Nguyen T, et al. - The relationship between physician adherence to prescribing guideline-recommended medications amid hospitalisation and 6-month major adverse outcomes of patients with acute coronary syndrome in Vietnam was ascertained in this study. In-hospital guideline adherence was related to a significant decrease in major adverse outcomes up to 6 months after discharge. It supports the requirement for improving adherence to guidelines in hospital practice in low-income and middle-income countries like Vietnam.