title: A Non-invasive Method for Assessment of Intravascular Fluid Status: Inferior Vena Cava Diameters and Collapsibility Index.
abstract: OBJECTIVE
  To evaluate the correlation between central venous pressure (CVP) and inferior vena cava (IVC) diameters measured by ultrasonography (Ultrasound) in critically ill patients.
  
  
  METHODS
  Intubated critically ill patients were enrolled. The CVP values were measured using a U-tube manometer and were compared to the IVC diameters and collapsibility index, which were measured by bedside Ultrasound. Patients younger than 18 years old, who were not intubated, who had an abdominal pressure greater than 12 mmHg, and/or who were admitted for trauma were excluded from the study.
  
  
  RESULTS
  Eighty three patients with a mean age of 73.6±11.2 years were enrolled. The most common diagnosis was sepsis (21 patients, 25.30%). IVC inspiration measurements were statistically significantly correlated with CVP measurements (p0.05, r: 0.1). IVC collapsibility measurements showed a negative correlation with CVP measurements (p<0.01, r: 0.68).
  
  
  CONCLUSIONS
  There is a strong correlation between CVP and IVC diameters and the collapsibility index. This is a new formula for evaluating CVP, based on our statistical analyses.
authors.affiliation: Sinan Karacabey, Assistant Professor, Emergency Department, Bozok University Faculty of Medicine, Yozgat, Turkey.
authors.forename: Sinan
authors.initials: S
authors.lastname: Karacabey
authors.affiliation: Erkman Sanri, MD. Emergency Medicine Department, Marmara University, Faculty of Medicine, Pendik Training and Research Hospital, Istanbul, Turkey.
authors.forename: Erkman
authors.initials: E
authors.lastname: Sanri
authors.affiliation: Ozlem Guneysel Associate Professor, Emergency Department, Kartal Dr Lutfi Kırdar Training and Research Hosital, Istanbul, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Guneysel
keywords: End-tidal capnography; Intubation; Ultrasonography