Explaining the fall in Coronary Heart Disease mortality in the Republic of Ireland between 2000 and 2015 - IMPACT modelling study

•Coronary Heart Disease (CHD) death rates halved between 2000 and 2015 in Ireland.•4060 fewer CHD deaths were observed in 2015 than expected.•CHD risk factor improvements contributed to ~30% of the CHD mortality decline.•Improved uptakes in cardiology treatments explained ~60% of the CHD decline.•Population health gains were reversed due to increase in BMI, diabetes and physical inactivity levels.