Ultrasound evaluation of IVC

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  • Patient is positioned supine
  • Longitudinal: landmark is the liver
  • Transverse: landmark is the spine
  • Positive when
    • Collapse >30% with inspiration
    • IVC <1.2cm diameter
    • IVC:aorta ratio < 0.8 in paeds
  • Negative when
    • No collapse with inspiration
    • IVC >2cm diameter
    • IVC:aorta ratio > 1.0 in paeds
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