title: Accuracy of precordial percussion in detecting cardiomegaly.
abstract: OBJECTIVE
  To assess the value of precordial percussion in detecting cardiomegaly, and to compare it with palpation of the apical impulse.
  
  
  METHODS
  Descriptive study.
  
  
  METHODS
  Hospitals and clinics of a university medical center.
  
  
  METHODS
  Light indirect percussion of the precordium was performed on 72 inpatients and 28 outpatients. All patients had a posteroanterior radiograph of the chest. Percussors were unaware of the clinical history and of chest roentgenogram results.
  
  
  RESULTS
  Thirty-six patients (36%) had cardiomegaly, defined as a cardiothoracic ratio of greater than 0.5 on chest roentgenogram. The cardiothoracic ratio was significantly correlated with percussion distance from the midsternal line in the left fourth (r = 0.35, p less than 0.0006), fifth (r = 0.65, p less than 0.00001), and sixth (r = 0.40, p less than 0.0001) intercostal spaces. After adjustment for clinical symptoms and systolic and diastolic blood pressures, percussion distance in the left fifth intercostal space remained a significant independent predictor of the cardiothoracic ratio. Percussion distance in the left fifth interspace discriminated cardiomegaly with a receiver-operating characteristic (ROC) area of 0.95. Percussion dullness more than 10.5 cm from the midsternal line in the left fifth interspace had a sensitivity of 94.4% (95% confidence interval [CI], 79.9% to 99.0%) and a specificity of 67.2% (CI, 54.2% to 78.1%). Distance of the apical impulse from the midsternal line discriminated with an ROC area of 0.95, but an impulse was palpated in only 40% of cases.
  
  
  CONCLUSIONS
  Percussion in the left fifth intercostal space accurately discriminates patients with and without cardiomegaly, and adds information beyond that obtainable from the history and other parts of the physical examination.
authors.affiliation: Department of Medicine, University of Illinois, Chicago 60680.
authors.forename: P S
authors.initials: PS
authors.lastname: Heckerling
authors.forename: S L
authors.initials: SL
authors.lastname: Wiener
authors.forename: V K
authors.initials: VK
authors.lastname: Moses
authors.forename: J
authors.initials: J
authors.lastname: Claudio
authors.forename: M S
authors.initials: MS
authors.lastname: Kushner
authors.forename: R
authors.initials: R
authors.lastname: Hand
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006332:Cardiomegaly / Q000175:diagnosis* / Q000453:epidemiology / Q000473:pathology; D005069:Evaluation Studies as Topic; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010173:Palpation / Q000379:methods / Q000592:standards; D010474:Percussion / Q000379:methods / Q000592:standards*; D011674:Pulse; D012680:Sensitivity and Specificity