spouse intervention to lower LDL-C by increasing patient treatment adherence. The primary hypothesis was that patients enrolled in a telephone-based, spouse-assisted intervention will experience a clinically meaningful 7% reduction in LDL-C. The secondary hypotheses were that patients who receive the intervention would show a significant increase in adherence to medication, diet, and exercise.

Methods: In a 3-year study, a randomized controlled trial compared a 10-month, telephone-based, spouse-assisted intervention to usual care. Married patients with above-goal LDL-C and their spouses were consented, completed a baseline assessment, and then were randomly assigned to the intervention or usual care arm. Month 1 involved an educational call delivered to patients and spouses. Months 2-10 (except month 6) involved monthly goal setting calls delivered to patients and calls focused on increasing social support to spouses. The patient phone call will always preceded the spouse phone call. At 6 and 11 months, LDL-C and adherence were re-assessed. The primary outcome was LDL-C measured three times (baseline, 6 months, 11 months); secondary outcomes were adherence to medication, diet, and exercise, also assessed at baseline, 6 months, and 11 months. Descriptive statistics were computed for all study variables within each study arm. Mixed effects models were used to evaluate the intervention's effect on the primary and secondary outcomes at 11 months. We also calculated intervention cost.

Status: Enrollment began in Fall, 2007 and was completed in July of 2009.

Impact: Elevated LDL-C is a major risk factor for CHD, stroke, and peripheral vascular disease, all of which are common among veterans. The expected increase in prevalence of CHD over the next several decades will result in an increased burden for both veterans and the VA health care system. Despite the known risk of hypercholesterolemia, many veterans have suboptimal LDL-C levels. As the latest evidence and recommendations suggest that these goals should be even lower, interventions to assist patients to lower LDL-C increasingly will be needed. The VA considers the reduction of LDL-C an important goal, as indicated by the major effort of the Ischemic Heart Disease Quality Enhancement Research Initiatives (QUERI). This study is important because (1) it addresses a highly prevalent risk factor for CHD among veterans; (2) it proposes a potentially low-cost method for improving LDL-C levels, which in turn could reduce VA healthcare costs; (3) the intervention is practical and could be disseminated easily in the VA healthcare system if proven effective; and (4) this intervention provides a model for self-management of other chronic diseases, such as diabetes and hypertension.