Correlation between inferior vena cava diameter and central venous pressure in critically ill patients

Weerapan Wiwatworapan, Nuchapa Ratanajaratroj, Buncha Sookananchai
Journal of the Medical Association of Thailand, Chotmaihet Thangphaet 2012, 95 (3): 320-4

BACKGROUND: The inferior vena cava (IVC) diameter is often used to estimate central venous pressure (CVP); however, the correlation and the cutoff of IVC compared with CVP have not yet been described in a Thai-population.

MATERIAL AND METHOD: A cross-sectional study evaluated the critically ill patients in the medical intensive care unit who had a central venous catheter inserted. The correlation between CVP and IVC diameter measured by a 2-dimensional, long-axis subxiphoid view at the end-expiratory phase with bedside ultrasonography were evaluated.

RESULTS: Forty-seven patients with a mean age of 60 +/- 16 years (range, 18 to 91) were studied. Correlation (r) between end-expiration IVC diameter and CVP was 0.75 (95% CI 0.59-0.85; p < 0.0001). An IVC diameter of < or = 10 mm predicted CVP of 10 cmH2O (sensitivity 77% and specificity 91%) and IVC diameter of > or = 15 mm predicted CVP of 15 cmH2O (sensitivity 90% and specificity 89%).

CONCLUSION: The present study indicate that the measurement of the IVC diameter has a good correlation with CVP in Thai-population and useful for assessment of the volume status. The measurement of the IVC by ultrasonography may be an important additional evaluation of critically ill patients.

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