title: Role of inferior vena cava and right ventricular diameter in assessment of volume status: a comparative study: ultrasound and hypovolemia.
abstract: OBJECTIVE
  Ultrasonography has been suggested as a useful noninvasive tool for the detection and follow-up for hypovolemia. Two possible sonographic markers as a surrogate for hypovolemia are the diameters of the inferior vena cava (dIVC) and the right ventricle (dRV). The goal of this study was to evaluate IVC and RV diameters and diameter changes in patients treated for hypovolemia and compare these findings with healthy volunteers.
  
  
  METHODS
  Fifty healthy volunteers and 50 consecutive hypovolemic patients were enrolled in the study. The dIVC, both during inspiration (IVCi) and expiration (IVCe), was measured in hypovolemic patients both before and after fluid resuscitation, and they were also measured in healthy volunteers during the time they participated in the study. The dIVC, in hypovolemic patients both before and after fluid resuscitation, was measured ultrasonographically by M-mode in the subxiphoid area. The dRV was measured ultrasonographically by B-mode in the third and fourth intercostals spaces.
  
  
  RESULTS
  The average diameters of the IVCe, IVCi, and dRV in hypovolemic patients upon arrival were significantly lower compared with healthy volunteers (P = .001). After fluid resuscitation, there was a significant increase in the mean diameters of the IVCe, IVCi, and RV in hypovolemic patients (P = .001).
  
  
  CONCLUSIONS
  The results indicate that the dIVC and dRV are consistently low in hypovolemic subjects when compared with euvolemic subjects. Bedside serial measurements of dIVC and dRV could be a useful noninvasive tool for the detection and follow-up of patients with hypovolemia and evaluation of the response to the treatment.
authors.affiliation: Department of Emergency Medicine, Gaziantep University School of Medicine, Gaziantep, Turkey. zengins76@gmail.com
authors.forename: Suat
authors.initials: S
authors.lastname: Zengin
authors.forename: Behcet
authors.initials: B
authors.lastname: Al
authors.forename: Sinan
authors.initials: S
authors.lastname: Genc
authors.forename: Cuma
authors.initials: C
authors.lastname: Yildirim
authors.forename: Süleyman
authors.initials: S
authors.lastname: Ercan
authors.forename: Mehmet
authors.initials: M
authors.lastname: Dogan
authors.forename: Gokhan
authors.initials: G
authors.lastname: Altunbas
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005260:Female; D005440:Fluid Therapy; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D020896:Hypovolemia / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000628:therapy; D008297:Male; D008875:Middle Aged; D012151:Resuscitation; D016896:Treatment Outcome; D014463:Ultrasonography; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging* / Q000503:physiopathology; D055815:Young Adult