title: Right internal jugular vein distensibility appears to be a surrogate marker for inferior vena cava vein distensibility for evaluating fluid responsiveness.
abstract: OBJECTIVE
  To investigate whether the respiratory variation of the inferior vena cava diameter (∆DIVC) and right internal jugular vein diameter (∆DRIJ) are correlated in mechanically ventilated patients.
  
  
  METHODS
  This study was a prospective clinical analysis in an intensive care unit at a university hospital. Thirty-nine mechanically ventilated patients with hemodynamic instability were included. ∆DIVC and ∆DRIJ were assessed by echography. Vein distensibility was calculated as the ratio of (A) Dmax--Dmin/Dmin and (B) Dmax--Dmin/ mean of Dmax--Dmin and expressed as a percentage.
  
  
  RESULTS
  ∆DIVC and ∆DRIJ were correlated by both methods: (A) r = 0.34, p = 0.04 and (B) r = 0.51, p = 0.001. Using 18% for ∆DIVC, indicating fluid responsiveness by method (A), 16 patients were responders and 35 measurements showed agreement (weighted Kappa = 0.80). The area under the ROC curve was 0.951 (95%CI 0.830 - 0.993; cutoff = 18.92). Using 12% for ∆DIVC, indicating fluid responsiveness by method (B), 14 patients were responders and 32 measurements showed agreement (weighted Kappa = 0.65). The area under the ROC curve was 0.903 (95%CI 0.765 - 0.973; cut-off value = 11.86).
  
  
  CONCLUSIONS
  The respiratory variation of the inferior vena cava and the right internal jugular veins are correlated and showed significant agreement. Evaluation of right internal jugular vein distensibility appears to be a surrogate marker for inferior vena cava vein distensibility for evaluating fluid responsiveness.
authors.affiliation: Unidade de Terapia Intensiva Central, Complexo Hospitalar Santa Casa, Porto Alegre, RS, BR.
authors.forename: Fabiano
authors.initials: F
authors.lastname: Broilo
authors.affiliation: Unidade de Terapia Intensiva Central, Complexo Hospitalar Santa Casa, Porto Alegre, RS, BR.
authors.forename: Andre
authors.initials: A
authors.lastname: Meregalli
authors.affiliation: Programa de Pós-Graduação em Ciências Pneumológicas, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, BR.
authors.forename: Gilberto
authors.initials: G
authors.lastname: Friedman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015415:Biomarkers / Q000378:metabolism; D005260:Female; D005440:Fluid Therapy / Q000379:methods*; D006801:Humans; D007362:Intensive Care Units; D007601:Jugular Veins / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012121:Respiration, Artificial; D014682:Vena Cava, Inferior / Q000378:metabolism*
chemical_list: D015415:Biomarkers