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These databases were searched using the following keywords: “((subclavian vein) OR (inferior vena cava) OR (internal jugular vein) OR (femoral vein)) AND ((fluid responsiveness) OR volume) AND (diameter OR collapsibility OR measurement) AND (ultrasonography OR ultrasound OR sonography OR ...
Sonography of the same subjects demonstrated a positivity rate of 16.4% according to the old WHO criteria, and a positivity rate of 20.9% when the new criteria, which included the echogenic snow sign, were applied [102]. The study estimated the diagnostic sensitivity of ultrasound to be 81.6%...