The results of studying the possibility of lung ultrasound in the diagnosis of nosocomial or community-acquired pneumonia, including those with concomitant chronic heart failure, in comparison with CT and/or chest X-ray data are presented. In patients with nosocomial pneumonia, ultrasound signs corresponding to pneumonia were detected in 80.6 % of cases, according to radiography - in 48.4 %. The structure of changes was represented by the following ultrasound profiles: C 55 %, PLAPS 20 %, A/B 20 %, B' 5 %. Community-acquired pneumonia was confirmed by lung ultrasound in 92.9 % of cases. The following ultrasound profiles were identified: PLAPS 87 %, a combination of PLAPS and A/B - 13 %. In patients with chronic heart failure with verified pneumonia, the frequency of ultrasound profiles and their combinations was: PLAPS+B 67 %, PLAPS 12 %, B' 3 %, B 8 %, PLAPS+B' 10 %. The sensitivity and specificity of lung ultrasound in the diagnosis of pneumonia against the background of concomitant heart disease was 96.8 % and 80 %, respectively. Data from the study show that lung ultrasound in the diagnosis of pneumonia is highly sensitive, and in people with chronic heart failure, as well as high specificity, is superior to radiography. © 2020 Stavropol State Medical University. All rights reserved.