Aim. To find out the relationship between the awareness level of clinical guidelines on heart failure (HF) with reduced ejection fraction and a number of professional characteristics (specialty, work experience, self-assessment of awareness level, attitude towards the use of guidelines, the main way of document study). To improve the efficiency and development of the postgraduate education system, the factors that influence doctors' awareness of guidelines should be determined. Material and methods. The study included the results of an anonymous survey of 207 doctors (155 cardiologists, 44 therapists, 8 doctors of other specialties). To assess the significance of differences, Student's t-test, χ2-test and Fisher's exact test were used. Results. The mean number of correct answers to the questionnaire among cardiologists was significantly higher than among general practitioners (p