Sonographic assessment of infrarenal inferior vena caval dimensions.

Abstract

The dimensions of the infrarenal inferior vena cava during quiet respiration, single leg lifting, and breath-holding were assessed using sonography in 156 patients. Sonographic assessment of infrarenal inferior vena caval dimensions was feasible in 69% of patients. Measurements during breath-holding were significantly greater than during quiet respiration (P < 0.001) and leg lifting (P < 0.005), although in approximately one quarter of the patients the mean calculated diameter was greatest during quiet respiration. we conclude that sonographic assessment of infrarenal inferior vena caval dimensions is feasible, but it should be performed during quiet respiration and breath-holding to allow for variation with different respiratory maneuvers.

Experimental study and constitutive modelling of the passive mechanical properties of the ovine infrarenal vena cava tissue

“…3), in agreement with the longer infrarenal in situ axial stretch measured. The deformation ranges were also different for specimens in circumferential and longitudinal directions, which is a direct consequence of their physiological role that demands a higher extensibility in the longitudinal direction in order to bear stretches resulting from breath and accidental loads, such as the Valsalva manoeuvre (see, e.g., Sykes et al, 1995). Intra-individual dispersion presented an average CV of 0.29 and 0.32 [-] in longitudinal and circumferential directions, respectively (Schulze-Bauer et al, 2003;Gusic et al, 2005), whereas average CV values of 0.75 and 0.35 [-] were obtained for inter-individual comparisons.…”

“…For monotonic tests, Fig. 1, samples were stretched until failure at a strain rate of 15 mm/min in accordance with a load rate as that caused by the breathing cycle (Sykes et al, 1995).…”

Ultrasound Evaluation of the Hepato–Portal System

“…Although the latter anomaly is rare in the United States, it is the most common cause of obstruction to hepatic venous outfl ow known worldwide. [1][2][3] The hepatic veins are the largest visceral branches of the IVC. They originate within the liver, receiving blood from the portal vein and the hepatic artery.…”

Ultrasound Evaluation of the Hepato–Portal System

“…Although the latter anomaly is rare in the United States, it is the most common cause of obstruction to hepatic venous outflow known worldwide. 1–3…”