Description
Echo assessment of right atrial pressure (RAP), based on anteroposterior diameter (APD) of inferior vena cava (IVC) and IVC collapsibility with sniff maneuver, often does not corelate with clinical or invasive assessment of volume status. We hypothesize, translation of the plane of insonation during sniff maneuver could lead to overestimation or underestimation of IVC collapsibility by M mode. A 3D approach could evaluate IVC collapsibility better.
Subject
Measurements of IVC (1-2 cm from Cavoatrial junction) were obtained in 34 patients using 2D and M mode as well as 3D Echo. Using multiplanar reconstruction, true short axis views of the IVC were obtained at the level of IVC measurement in 2D and M mode. APD was measured in M mode and 3D, at baseline and during sniff maneuver.