title: Accuracy of percussion of the left cardiac border.
abstract: The purpose of this study was to determine the accuracy of percussion of the left cardiac border. Sixty-six adult patients were studied. The left cardiac border as determined by percussion and marked with a calibrated lead marker was compared with that obtained by a chest X-ray. The error in locating the left cardiac border by percussion ranged from underestimating by 5.0 cm to overestimating by 5.5 cm. The mean absolute error was 1.6 cm (SD = 1.6 cm). In 74% (49/66) and 85% (56/66) of the patients the percussed border was within 1.0 and 2.0 cm, respectively, of that established by X-ray. In 24 of the 66 cases, a second examiner also independently percussed the left cardiac border. The differences between the location determined by the two observers ranged from 0 to 4 cm with a mean difference of 1.2 cm (SD = 1.0 cm).
  
  
  CONCLUSIONS
  Percussion can accurately locate the left cardiac border in the adult patient and is a reproducible technique.
authors: Department of Medicine, Veterans Affairs Medical Center, Omaha, NE 68105.
authors: J N
authors: JN
authors: Karnegis
authors: N
authors: N
authors: Kadri
mesh_terms: D000328:Adult; D015982:Bias; D006332:Cardiomegaly / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D010474:Percussion / Q000379:methods / Q000592:standards*; D011859:Radiography; D015203:Reproducibility of Results