Adherence to recommendations for secondary prevention medications after myocardial infarction in Estonia – comparison of real-world data from 2004-2005 and 2017-2018

Background: Relatively high rates of adherence to myocardial infarction (MI) secondary prevention medications have been reported, but register-based, objective real-world data is scarce.We aimed to analyse adherence to guideline-recommended medications for secondary prevention of MI in 2017-2018 (period II) and compare the results with data from 2004-2005 (period I) in Estonia.Methods: Study populations were formed based on data from the Estonian Health Insurance Fund's database and on Estonian Myocardial Infarction Register. By linking to the Estonian Medical Prescription Centre database adherence to guideline-recommended medications for MI secondary prevention was assessed for one year follow-up period from the first hospitalization due to MI. Data was analysed using the defined daily dosages methodology. Results: Total of 6694 and 6060 cases of MI were reported in periods I and II, respectively. At least one prescription during the follow up period was found for beta-blockers (BB) in 81.0 % and 83.5 % (p = 0.001), for angiotensin converting enzyme inhibitor/angiotensin II receptor blocker (ACEi/ARB) in 76.9 % and 66.0 % (p < 0.001), and for statins in 44.0 % and 67.0 % (p < 0.001) of patients in period I and II, respectively. P2Y12 inhibitors were used by 76.4 % of patients in period II. The logistic regression analysis adjusted to gender and age revealed that some drugs and drug combinations were not allocated similarly in different age and gender groups. Conclusions: In Estonia, adherence to MI secondary prevention guideline-recommended medications has improved. But as adherence is still not ideal more attention should be drawn to MI secondary prevention through systematic guideline implementation.