Inter-rater reliability of sonographic measurements of the inferior vena cava.
journal contributionposted on 12.09.2013 by Turandot Saul, Resa E. Lewiss, Alexis Langsfeld, Michael S. Radeos, Marina Del Rios
Any type of content formally published in an academic journal, usually following a peer-review process.
Background: Bedside ultrasound is emerging as a useful tool in the assessment of intravascular volume status by examining measurements of the inferior vena cava (IVC). Many previous studies do not fully describe their scanning protocol. Objectives: The objective of our study is to evaluate which of three commonly reported IVC scanning methods demonstrates the best inter-rater reliability. Methods: Three physicians visualized the IVC in the three planes and utilized M-mode to measure the maximal and minimal diameter during quiet respiration. Pair-wise correlation coefficients were determined using Pearson Product Moment Correlation. Results: The most reliable pair of measurements (inspiratory and expiratory) was using the anterior mid-axillary line longitudinal view with a Kappa value for both at 0.692. Conclusion: Imaging with the anterior mid-axillary longitudinal approach using the liver as an acoustic window provides the best inter-rater reliability in measurements of the IVC. Likewise, our findings demonstrate that IVC measurements differ based on anatomic location.