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maximum size > 2.1 cm collapses >50% during sniff = 5–10 mm Hg.

maximum size 50% during sniff = right atrial pressure 0–5 mm Hg.It has more recently been integrated into several critical care/emergency ultrasound protocols as a non-invasive estimate of central venous pressure (CVP).Ĭonsiderable heterogeneity exists among authors regarding the exact relationship between Right atrial pressure and the behavior of the IVC the American Society of Echocardiography recommends that the following specific values be used when guiding interventions: Ultrasonographic measurement of inferior vena cava (IVC) diameter and degree of respirophasic collapse was initially utilized by nephrologists and subsequently cardiologists.