Increased Adherence to Cardiac Standards of Care during Participation in Cardiac Disease Management Programs

Methods and validity indicators for measuring adherence to statins in secondary cardiovascular prevention: a systematic review

BACKGROUND

Adherence to statin therapy is crucial for reducing the recurrence of cardiovascular events. Numerous methods exist to measure medication adherence, including those based on prescription data, patient self-report, medication counting, and direct methods. It is important to determine which of these methods are appropriate for use in clinical practice. This systematic review aimed to identify the methods used to measure adherence and persistence to statins in patients undergoing cardiovascular secondary prevention and to evaluate the validity indicators of these methods.

METHODS

This systematic review included studies reporting methods to measure adherence and/or persistence to statins in cardiovascular secondary prevention. Medline, Embase, and Scopus databases were searched from inception to February 2025. Rayyan was used for the study selection and extraction data processes. Validity indicators of the adherence/persistence methods were collected; it was reported. Risk of bias of studies reporting the method validity was evaluated using the COSMIN (Consensus-based Standards for the Selection of Health Measurement Instruments) tool.

RESULTS

A total of 77 studies were included. Regarding adherence measurement, the most frequently used method was prescription refill records (n = 55) and self-report methods (n = 20). Electronic monitoring methods (n = 2), self-perceived adherence by physician (n = 1), and pill counting (n = 1) were less frequently used methods. Direct methods, using HPLC-MS/MS, were used in combination with other indirect methods (n = 5). For measuring persistence, prescription refill records were the predominant method (n = 9), while self-report methods were used in three studies, and one study used a standardized questionnaire. Several of the indirect methods have validity indicators for measuring adherence in different study populations and to different medications. Only one study provides validity indicators for the MAT questionnaire specifically adapted for statins.

CONCLUSIONS

The methods for measuring adherence to statins in secondary cardiovascular prevention were predominantly indirect, relying on prescription and supply records and self-report methods. Pill counting, electronic monitoring, and direct measurement via LC-MS/MS were less commonly used. Persistence was primarily measured through prescription refill records. None of the indirect methods was validated; thus, their use for measuring adherence to statins is not recommended. There is a need for new validated tools, incorporating a gender perspective, to measure adherence to statins in this population.

SYSTEMATIC REVIEW REGISTRATION

PROSPERO CRD42023463981.

Cost effectiveness of interventions to improve adherence to statin therapy in ASCVD patients in the United States

INTRODUCTION

Cardiovascular disease (CVD) is the leading cause of death in the United States, and high cholesterol is a leading risk factor for CVD. While statins are effective at reducing cholesterol, they are frequently underused in patients at highest risk of CVD. The objective of this study was to identify interventions which may improve adherence to statins and to assess their cost effectiveness within the US Medicare population.

METHODS

A literature review was undertaken to identify interventions to improve adherence in patients with CVD at highest risk of a recurrent event and to quantify non-adherence and the consequences of non-adherence to statins in this population. A Markov cost-utility model was developed to assess the cost effectiveness of these interventions.

RESULTS

Ten adherence interventions were identified in the literature, with 6 demonstrating statistically significant improvement in adherence. The six interventions were disease management, interactive voice response, nurse counselling, discharge letter, nurse/dietician counselling and electronic pill bottle with feedback. The model found the cost effectiveness of an intervention was highly dependent on its effectiveness and costs. Incremental cost effectiveness ratios ranged from $27,545/QALY for discharge letter with large adherence gain to $130,399/QALY for disease management program with small adherence gain.

CONCLUSION

Some interventions to improve adherence have been shown to be effective, but little attention has been paid to the costs. Further studies on adherence interventions should include economic evaluations.

Improving care after myocardial infarction using a 2-year internet-delivered intervention: the Department of Veterans Affairs myocardial infarction-plus cluster-randomized trial

BACKGROUND

Cardiovascular risk reduction in ambulatory patients who survive myocardial infarction (MI) is effective but underused. We sought to evaluate a provider-directed, Internet-delivered intervention to improve cardiovascular management for post-MI outpatients.

METHODS

The Department of Veterans Affairs (VA) MI-Plus study was a cluster-randomized trial involving 168 community-based primary care clinics and 847 providers in 26 states, the Virgin Islands, and Puerto Rico, from January 1, 2002, through December 31, 2008, with the clinic as the randomization unit. We collected administrative data for 15,847 post-MI patients and medical record data for 10,452 of these. A multicomponent, Internet-delivered intervention included quarterly educational modules, practice guidelines, monthly literature summaries, and automated e-mail reminders delivered to providers for 27 months. Main outcome measures included percentage of patients who achieved each of 7 clinical indicators, a composite score of the 7 clinical indicators, and mean low-density lipoprotein cholesterol and hemoglobin A(1c) levels.

RESULTS

Clinics had a median of 3 providers (interquartile range, 2-6), with a median of 50.0% of providers (33.3%-66.7%) participating in the study. Patients in intervention clinics had greater improvements (from 70.0% to 85.5%) in the percentages prescribed β-blockers than patients in control clinics (71.9% to 84.0%; adjusted improvement gain for intervention vs control, 2.6%; 95% CI, 0.1%-4.1%). We found nonsignificant differences in improvements favoring patients in intervention clinics for 5 of 6 remaining clinical indicators and levels of low-density lipoprotein cholesterol and hemoglobin A(1c).

CONCLUSION

A longitudinal, Internet-delivered intervention improved only 1 of 7 clinical indicators of cardiovascular management in ambulatory post-MI patients.

Assessment of the clinical outcomes and cost-effectiveness of the management of systolic heart failure in Chinese patients using a home-based intervention

This study was designed to assess the clinical effect of a home-based telephone intervention in Chinese heart failure patients. A total of 550 Chinese heart failure patients were enrolled into either (i) a group that received the usual standard of care (UC group); or (ii) a group that received a home-based heart failure centre management programme using nursing specialist-led telephone consultations (HFC group). The impact of the home-based intervention on admission rate, admission length and medical costs over 6 months was measured. Although the mean left ventricular ejection fraction in HFC patients was 29.3% compared with 34.8% in UC patients, the home-based intervention resulted in a significantly lower all-cause admission rate per person (HFC 0.60 +/- 0.77 times/person; UC 0.96 +/- 0.85 times/person), a shorter all-cause hospital stay (reduced by 8 days per person) and lower total 6-month medical costs (reduced by US$2682 per patient). These results suggest that the home-based intervention with nursing specialist-led telephone consultations may improve the clinical outcome and provide cost-savings for Chinese patients with heart failure.