Department of Pediatrics, Section of Neonatology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
Department of Pediatrics, Section of Neonatology, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
J Perinatol. 2020 Apr;40(4):567-572. doi: 10.1038/s41372-019-0456-0. Epub 2019 Aug 5.
To determine if umbilical venous catheter (UVC) insertion depth estimated by surface measurement (SM) results in optimal catheter tip position on ultrasound as compared with formula using birth weight (BW).
In this randomized controlled trial, eligible infants were randomized to UVC insertion depth estimated by SM or BW method. We compared proportion of optimum UVC position on ultrasound read by neonatologist masked with group assignment.
UVC was inserted to estimated depth in 164 of 200 enroled infants. There was no difference in the proportion of correctly positioned UVCs between the groups (SM 33/82 (40.2%) vs BW 27/82 (32.9%), p = 0.33). Among BW < 1000 g, SM method had higher correctly positioned UVC (43.7% vs 22.5%, p = 0.07).
There was no difference in the rate of optimally positioned UVC tip between the two methods for estimating UVC insertion depth. However, SM method results in more optimal positioning of UVC tip among BW < 1000 g infants.
比较体表测量法（SM）和体重公式法预测的脐静脉导管（UVC）插入深度，以确定哪种方法能使 UVC 尖端在超声下的位置达到最佳。
本随机对照试验将符合条件的婴儿随机分为体表测量法或体重公式法组，以确定 UVC 插入深度。由一位对分组情况设盲的新生儿科医生来比较两组中 UVC 超声最佳位置的比例。
200 名入组婴儿中，有 164 名婴儿按估计深度插入 UVC。两组中 UVC 位置正确的比例无差异（体表测量法 33/82（40.2%）vs 体重公式法 27/82（32.9%），p=0.33）。在体重<1000g 的婴儿中，体表测量法的 UVC 位置更正确（43.7% vs 22.5%，p=0.07）。
两种方法预测 UVC 插入深度时，UVC 尖端最佳位置的比例没有差异。然而，在体重<1000g 的婴儿中，体表测量法可使 UVC 尖端的位置更优。
