title: Bedside assessment of central venous pressure by sonographic measurement of right ventricular outflow-tract fractional shortening.
abstract: OBJECTIVE
  We aimed to assess the suitability of right ventricular outflow tract (RVOT) fractional shortening for estimating low central venous pressure (CVP). To the best of our knowledge, there have been no similar studies in the English language literature.
  
  
  METHODS
  In this cross-sectional study, the emergency physicians measured the RVOT fractional shortening on parasternal short-axis view. A receiver operating characteristic curve analysis was conducted to identify the threshold that maximized the sensitivity and specificity for discriminating normal and low CVPs by the RVOT fractional shortening value. The sensitivity, specificity, and the positive and the negative likelihood ratios of RVOT fractional shortening to truly estimate CVP were calculated.
  
  
  RESULTS
  Fifty-eight consecutive patients had invasive CVP monitoring. Nine patients with high CVP and eight for other reasons were excluded. Forty-one patients were enrolled in the study, of whom 21 were in low CVP group and 20 were in normal CVP group. RVOT diastolic diameters, RVOT systolic diameters, and RVOT fractional shortening were lower in low CVP group and this difference was statistically significant (P<0.001). The cutoff value for RVOT fractional shortening to differentiate the low and normal CVPs using the highest sensitivity and specificity was 26.44%. Area under the receiver operating characteristic curve was 0.933 (0.810-0.987) with a P value of less than 0.001. The sensitivity and specificity of RVOT fractional shortening to truly estimate CVP were 95 (75-99) and 80% (58-94), respectively.
  
  
  CONCLUSIONS
  In the hands of emergency physicians, a RVOT fractional shortening measurement is a good predictor of low CVP.
authors.affiliation: Izmir Ataturk Research and Training Hospital, Izmir, Turkey. erolerdenun@yahoo.com
authors.forename: Erol Erden
authors.initials: EE
authors.lastname: Ünlüer
authors.forename: Özcan
authors.initials: Ö
authors.lastname: Yavaşi
authors.forename: Haldun
authors.initials: H
authors.lastname: Akoğlu
authors.forename: Hanife Pinar
authors.initials: HP
authors.lastname: Kara
authors.forename: Serdar
authors.initials: S
authors.lastname: Bayata
authors.forename: Ismail
authors.initials: I
authors.lastname: Yürekli
authors.forename: Levent
authors.initials: L
authors.lastname: Yilik
authors.forename: Ali
authors.initials: A
authors.lastname: Gürbüz
mesh_terms: D002496:Central Venous Pressure; D003430:Cross-Sectional Studies; D004452:Echocardiography / Q000379:methods; D004636:Emergency Service, Hospital; D006352:Heart Ventricles / Q000033:anatomy & histology; D006801:Humans; D020896:Hypovolemia / Q000000981:diagnostic imaging / Q000503:physiopathology; D019095:Point-of-Care Systems; D012372:ROC Curve; D012680:Sensitivity and Specificity; D016278:Ventricular Function, Right / Q000502:physiology; D014694:Ventricular Outflow Obstruction / Q000000981:diagnostic imaging* / Q000503:physiopathology