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Table 4 Estimation of RA pressure based on Inferior Vena Cava diameter and collapse

From: WEB downloadable software for training in cardiovascular hemodynamics in the (3-D) stress echo lab

Inferior vena cava diameter (cm) Respiratory collapse (%) RAP (mmHg)
< 2.1 ≥ 50% 3 (0-5)
> 2.1 < 50% 15
> 2.1 ≥ 50% 8 (5-10)
< 2.1 < 50% 8 (5-10)
  1. RAP = Right atrium pressure