Wiwatworapan Weerapan, Ratanajaratroj Nuchapa, Sookananchai Buncha
Department of Medicine, Maharat Nakhon Ratchasima Hospital, Nakhon Ratchasima, Thailand.
J Med Assoc Thai. 2012 Mar;95(3):320-4.
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.
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.
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%).
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.
下腔静脉（IVC）直径常被用于估计中心静脉压（CVP）；然而，在泰国人群中，IVC与CVP之间的相关性及临界值尚未见报道。
一项横断面研究评估了在医学重症监护病房中插入中心静脉导管的重症患者。通过床旁超声检查，在呼气末阶段采用二维剑突下长轴视图测量CVP与IVC直径之间的相关性。
研究了47例平均年龄为60±16岁（范围18至91岁）的患者。呼气末IVC直径与CVP之间的相关性（r）为0.75（95%CI 0.59 - 0.85；p < 0.0001）。IVC直径≤10 mm预测CVP为10 cmH₂O（敏感性77%，特异性91%）；IVC直径≥15 mm预测CVP为15 cmH₂O（敏感性90%，特异性89%）。
本研究表明，在泰国人群中，IVC直径测量与CVP具有良好的相关性，对评估容量状态有用。超声测量IVC可能是对重症患者进行重要的额外评估方法。
