Pharmacist Intervention to Improve Medication Adherence in Patients with Acute Coronary Syndrome: The PRIMA-ACS Study

Despite ample evidence of benefit, adherence to secondary prevention medication therapy after acute coronary syndrome (ACS) is often suboptimal. Hospital pharmacists are uniquely positioned to improve adherence by providing medication education at discharge.

To determine whether a standardized counselling intervention at hospital discharge significantly improved patients' adherence to cardiovascular medications following ACS.

This single-centre, prospective, nonrandomized comparative study enrolled patients with a primary diagnosis of ACS (January 2014 to July 2015). Patients who received standardized discharge counselling from a clinical pharmacist were compared with patients who did not receive counselling. At 30 days and 1 year after discharge, follow-up patient surveys were conducted and community pharmacy refill data were obtained. Adherence was assessed using pharmacy refill data and patient self-reporting for 5 targeted medications: acetylsalicylic acid, P2Y purinoceptor 12 (P2Y12) inhibitors, angiotensin-converting enzyme inhibitors or angiotensin II receptor blockers, β-blockers, and statins. Thirty-day and 1-year medication utilization, cardiovascular readmission rates, and all-cause mortality were also assessed.

Of the 259 patients enrolled, 88 (34.0%) received discharge counselling. Medication data were obtained for 253 patients (97.7%) at 30 days and 242 patients (93.4%) at 1 year. At 1 year after discharge, there were no statistically significant differences between patients who did and did not receive counselling in terms of rates of nonadherence (11.9% versus 18.4%, p = 0.19), cardiovascular readmission (17.6% versus 22.3%, p = 0.42), and all-cause mortality (3.4% versus 4.2%, p > 0.99). Overall medication nonadherence was 2.8% (7/253) at 30 days and 16.1% (39/242) at 1 year.

Discharge medication counselling provided by hospital pharmacists after ACS was not associated with significantly better medication adherence at 1 year. Higher-quality evidence is needed to determine the most effective and practical interventions to ensure that patients adhere to their medication regimens and achieve positive outcomes after ACS.