Difference between revisions of "IVC ultrasound"
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==Measurements== | ==Measurements== | ||
| − | + | ===Correlations Between IVC Size and CVP<ref>Goldflam K, et al. Focus on: Inferior vena cava ultrasound. ACEP News. June 2011.</ref>=== | |
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| − | + | ! IVC (cm) !! Respiratory Change !! CVP (cm H2O) | |
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| − | | | + | | <1.5 || Total collapse || 0-5 |
| − | | | ||
| − | | 0-5 | ||
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| − | | 1.5-2. | + | | 1.5-2.5 || >50% collapse || 6-10 |
| − | | | ||
| − | | | ||
|- | |- | ||
| − | | 1.5-2. | + | | 1.5-2.5 || <50% collapse || 11-15 |
| − | | | ||
| − | | | ||
|- | |- | ||
| − | | | + | | >2.5 || <50% collapse || 16-20 |
| − | | | + | |- |
| − | | | + | | >2.5 || No change || >20 |
|} | |} | ||
| − | + | ''Measure 2cm from IVC/RA junction or 1cm from IVC/hepatic vein junction'' | |
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== See Also == | == See Also == | ||
Revision as of 15:07, 7 March 2015
Contents
Background
- Though contriversal, IVC measurement by ultrasound can estimate volume status and fluid responsiveness
- Measure both absolute diameter of IVC and percent collapse during inspiration of spontaneously breathing patients
- Can use as a dynamic assessment after intervention (giving fluids)
- Unclear if applicable to intubated patients
Technique
- Use curvilinear (abdominal) probe or phased array (cardiac) probe
- In subxyphoid cardiac view (epigastric), fan probe laterally to view the IVC draining into the right atrium
- may start with subxyphoid view, place right atrium in center of screen and rotate probe 90 degrees clockwise to find IVC
- Use M-mode to measure IVC collapse during inspiration or estimation can be made in 2D with IVC in longitudinal axis
Measurements
Correlations Between IVC Size and CVP[3]
| IVC (cm) | Respiratory Change | CVP (cm H2O) |
|---|---|---|
| <1.5 | Total collapse | 0-5 |
| 1.5-2.5 | >50% collapse | 6-10 |
| 1.5-2.5 | <50% collapse | 11-15 |
| >2.5 | <50% collapse | 16-20 |
| >2.5 | No change | >20 |
Measure 2cm from IVC/RA junction or 1cm from IVC/hepatic vein junction
See Also
References
Dawson, M. Mallin, M. Introduction To Bedside Ultrasound: Volumes 1 and 2.Emergency Ultrasound Solutions. 2012 Inkling File
- ↑ Dipti A, et al. Role of inferior vena cava diameter in assessment of volume status: a meta-analysis. AJEM. 2012; 30:1414-1419.
- ↑ Zhang Z, et al. Ultrasonographic measurement of the respiratory variation in the inferior vena cava diameter is predictive of fluid responsiveness in critically ill patients: systematic review and meta-analysis. Ultrasound Med Biol. 2014. May; 40(5):845-53.
- ↑ Goldflam K, et al. Focus on: Inferior vena cava ultrasound. ACEP News. June 2011.