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KMID : 0385920100210030341
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Journal of the Korean Society of Emergency Medicine
2010 Volume.21 No. 3 p.341 ~ p.346
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Correlation Between Sonographic Inferior Vena Cava/Aorta Diameter Index and Central Venous Pressure
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Yang Jung-Il
Ryu Seung
Lee Jin-Woong
Kim Seung-Hwan
Yoo In-Sool
You Yeon-Ho
Han Kyu-Hong
Jo Seung-Yook
Lee Seung-Han
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Abstract
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Purpose: Body fluid status of patients in an emergency room environment is a very important parameter during
clinical evaluation. In this study, we wanted to know the relationship between the diameter of the inferior vena cava and the diameter of the (IVC/Ao index) and central venous pressure (CVP) in hemodynamically unstable patients.
Methods: This study was done prospectively in an emergency medical center of a hospital from January to August, 2009. We compared the diameter of the IVC, the diameter of inferior vena cava/the body surface area index (IVC/BSA index), the IVC/Ao index, and other variables. Before and after hydration of patients with a systolic blood pressure less than 90 mmHg and who had a central venous catheter in place. Then, we calculated the correlation coefficient for ΔCVP, ΔIVC/Ao index, and other indexes.
Results: Fifty-nine patients were enrolled in the study. The mean IVC diameter before hydration was 14.3±2.7 mm; it was 15.6±2.7 mm after hydration (p<0.01). The IVC/BSA index before hydration was 8.75±1.72 and 9.55±1.79 after hydration (p<0.01). The IVC/Ao index before hydration was 1.08±0.23; it was 1.16±0.25 after hydration (p<0.01). The correlation coefficient for ΔCVP and ΔIVC was 0.37 (p<0.01); for ΔCVP vs. the ΔIVC/BSA index it was 0.37 (p<0.01); for the ΔIVC/Ao index it was 0.27 (p=0.04).
Conclusion: CVP has a higher correlation to IVC diameter and to IVC/BSA index than to the IVC/Ao index. Hence, we should estimate the IVC/Ao index and use that estimate along with other indexes to evaluate body fluid status when dealing with hemodynamically unstable patients.
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KEYWORD
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Inferior vena cava, Central venous pressure, Ultrasonography
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