小儿先心病或其他大手术麻醉中常经皮通过上腔静脉作中心静脉置管(Central venous catheterization,CVC)。正确的CVC位置是导管尖端位于上腔静脉内、与血管壁平行、且在右房水平之上。如果CVC位置不正确可能引起心律失常、药液外渗、血栓形成、CVP读数不正确甚至引起右房或上腔静脉突孔、心脏填塞等。由于CVC的位置通常于术后做胸片检查是才能准确判定,所以穿刺行中心静脉置管时即确定适宜的CVC长度是很必要的。作者通过系列研究小儿CVC的位 Pediatric congenital heart disease or other major surgical anesthesia often through the superior vena cava for central venous catheterization (Central venous catheterization, CVC). The correct CVC position is that the catheter tip is located in the superior vena cava, parallel to the vessel wall, and above the level of the right atrium. If the CVC position is incorrect, it may cause arrhythmia, liquid extravasation, thrombosis, incorrect CVP readings, and even cause right atrium or superior vena cava puncture, heart blockage, and the like. Because the location of the CVC is usually postoperative chest X-ray examination can be accurately judged, so the puncture of the central venous catheter to determine the appropriate CVC length is necessary. The authors studied a series of pediatric CVC bits